"This kind of [Mithril] can be used in a large number of aviation fields, and its proportion is only 1. 38 Ah, only half of the aluminum alloy, if all this metal is used instead of aluminum alloy, then the weight of our aircraft fuselage can be reduced by almost half. That's great!" said one of the engineers excitedly.

"yes, you're right. But you get what you pay for, and the fuselage of this plane costs more than three times as much......," said a companion who is sensitive to numbers.

"That's worth it, because most of the cost of our aircraft is the engine and electronic systems, and the fuselage accounts for less than half of the total price. If you do it, it's twice as expensive as before......"

"However, now I heard that this [Mithril] is not high, and even if it is necessary to completely replace aluminum alloy, it will not be possible to do it quickly. ”

Aviation materials are very sensitive to importance, the lighter the better, the relatively cheap aluminum alloy is very suitable, but its high temperature strength is not good. Titanium alloy has high strength at high temperatures, but the specific gravity is still a little larger, and it is too expensive. If the speed does not exceed 2. Mach 5, using titanium alloy is too luxurious. The aluminum alloy used in aviation is generally an aluminum-magnesium alloy (Dura aluminum), and in the 80s, a lighter aluminum-lithium alloy was invented. Aluminum-lithium alloy is lighter than aluminum-magnesium alloy, and the strength is not bad, but lithium is more expensive, so aluminum-lithium alloy cannot be used in large quantities.

The magnesium-sodium alloy is different, these two metals are relatively large minerals, rich in resources, do not have to worry about the source of raw materials. However, these two metals are chemically quite reactive, and the magnesium strip burning test is a junior high school chemistry class. Sodium metal is even more powerful, its specific gravity is smaller than water, and it will burn when it touches water, generating extremely corrosive sodium hydroxide, which will also absorb water vapor in the air and spontaneously combust. The average person wouldn't have hit the idea of these two metals.

In the history of the original time and space, a nuclear physics laboratory that first developed magnesium-sodium alloys was not for any aviation materials, but for new reactor coolants. After experimenting with the proportions of various formulations, they stumbled upon the use of a suitable ratio and stabilizing additives, and actually obtained a stable magnesium-sodium alloy, a stable metal that does not spontaneously ignite in air and water. However, this kind of thing has a relatively high melting point and is not suitable for use as a reactor coolant, but its solid state is very soft, so it is useless. Its greatest use is as a catalyst for certain reactions and as a sealing material for equipment.

A few decades later, however, its fortunes took a turn and a new type of process emerged, radiation. The discovery of its new use is similar to that of iron-aluminum alloys, and at that time, in order to find out the effect of radiation treatment, people put various materials into the experiments, and magnesium-sodium alloys were also thrown into it. Then it was discovered that this thing had a phenomenon of "atomic microcollapse". The collapse rate of this alloy is higher than that of iron-aluminum alloys, and after radiation treatment, the size is reduced by two percent, and the specific gravity is increased by six percent to become 1. 38。 (Titanium alloy specific gravity 4.) 5 or so, high-strength aluminum alloy 2. 8 or so, aluminum-lithium alloy 2. 47 or so)

To put it simply, magnesium-sodium alloys are irradiated by a specific radiation source under certain conditions, and their atoms are squeezed a little tighter, which is confirmed by electron microscopy and metallographic microscopy. This has led to a significant increase in the strength of the alloy, and the corrosion resistance has also been greatly improved, which is close to that of titanium alloy. It's just that the high-temperature strength is lower than that of titanium alloy, but it is much higher than that of aluminum-magnesium alloy. However, the cost of this material is much lower than that of titanium alloys, and the processing properties are much better.

Of course, no matter what, whether it is sodium smelting or magnesium-sodium alloy smelting, it is a relatively high-end technology, and the cost is definitely higher than that of aluminum alloy. At present, the ex-factory price of aviation aluminum is about 600 yuan per ton, while magnesium-sodium alloy is about 2100 yuan per ton.

........................................................................

Danxin Town, Suyou County, Xilin City, Monan Province.

The original name of Danxin Town was "Zhu Rihe Town", and "Zhu Rihe" means "heart" in Mongolian. The name comes from a mountain outside the town, whose shape looks like a heart. In 1916, after the standardization of national place names, this place was renamed Danxin Town, and the mountain was also renamed Danxin Mountain.

Suyou County is located in the north temperate zone, belongs to the arid continental climate, with little precipitation (the average annual precipitation is 170mm~190mm), there are no long-term rivers in the territory, the surface water is poor, the groundwater resources are unstable, and the development of deep water is difficult. Because of the lack of water, before the founding of the People's Republic of China, there were only more than 100 permanent residents here, mainly animal husbandry.

However, the northwest wind prevails here all year round, and the wind force is generally 3~5, which is one of the best wind energy areas in China. With an average annual sunshine of more than 3,200 hours, it is also a very good solar area. Moreover, it is very rich in natural resources, especially iron ore and alkali ore, as well as gold, oil, limestone and other resources.

After the founding of the People's Republic of China, after the "Three North Resettlement" project and a series of infrastructure projects were launched, it began to gradually prosper. In 1922, the North-South Water Diversion Project was partially completed, and the water pipeline from Lake Baikal to the Soviet Union was connected, and a three-meter-diameter concrete culvert brought water from Lake Baikal to this water-scarce land. Once the problem of water scarcity was solved, the development of the area was greatly accelerated. By now, the county has a population of more than 30,000 people, and it has become a bustling small city.

By the way, the "North-South Water Diversion Project" is a very large systematic project, which involves not only the transfer of water from Lake Baikal, but also a series of projects to divert water from the Lena River to Lake Baikal, as well as from other Siberian rivers to the south. In particular, it involves rivers such as the Yenisei and Ob rivers in Belarus, the diversion of water from rivers such as the Yenisei River to Xinjiang, and the diversion of water from rivers such as the Ob River to the Aral Sea and Lake Balkhash.

The specific method is to find suitable terrain near the middle reaches of these rivers to build a dam with a height of 200 meters or even 300 meters, so that it can form a huge reservoir, and use the high drop to make the water flow backwards to form a situation of "north-south water diversion", and the part of the drop power is insufficient to make up for it with a large pump. Considering that the evaporation is high in the area through which the water passes, and that there is also a need to cross mountains and rivers in between, the main journey of the waterway is carried out through underground culverts. When the project is fully completed, water from these northern rivers will be diverted to large areas in the northwest and north through underground culverts.

This can not only meet the needs of desert environment transformation in the north, but also increase a large amount of arable land and pastureland. According to the different types of crops and irrigation methods, it is estimated that 10~2 billion mu of cultivated land can be added, as well as more pasture land and forest land. Of course, this "north-south water diversion project" is very huge, and it is only more than half completed. Fortunately, in the economic crisis in recent years, many white skins from Europe and the United States have come to work, which has greatly accelerated the speed of construction, but if it is to be completed, it is estimated that it will have to wait until 1938. As for the South-to-North Water Diversion Project, it has now been largely completed and is estimated to be completed around 1935.

Danxin Town, located in the south of Suyou County, is a new comprehensive town integrating industry, animal husbandry and agriculture. However, what is a little different from the rest of the county is that this town is semi-military, and most of the residents in the town are military dependents. About 30 kilometers outside the town, in the field, is a large comprehensive training base for the army.

This is the famous Danxin training camp, which contains an imaginary enemy unit that specializes in simulating foreign armies - the Blue Division. Not only do they simulate foreign armies, but they also sometimes make cameo appearances in alien armies, which may be Martians, Zeniths, or Nameks...... In recent years, the various divisions and brigades of the PLA Army have taken turns to play here with foreign or alien armies. Well, the main thing is to be beaten by alien troops, and the PLA Shu millet is often rubbed back and forth by the "alien princes" who press their faces to the floor......

At this time, the roar of artillery rang out from time to time in this training camp.

Uh, that's right, it's aliens again......

In one position, dozens of anti-aircraft guns and armored destroyers lined up in order, taking turns firing at armored targets in the distance. These guns are available in a wide range of calibers, from 35 mm to 105 mm. There were even several anti-aircraft combat vehicles, flattening 75-mm anti-aircraft guns, pretending to be armored destroyers.

There were not many armored targets in the distance, only sixteen, and sixteen tracked vehicles were all grotesque-looking. It can be seen that it was modified with the chassis of the Red Wolf, without the installation of artillery, but with a large steel plate on top of the front, it looks like an ancient shield car.

Sixteen "alien" tanks braved the fire, and the screeching shells rattled the steel plates, but none of them penetrated.

"Nima, what the hell is this! I can't even break through it!"

"How could it be?"

"It's not scientific! It's too unscientific!"

"Paralyzed, director! The aliens are cheating again!"

Looking at the "alien" tanks that were smoking and blazing like a leisurely stroll from the courtyard, the Red officers and soldiers were dumbfounded.

The commander of the anti-armor battalion was about to cry, so he had to helplessly pick up the intercom and report to his superiors: "Division commander, it still doesn't work, 130 is used, and I still can't penetrate those turtle shells......

"Give Lao Tzu a new 105mm armor-piercing bullet! Yes, it's a gold coin bullet! Lao Tzu won't believe it!" Yang Ning hung up the intercom angrily.

Yang Shizuo picked up the telescope with red eyes and observed the situation on the front line.

"Grandma is a bear, 105 companies, all for Lao Tzu to exchange gold coins!" the battalion commander shouted hoarsely.

"Battalion commander, we only have three rounds of gold coin ammunition for each gun......," the company commander reminded.

"No matter what, use it for Lao Tzu!"

Six of the latest "Mountain Lion" 105mm self-propelled anti-aircraft guns, or armored destroyers, got busy. This kind of gun is the main gun of the frigate or the secondary gun of the capital ship in the navy, and it is a gun shared by the army and navy, and it is very powerful. It can hit armored targets not only with armor-piercing shells, but also with armor-shattering shells to blow fortifications, and with grenades against infantry. At present, this kind of chariot has just begun to be assembled, and only the top 20 armor divisions are in stock. For example, the current 9th Mechanized Infantry Division.

The Mountain Lion is a member of the "turretless international", without a turret, the barrel sticks out directly from the front, and the body is lower and lower than the armored combat vehicles (tanks) of its class. In order to fight enemy vehicles, its front face armor is extremely thick, even thicker than ordinary vehicles, but the side and rear armor is not good, and can only carry 20 mm machine guns.

The ammologist opened the ammunition box dedicated to the "gold coin shells", revealing three oddly shaped shells, their warheads shrinking sharply, forming an arrow shape, significantly thinner than the cartridge case. This is a high-speed tail stabilized shell-piercing armor-piercing projectile called "gold coin bullet" in the military, and its front section is a tungsten alloy arrow-shaped cone. Because of the high cost, it was nicknamed "gold coin bullet" by officers and soldiers. But you get what you pay for, and although this thing is expensive, its power is real gold. Theoretically, it can penetrate the armor of the battleship, of course, if it is really used to fight the battleship, it is useless, at most it is just a small hole for the battleship.

The loader starts the semi-automatic loader, picks up a "gold coin bullet" and sends it into the chamber. The commander leaned down in front of the sight and held the crosses in the lens firmly to an "alien" tank.

"Launch!" he pressed the launch button hard.

The muzzle of the "Boom ......" mountain lion spewed out a brighter and thicker cannon flame that was different from before. The other five mountain lions also roared almost at the same time. "Boom...... Rumble...... Boom ......"

With an initial velocity of 1,300 meters per second and strong kinetic energy, the six "gold coin bullets" rushed to the target 500 meters away.

"Bell bell bell ......" A series of piercing crashes sounded. The six "alien" tanks that were hit shook slightly, and continued to move as if nothing had happened.

"I didn't ...... I didn't wear ...... It's 500 meters...... "The jaws of the company commander and the officers and men of the Mountain Lion Company are about to fall.

"No...... That's impossible...... This is a gold coin bullet that can penetrate the armor of a battleship!" Yang Ning almost crushed the telescope.

After a while, the intercom rang, and the battalion commander shouted with a crying voice: "Division commander, it still doesn't work, the gold coin bullets are useless, and it's useless to run out." The last shot was placed at a distance of 200 meters, and the best result was inserted in the armor plate...... We were broken through and lost ......"

"I've seen it all! Okay, we've lost this time!"

Yang Shizuo threw away the intercom, turned around like a whirlwind, and roared at a smiling guy: "Sister Ru, you are cheating again!"

"Alien Chief" held a teacup and smiled happily: "Hahahaha, Lao Yang, I really didn't cheat this time, haven't you even tried gold coin bombs......"

"Phew, if in actual combat, after being hit by a tail stabilized shelling armor-piercing projectile, even if the main armor is not penetrated, the huge vibration generated can reimburse all the electronic equipment and sighting system in the car. Vehicles with damaged components of these two types are no longer combat-ready. ”

Major General "Alien" shrugged his shoulders and said unhurriedly: "But the rules set by the director are broken before they are ...... Moreover, those simulated combat vehicles are all remotely controlled, and you can see that they haven't even stopped, which means that the electronic equipment is not broken......"

"Don't fool me, that steel plate is sticking out, which affects the vibration transmission, or those remote control toys would have broken down a long time ago......"

The "chief director" next to him coughed dryly a few times and said with a smile: "Lao Yang, you didn't lose unjustly this time, their steel plate is a new type of armor, and this live-fire exercise is also to test the anti-destruction ability of the new armor by the way......"