"How?"

Director Hao next to him suddenly asked, and Mu Jingchi was also a little helpless.

"I don't know. ”

He also knew what Director Hao was asking, which was nothing more than whether Professor Gao's theoretical direction was feasible. In fact, the project team of nickel-based superalloys has been established for a long time, but the theoretical direction of the research has not been determined.

In other words, the research direction that was determined did not go through.

"The theoretical idea sounds reasonable, but in the real experimental stage and the calculation stage, it is not known, and the theory is just a theory. ”

Sometimes the proposed theory is good, but the subsequent mathematical calculation encounters difficulties, cannot solve the problem of data calculation, or there is no corresponding mathematical tool to solve the practical difficulties.

In the course of the experiment, the difficulties encountered are even more.

There are too many aspects involved in material research and development, and the problem of material technology is extremely complex, and sometimes the material has changed inexplicably in the experimental process, resulting in a change in the microscopic degree of organizational structure, but the reason cannot be found.

In the end, all kinds of problems will lead to a huge difference between reality and theory, and even when theory is universal, there is no room for practical operation.

"Aren't you optimistic either?"

At this time, the other material leaders began to speak, refuting and refuting the ideas in Professor Gao's research direction, which is a normal thing.

Everyone has something they are good at, and other material bosses start with what they are good at, and point out various problems in the research direction little by little.

No research direction is foolproof, and even the best experimental scheme may go wrong if it is not verified by experiments.

On the contrary, there are theoretical solutions that seem very unreliable but can be verified by experiments.

"I'm not optimistic, I just don't know. "Mu Jingchi's identity is still very correct, in the field of superalloy research, he is really a budding newcomer.

Although he was able to make some suggestions, it was more important for him to come and learn and lay the foundation for future superalloy research.

"At least, I think Professor Gao's idea on grains is very good. ”

As soon as he heard about Professor Gao's research direction, Mu Jingchi knew that the other party had studied his previous paper on aluminum alloys, because in that paper, he mentioned the future research bias of grain growth and other structural changes in recovery and recrystallization.

After the recrystallization of the material is completed, new, fine, and distortion-free equiaxed grains are formed, and grain growth will occur if it is continued to be heated or kept at an isothermal level, causing some property changes, such as the decrease in strength, plasticity, and toughness.

In addition, as the grains grow, other structural changes, such as recrystallization texture, occur.

Both of these will affect the properties of the material, and in the future textbook knowledge, the grain growth and crystal texture have been controlled and created to achieve the corresponding function of the material.

It's just that how to control grain growth and crystal texture involves more in-depth material science and material process issues.

Mu Jingchi has not yet known.

But this line of thinking is correct.

Normal grain growth is a process in which the grains grow uniformly under the action of the interfacial curvature driving force during the continuous heating or heat preservation process after the recrystallization is completed.

In the volume of the metal matrix, the grain size is evenly distributed and increases continuously. At a certain temperature, the grain size is generally uniform, and the fluctuation range is not large, and the average grain size increases with the increase of temperature.

It can be regarded as a trace.

There is also a type of grain growth, which is abnormal grain growth.

It is the process of uneven grain growth that occurs after the normal and uniform growth of the grain under certain conditions. In the process of growth, the grain size is very different, a few grains grow preferentially, and gradually swallow the surrounding small grains, until these preferentially grown grains contact each other, and the surrounding fine grains disappear, all forming coarse grains, and the process ends.

This process is also called secondary recrystallization.

If the grain growth is controlled, then it can also affect the performance of the material, and the grain itself is also interrelated with dislocation, which can be said to affect the whole body.

It's not that simple.

In grain growth and secondary recrystallization, long-term annealing and high-temperature heating are used to form a new recrystallization texture. In the process of recrystallization, there are a variety of deformation and texture conditions, among which the texture components with favorable growth orientation can be selected to grow to form a new recrystallization texture, and the presence and control of the second particle also have an important impact on the development of directional growth.

The formation of a recrystallized texture can make the material anisotropic, which has a significant impact on the material properties and applications.

On the one hand, it has a favorable effect, such as the magnetic anisotropy of soft magnetic materials, and the direction of the cube metal is easy to magnetize, and high magnetic induction intensity can be obtained under a small external magnetic field.

Taking silicon steel sheet as an example, controlling the cold-rolled deformation and recrystallization annealing temperature can make the cold-rolled silicon steel sheet obtain two recrystallization textures with easy magnetization direction, namely Gaussian texture {110} and cubic texture {100}, which can ensure excellent magnetic properties.

On the other hand, the formation of recrystallized texture has a harmful effect, and the formation of recrystallized texture causes anisotropy of mechanical properties, which is not conducive to the processability and usability of the material.

For example, the deep-drawn copper plate, deformed by 90% cold rolling, annealed at 800 °C, forms a cubic texture {100}, with directionality, different directions of plasticity, forward rolling direction and vertical rolling direction, δ=40%, and rolling direction in the direction of 45°, δ=75%.

The uneven deformation in all directions results in uneven thickness and uneven edges, which makes the product scrapped.

In this way, Professor Gao still has ideas for his direction. ”

Mu Jingchi nodded at Director Hao's words, "The idea is good, I think this can be used as a direction, but I don't know what the result will be." ”

The performance of the material is reflected in the microstructure, and the performance of the material can be changed by mastering the microstructure in the material, and transforming or even creating it in a timely manner.

Therefore, as long as you grasp the internal laws of the material little by little, you can achieve the purpose of improving performance.

This is true for dislocations, as well as for grain growth and recrystallization textures, and so for many more.

Of course, our technology does not allow us to directly manipulate the internal microstructure of the material, and can only affect the internal microstructure by applying conditions from the outside.

After Mu Jingchi's sentence fell, Director Hao did not continue to discuss, and listened carefully to the research and discussion between others and Professor Gao.

As Mu Jingchi, who has just entered the field of superalloy research and development, he naturally does not come out first, he just listens carefully to all kinds of knowledge about the research and discussion of nickel-based superalloys, and occasionally takes a pen to write down some interesting content in the small notebook he prepares.

···

The other side.

"My little ancestor, you really don't take it?"

As Song Xiaoyi's agent, Wu Qingyuan was about to kneel down for Song Xiaoyi and asked her to take over the play.

"I really don't take it. ”

Song Xiaoyi held a notebook in his hand and wrote and drew on the notebook with a signature pen, which was about the villa decoration plan.

The decoration of the villa has entered the final stage, and Song Xiaoyi is thinking about whether there is anything that needs to be added, or what needs to be discarded.

Of course, some things exist in the imagination, but after they are actually implemented in the villa, Song Xiaoyi feels that they are placed in general, and they do not achieve the imaginary effect.

That's when it's time to replace it.

"Sister Wu, I said that I would take the postgraduate entrance examination, and I would not take the drama. Song Xiaoyi thought about it and threw out the words, "Besides, the script you brought me is too bad, the heroine's behavior is completely illogical, and the lines are brainless, if you really want to act according to such a setting, I will vomit myself." ”

Song Xiaoyi and Mu Jingchi stayed together, and they were also influenced by each other.

When watching movies and TV together at night, Mu Jingchi always talks to Song Xiaoyi, which is aimed at the parts of the film and television that are not in harmony, and the character setting is not tenable at all.

Mu Jingchi, the flow of martial arts, will not say it, but the flow of modern cities, he will definitely say it.

Yes, Song Xiaoyi also slowly studied the script.

"You don't care if she has logic or not, it's good to make money, 50 million!" Wu Qingyuan stretched out his palm and showed his five fingers, "It's not five million!"

Song Xiaoyi shrugged, "I'm not short of money!"

"There you go, pet!"

She immediately wrote it down in her small notebook, "The villa is indeed a little deserted when only I live with him, and even if I move the aquarium and those potted plants in his house, there is still a lack of vitality." ”

"It's just right to have pets, cats and dogs. ”

"Also, you can change to a large aquarium, the aquatic plant ecology is also better-looking, and there are more fish species. ”

Song Xiaoyi nodded as he wrote.

"Okay, there's no logic to this urban movie character, PASS. Wu Qingyuan followed Song Xiaoyi's train of thought, "Then this costume drama is always okay, right? This character's actions, behaviors and words are very good, and there are no logical problems, why don't you take this?"

"There's a kiss scene here, I'm definitely not going to take it!"

Song Xiaoyi's small notebook turned the page, and taking the opportunity to turn the page, she glanced at the name of the costume drama and opened her mouth to answer, "I promised my boyfriend, I won't accept any kiss scenes!"

Wu Qingyuan slapped his forehead, a little helpless.

It's okay now, and many scripts are missing. It is impossible for her to discuss with Mu Jingchi to ask the other party to allow Song Xiaoyi to shoot a film and television drama with a kiss scene, which is unrealistic.

"Sister Wu, don't pick a show for me, I really won't take the play for the time being. Song Xiaoyi faced Wu Qingyuan, "I want to prepare for graduate school seriously, as for taking on the play, I will wait until I am in graduate school, and I will not accept all the plays at that time." ”

"Okay!"

Looking at Song Xiaoyi's expression, Wu Qingyuan also knew the other party's intentions and stopped dwelling on it.

"What about variety shows?"

Song Xiaoyi's eyes lit up, and she said with a smile: "You can pick up variety shows." ”

Wu Qingyuan's smile suddenly rose, "There happens to be a variety show, are you going?"

"What a show. ”

"Happy Camp. ”