The Literary Life of a Science Leader

Chapter 184 The Seminar That Was Unfavorable
"What's the matter, you don't seem to be in a good mood?"

Song Xiaoyi looked at the sullen Mu Jingchi, leaned next to him, and asked cautiously.

Because the decoration of the villa hasn't been finished yet, Mu Jingchi still lives in this Shengjing community. As soon as he got home, Song Xiaoyi came over from next door.

"No, it's just a little frustrated."

Mu Jingchi took a deep breath, and then let it out slowly, "The research project at Yangang Research Institute is more complicated than I thought before, and I suffered a little setback."

Looking at Song Xiaoyi, Mu Jingchi waved his hands, "It's nothing, don't worry."

"Are you having trouble at work?"

Although Song Xiaoyi doesn't understand her boyfriend's material career, it is still possible to care about relationships occasionally.

"Yes!"

Mu Jingchi lay on the sofa, stretched his waist, and stretched his body, "This is the first time I encountered difficulties in the direction of theoretical research and was directly dismissed."

Turn back time.

In the theoretical research room, Professor Gao first explained his research ideas. Although he encountered opposition from other bigwigs, this kind of opposition was not a bad thing, and it was not for the sake of opposition, but for the problems in the research direction. be opposed to.

The starting point of this objection is for the smooth progress of the research and development of this nickel-based superalloy.

Therefore, Professor Gao is not angry. He knows that the shortcomings in his research ideas are pointed out one by one by these people. Then the next time the seminar is held, his ideas will be clearer and the research plan will be clearer. That's better.

Later, Professor Xu also began to publish his own research ideas.

It is different from Professor Gao's idea, but it also focuses on heat treatment. Although it seems to be on the same path in general, the final direction is different.

Mu Jingchi still listened attentively and took notes with a pen.

Professor Xu's research direction was also refuted by the bigwigs, and Professor Gao also found many problems in it, refuted the unacceptable part with his profound theoretical knowledge, and explained that the research direction was incorrect.

Naturally, Professor Xu will not give up. He also has his own ideas, and the ideas seem to be completely tenable, so he conducted a research debate with the bigwigs present.

Whenever this happens, Mu Jingchi is always the most meticulous and never relaxes at all.

Because so many people present are immersed in superalloy projects, their theoretical knowledge, experimental experience and research ideas are all extremely profound.

Moreover, the knowledge system has been established, and often a small problem can lead to more problems, which in turn triggers a big outbreak of problems in the research content.

There are all kinds of problems.

At this time, Mu Jingchi's thinking must follow the words of these people. Their words are based on material knowledge, and they are not groundless and casual.

Following the words of these people, Mu Jingchi gradually figured out the thickness and breadth of theories of these bigwigs, and sometimes Mu Jingchi would also think about the problems they mentioned.

Is there really no way around it?

Or can another way of thinking solve it?
If it is not resolved, will it really have such a big impact?

All in all, the scene of the dispute is very lively, but it has something to say.Although their ages are already middle-aged, Mu Jingchi can see the vigorous vitality of research from their faces. Everyone exudes a kind of scientific research vitality, which is not due to the growth of age. And add a little more anger.

"Dr. Mu, please tell me what you think."

Disputes always come to a standstill. Each big boss expresses his thoughts and ideas and determines his own research direction, but none of them can convince everyone.

I can only slowly check for leaks and make up for gaps, so as to make my research ideas more perfect.

At this time, Director Hao spoke and asked Mu Jingchi to speak.

Mu Jingchi glanced around, and seeing that many eyes were looking at him, he no longer maintained the role of the audience, stood up, and projected the prepared materials.

"Since Director Hao asked me to talk about it, I will talk about my research ideas. I hope you will forgive me for any shortcomings."

In his research group, Mu Jingchi is the person in charge, there is absolutely no such statement.

"My idea is about the thermodynamics of materials. According to the required properties of the nickel-based superalloy, a hypothetical model is made, and the alloy phase at a certain temperature and composition is determined according to the hypothetical model's Gibbs free energy curve of the alloy phase and the thermodynamic conditions of phase equilibrium. The equilibrium state of the phase, and then..."

Simplified, Mu Jingchi's thinking is very easy to understand.

Based on the mechanical properties to be achieved, the microstructure model of the material is simulated by computer, and the phase diagram is constructed, which is used as a reference to achieve the simulated phase equilibrium state by using external conditions.

Although there is definitely a gap between actual and theoretical simulations, this is also a method.

This is not such a whimsical idea, other bigwigs must have thought of it, but why did Mu Jingchi bring it up?Because he has accepted the relevant knowledge of the future!
Whether it is phase diagram thermodynamics, or related mechanical properties based on the use of mathematical tools to build material models, these will be developed more in-depth in the future. Naturally, Mu Jingchi is on this road with the help of future knowledge. can go further.

So, he brought it up.

"You can look at some of the phase diagrams I made, which are the Gibbs free energy-composition curves of each phase at different temperatures..."

Mu Jingchi has also gone through a lot of big scenes, so naturally he will not be intimidated by the format of this seminar, his conversation is fluent, his thinking is clear, and he is well-founded.

When the Gibbs free energy-composition curves of the two phases do not intersect, it means that only a stable single phase exists at a certain temperature, and this stable phase is the phase with the lowest Gibbs free energy, which corresponds to the single-phase region in the phase diagram .

If the Gibbs free energy-composition curves of two phases intersect, there must be a common tangent line, and the corresponding compositions of the two tangent points represent the compositions of the two equilibrium phases at this temperature.In this composition range, there are corresponding two-phase regions on the phase diagram.

The weak two-phase Gibbs free energy-composition curves intersect, but only tangent at the point of intersection, then in the phase diagram, corresponding to this tangent point is a phase change electricity, which means that the two phases with the same composition are in equilibrium.

When there are three phases, such as three Gibbs free energy-composition curves intersect in turn, there are two common tangent lines, and there are two pairs of equilibrium phases, and the components corresponding to the tangent points represent the components of their equilibrium phases, such as the three-phase Gibb There is only one common tangent line in the free energy-composition curve, indicating three-phase equilibrium.

The composition corresponding to the three tangent points represents the composition of the third brother's equilibrium phase, and there is a horizontal line corresponding to the coexistence of the three phases on the phase diagram.

Phase diagrams are very important to material scientists, just as maps are to travelers. Therefore, if the phase diagrams are perfectly constructed, they will have a huge effect on materials research.

For example, what can be synthesized by mixing several compounds together, and how many expected phase compositions can be obtained in the end; such as the structural stability of materials under the conditions of use, such as the composition design of new materials, the determination of material preparation processes, etc.

Because of this, the other big guys also listened very carefully, as did Professor Gao and Professor Xu.

"According to the phase diagram established by the Gibbs free energy-composition curves of the liquid phase and the solid solution phase at different temperatures, the free enthalpy of the L phase and the solid solution α phase at T0, T1, T2, T3, T4, T5 and other temperatures is given -Composition curves and corresponding phase diagrams."

Mu Jingchi was still talking eloquently, with an expression of extraordinary confidence on his face.

"For the above case where a continuous solid solution is formed, it is considered to be a disordered solid solution, which can be regarded as an ideal solution, and the relationship between its vapor pressure and composition obeys Raoult's law."

"At temperature T, a solid solution of composition xs/b is in equilibrium with a liquid phase of composition xl/b."

"At equilibrium, the following relations exist: μl/a=μs/a; μl/b=μs/b."

"The chemical potential of the A component in the two phases can be expressed as, μl/a=G0l/a+RTlnxl/a; μs/a=G0s/a+RTlnxs/a."

"..."

"Ln(Xsb/xlb=△Hma(Tb-T)/RTTb) can be derived."

"..."

Due to limited time, Mu Jingchi came to the nickel-based superalloy project team for too short a time, so he only made the beginning and did not participate in the more in-depth part.

But Mu Jingchi felt that it was worth studying in this direction just at the beginning.

When the results will be produced, Mu Jingchi is not sure whether the results are good or bad, but the research idea that Mu Jingchi came up with is an idea that integrates future material thermodynamics and mathematical methods and tools, which is more powerful than the current idea. Forward-looking, it is worth investing in this direction.

"Dr. Mu, your plan...is not rigorous?"

The first one to speak was Professor Gao. His words were actually very euphemistic, and the implication was that he directly denied his research direction.

"It is feasible to use computer simulation to simulate the microstructure of materials, but it is not enough to support this model as the basis for further study, which is somewhat imprecise."

Mu Jingchi glanced at the others. The other bosses either had expressionless faces or looked at their own research plans and did not pay attention to Professor Gao's speech.

"There is a deviation in the initial model, not to mention the subsequent phase diagram, and it involves more in-depth composition design and material technology. This deviation is hard to say."

"There are also thermodynamic calculations behind this. I don't understand some equations and formulas. It seems to be a mathematical tool proposed by Dr. Mu yourself?"

"I don't know if the application of these mathematical tools is correct and accurate."

"The most important thing is, Dr. Mu, we have discussed your idea before and have done related experiments. But the experimental data is far from the theoretical data, and it cannot be used as a guide for material research and development at all."

Mu Jingchi's expression was a bit serious, and he didn't say any other words of refutation.

"I see. Thank you, Professor Gao, for correcting me. I'll think about it again."

After speaking, he sat down and ended the speech.

(End of this chapter)