Computational simulations of the new material soon began.
A few days later, Lin Xiao came to the Aeronautical Materials Institute again, but the place was not the previous Research Room 4, but to the Materials Data Center inside the institute.
Here, computers have higher computing power and are more secure, avoiding the possibility of being monitored by the outside world.
The country on the other side of the Pacific has never been less concerned about China's network surveillance, especially the research on this kind of national defense technology.
Even if they check the literature, they need to leave it to professionals to help prevent the documents they have checked from being captured by foreign countries, which will eventually lead to the leakage of the research content, and even the final research results may be inferred by the other party, or even carried out.
copy.
All in all, this kind of research requires safety precautions.
"Okay, not much else to say, Lin Xiao, let's build the model now."
Sitting in front of the computer, Chen Bao said to Lin Xiao.
"good."
Lin Xiao made an 'ok' gesture.
"Well, Xiao Huang, please bring the data."
Chen Bao greeted from behind.
After Huang Haoran responded, he handed their data to Lin Xiao and Chen Bao.
Lin Xiao and Chen Bao have also opened the relevant software and started using it.
To conduct simulation calculations based on existing materials, we must first understand the various structures of their materials.
"Our γ-TiAl alloy mainly has two structures: L1o and B2. Lin Xiao, you start from the L1o structure, and I will build the B2 structure."
"Okay." Lin Xiao responded.
I looked at the information from the side and saw [L1o type lattice structure, lattice constants a=b=3.984, c=4.065A, tetragonal crystal system with space group p4/mmm].
Enter relevant data, then establish an atomic coordinate system, and then replace some of the atoms, mainly with other metal elements.
Then the software will roughly estimate whether their properties can meet their requirements based on the characteristics of these atoms and so on.
Just like that, Lin Xiao was working on it, and several graduate students were standing behind him, watching Lin Xiao's "show off".
Of course, now it is just inputting data, not a showy operation.
The real show of operation is below.
Using software, the first-principles pseudopotential plane wave method is used, and the standard pseudopotentials of different metal elements are selected to describe the interaction between the real ions and valence electrons.
Seeing Lin Xiao entering more and more data, the others behind him became more and more confused.
They have never learned how to use this thing, so of course they will be at a loss, but at this time they have to express their surprise in their hearts. Lin Xiao has only learned it for a month, and he is only 6. What kind of learning efficiency is this?
That's outrageous.
It would be too shameful for them to be ordinary graduate students who graduated from Beijing University, Tsinghua University, or National University of Science and Technology, etc., and then came here to study as graduate students.
But they soon calmed down. After all, this is computational materials science. Although it sounds very high-level, and sometimes supercomputers are used as assistance, it may not necessarily be able to produce anything. They are honest.
Just conduct your own experiments on the spot, which is something Lin Xiao cannot compare to.
Moreover, after the simulation calculation results are obtained, they will have to design the process, and Lin Xiao will watch them show off their operations.
So they stopped trying to compare with Lin Xiao and watched quietly.
Time flies by quickly. Although computers are convenient, they are not convenient for people to use, and they also require a lot of time.
Even when it's time to eat, Lin Xiao and Chen Bao will stick to their posts, and other graduate students will be responsible for bringing them meals from the cafeteria.
What I brought was a lunch box, one box of rice, and the other box was a mixed bag of shredded potatoes, vegetables and twice-cooked pork.
Lin Xiao didn't have any requirements for food. Apart from bitter melon, he was basically not picky about food. He finished his meal quickly and then continued to stay in front of the computer and perform various simulations.
In this way, they started working at nine o'clock in the morning until nine o'clock in the evening.
Lin Xiao was fine as a young man, but Chen Bao, a man in his fifties and sixties, still persisted like this. After seeing it, he secretly admired it in his heart.
This is probably a true scientist who devotes his whole life to scientific research.
Especially scientists like Chen Bao who have provided huge assistance to national defense science and technology.
Although for people like them, this is just their interest and they are happy to do this kind of thing, people who silently enjoy the stability they bring should also express their gratitude to them in their hearts.
until half past nine in the evening.
"Okay, let's stop here today. Lin Xiao, how do you feel? You are quite familiar with it."
Chen Bao stopped operating the mouse, stood up and stretched, then asked Lin Xiao with a smile.
Lin Xiao said OK and said with a smile: "It's okay. I also tried it myself some time ago and modified the GDL-4 steel."
"Anthracene? What's the result? Do you want Xiao Huang and the others to help you trial-produce it?"
Lin Xiao quickly waved his hands and said in a dumbfounded voice: "No, no, no, I just tried it casually, maybe it's some kind of waste."
"Haha, maybe it will succeed?"
Chen Bao waved his hand: "Our industry was called alchemy in ancient times. No one can be sure about luck."
"Okay, that's it for today, let's continue tomorrow."
…
It will continue tomorrow and the day after tomorrow.
About ten days passed. Lin Xiao and Chen Bao made some repairs and modified the unit cell structure no less than eight times. Sometimes their model would directly crash in their software, that is, their model would crash directly in their software.
A certain model was judged unsuccessful by the software.
However, it was not until the ninth time that we finally succeeded in developing a material model that could satisfy the physical explanation. According to calculation simulations, the creep resistance of this material should be improved by about 20%.
Then the relevant production process is designed based on their model.
This has nothing to do with Lin Xiao, unless he uses truth points directly. However, since Chen Bao and the others can directly design how to produce this thing, there is no need to spend truth points anymore.
Time passed quickly, from March to April.
Another day, in the foundry laboratory of Research Room 4.
"It's out of the oven, it's out of the oven."
Huang Haoran shouted, and then they quickly ran to the electric arc furnace, where they poured the molten titanium alloy water into the consumable shell furnace next to it for molding. This furnace can effectively prevent the crucible from contaminating the active metal liquid.
After cooling, finally, a titanium alloy metal rod appeared in front of them.
Next, it’s time to go back to the material testing laboratory next door to conduct creep performance testing.
However, the results disappointed them.
This new material took them half a month to develop. There is a big gap between the actual creep resistance and the creep resistance calculated by their previous simulations.
Although it is stronger than the original material, it is only a little stronger.
This point has not even been reached by 1%, which obviously does not satisfy them.
"Let's continue to modify it. Let's try it and add some other elements."
Chen Bao showed regret on his face, but he quickly recovered and said.
If they were lucky, they might reach their expectations right away, but now their luck is obviously not very good. Of course, being a little stronger is at least better than not being strong at all.
So next, they returned to the computer room and continued the simulation.
Lin Xiao looked at the mathematical model displayed on the computer and felt troubled.
What to do next?
Suddenly, he remembered the system.
Is it possible to check whether your research direction is correct through the system’s quotation of truth points?
Then you can have sex for free?
When he thought about it, his eyes lit up. It seemed feasible?
So he immediately asked in his mind: "If the system uses molybdenum atoms instead of aluminum atoms, can its creep resistance be improved by 50%? How many truth points do I need to ask this question?"
System: "This question requires 13 truth points."
Lin Xiao then asked: "What if zirconium atoms are used instead of titanium atoms?"
"This question requires 13 truth points."
"It is the same?"
Hearing this answer, Lin Xiao frowned.
In a single unit cell, there should be a big difference between replacing aluminum atoms with molybdenum atoms and titanium atoms with zirconium atoms. How can they be the same?
He used his 4.35% brain to think carefully, and suddenly guessed a possibility, so he asked again: "How can we improve its creep resistance by 50%?"
"This question requires 13 truth points."
The system's voice sounded as always.
At this time, Lin Xiao couldn't help but have a guess.
The system does not care about the distance between the direction and the target, but only the absolute distance between the target and the current stage.
The absolute distance is the final price it gives.
Just like if he leaves the Institute of Aeronautical Materials and walks north, he may reach Beijing University in a few kilometers. But if he leaves the house and walks south, he will have to circle the earth, but the distance between his starting point and his destination is
The distance is still so much.
Therefore, the idea of judging the success of a research direction through the quotations given by the system is basically impossible.
Unless you spend some time researching in this research direction, and then determine whether your direction is correct by whether the system quotation has decreased.
If you calculate it this way, you can still get away with it. At least you can determine in time whether you are going in the right direction and avoid entering a dead end. However, it does not rule out that after research, you will already know whether the direction is correct, and there is no need to ask again then.
Shaking his head, Lin Xiao gave up the idea of a free prostitution system.
However, if it would take 13 truth points to increase the creep resistance of their TiAl alloy by 50%, how much would it cost to increase it by 100%?
He immediately asked this question in his mind.
"This question requires 29 truth points."
29 points of truth!
Lin Xiao was shocked, it was so expensive!
But he thought for a while and asked: "If its strength, oxidation resistance, volume stability, and high-temperature structural stability are all improved to a certain extent, how much will it cost?"
"This question requires 44.2 truth points."
Did it only increase 15.2 truth points?
Lin Xiao thought about it carefully and estimated that it was because there would be duplication in meeting these requirements. For example, if the creep performance is stronger, the high-temperature structural stability will also be stronger.
However, this 44.2 truth point... doesn't seem to be unacceptable to him?
He suddenly asked Chen Bao next to him: "Academician Chen, what if we could improve the creep resistance of this thing by 100%?"
"One hundred percent? Good guy, I think an increase of 30% will be good. It will definitely be a candidate material for our future turbofan-15 engine wall panels. If you increase it by 100%, it will be good.
One hundred, is it going to be built directly on the fan blade?"