Technology: The naughty kid ruined my college entrance examination, but I turned over to nuclear fus

The idea of using B2 phase particles to strengthen memory metals has indeed been tried before on conventional alloys.

But... It was used on memory metal, but it was the first time he had heard Lu Yu mention it.

Whether this idea is practical or not is not a matter of discussion.

Even if it is really feasible, relying on B2 phase particles alone to strengthen memory metals may not be able to support the smooth fixation of memory metals on Mars rovers, right?

You know, the various climate and terrain conditions of Mars are far more peculiar than Blue Star!

Once encountering large-scale wind, sand, hurricanes, and severe hot and cold temperature differences, memory metal cannot support the normal operation of solar power panels, then the consequences are unimaginable!

That's why... Although memory metal has so many advantages, it is one of the reasons why it was not designed as a material for Mars rovers from the beginning!

"Relying on a single B2 phase particle to strengthen the memory metal is really not enough to support the stability of the crystal."

"But."

"There are still many means available to achieve our goals."

"Director Lin, you've heard of it.... Is the fine grain strengthened?

A smile appeared on Lu Yu's face.

"Fine crystal strengthening?"

A look of doubt flashed in Director Lin's eyes, he did have a certain degree of understanding of memory metal, however... The idea of fine crystal enhancement, he had indeed never touched it!

"Director Lin, the principle of fine crystal strengthening is actually not complicated."

"It is a method of improving the mechanical properties of metal materials by refining grains."

"When the fine grain is plastically deformed by external force, the dislocation is blocked by the grain boundary before sliding to the grain boundary, resulting in tangling and plugging of the dislocation, which increases the resistance of the dislocation movement, thereby improving the strength and hardness of the metal."

"Moreover, fine grains are also conducive to improving the plasticity and toughness of metals, because fine grains can make plastic deformation more uniform, stress concentration smaller, grain boundary area larger, grain boundaries more tortuous, which is not conducive to crack propagation."

Lu Yu explained the general principle, and Director Lin began to think.

"Then as you say... How can it be put to concrete use?

After considering the plan proposed by Lu Yu for a while, Director Lin raised key questions.

It's useless if a solution just sounds perfect, and if it can't be easily put into a specific application, there's no doubt... The value will be incomparably low.

"The way to put it into a specific application is actually very simple."

"With the laboratory capabilities of our Zhurong No. 2 Research Center, it is completely possible."

"We can increase the subcooling, and when the subcooling is greater, the more nuclei are formed when solidifying, and the finer the grains grow."

"After the subcooling degree is completed, a certain degree of deterioration treatment is carried out, and a certain amount of metamorphic elements are added to the alloy."

"Such as titanium, zirconium, niobium, etc., so that it forms stable compounds with other elements in the alloy, and acts as crystal nuclei when the alloy solidifies, promoting the formation of fine crystals."

"Vibration or agitation is then applied during the alloy solidification process to break or disperse the coarse grains, allowing them to recrystallize or grow into fine grains. Cold deformation and annealing are controlled, and for cold-deformed metals, grains can be refined by controlling the degree of deformation and annealing temperature. The greater the degree of deformation, the lower the annealing temperature, and the better the refinement effect..." Lu

Yu once again introduced how to put it into specific use to Director Lin completely.

To the layman, it may sound foggy and confused.

But in the end, Director Lin is an expert in the aerospace industry of the Dragon Kingdom, and he also has a lot of research on the memory metal sector.

After listening to Lu Yu's general introduction,

his face suddenly showed a touch of understanding!

"If you say so, it is indeed a good way to strengthen with fine crystals and follow up on the strengthening of B2 particles!"

Director Lin nodded.

B2 phase particle strengthening and fine grain strengthening can be said to have their own advantages and disadvantages.

The common denominator of B2 phase particle strengthening and fine grain strengthening is that they can significantly improve the strength of metal materials, and B2 phase particle strengthening can also improve the high temperature performance of metal materials.

However....

The shortcomings of B2 phase particle enhancement can be well compensated for by fine crystal strengthening!

B2 phase particle strengthening will reduce the plasticity and toughness of metal materials to a certain extent, and B2 phase particle strengthening needs to control the content of alloying elements and the size, morphology and distribution of precipitated phases, otherwise it will lead to brittle fracture!

But for fine-grained strengthening, this distress is much smaller.

It only needs to control the size and distribution of grains, which prevents grain boundary slippage and grain growth, thereby reducing the strengthening effect.

"That's right!"

"There is one last problem, if you follow your ideas Chief Engineer Lu, you can indeed solve the problem of insufficient strength of memory metal."

"But... And how to solve the problem of insufficient extensibility after strengthening?

Director Lin's face showed a look of doubt.

The principle of memory metal is actually very simple.

At a certain temperature, it will undergo plastic deformation like plastic, but at a certain temperature it can return to its original state, with a certain "memory ability".

This "memory ability" is due to the fact that its crystal structure changes with temperature (mainly the transition between martensite and austenite), which leads to changes in the overall state of the material at different temperature ranges.

If you follow the method spoken in Lu Yu, you can certainly prevent the risk of damage caused by insufficient strength!

But...

After using two layers of strengthening, the distance between the particle crystals is greatly shortened, and under the fixed structure, the original deformation ability of the memory metal will also be greatly affected!

If there is no way to preserve the "memory ability", what is the point of whether this memory metal is used or not?

"Director Lin, I know your concerns."

"After all, since you plan to use memory metal, it is natural to maintain its memory function and extensibility in the first place."

"And the elongation and memory ability of memory metals mainly depend on the phase transition between martensite and austenite in its microstructure."

"Martensite is a low-temperature phase with low symmetry and greater deformation capacity, and austenite is a high-temperature phase with high symmetry and small deformation capacity."

"As long as we control the rate of conversion of the two, we can strengthen its molecular structure while maintaining its extensibility!"

Facing Director Lin's question, Lu Yu's eyes did not have a little panic.

With a confident smile, he continued:

"My ideas are mainly divided into controlling stress and strain rates during deformation, and recovering heat treatment of the alloy after deformation."

When the memory metal is subjected to an external force, it undergoes a phase transition, from austenite to martensite. This phase transition is reversible, that is, when the external force disappears, it returns to its original austenite state.

"However, if the external force is too large or changes too quickly, it can lead to reduced stability of the martensite and even cracks or fractures." This will affect the extensibility and memory effect of the memory metal.

"Therefore, in order to maintain the extensibility of the memory metal, it is necessary to control the stress and strain rate during the deformation process to keep it within a reasonable range..." With

Lu Yu's narration, the color of understanding in Director Lin's eyes became brighter and brighter!

"So it is!"

"If you really follow the scheme you said, maybe you can really use memory technology to replace the original damaged part!"

"What a genius!"

Director Lin's eyes showed a look of surprise!

"Director Lin, if you still don't understand anything at that time, just call me directly."

"I'll have to leave Kyoto in a while."

"At that time, the affairs here will be entrusted to Director Lin."

Lu Yu said slowly.

The idea of replacing solar panels with memory metal is indeed exciting!

But it's a pity to think about it, because he was about to participate in the landing research of Gutuo Mountain, and he couldn't help the research center to deal with the processing of memory metal.

However, with Director Lin's Fixing Sea God needle in place, Lu Yu believes that they can also handle it properly!

"Hahaha, don't worry."

"At that time, if there is any question I don't understand, I will definitely ask you kid the first time, hahaha."

Hearing the news that Lu Yu was about to leave Kyoto, Director Lin's eyes flashed with surprise, But... He didn't ask much!

Lu Yu's body has too many secrets!

Many of them may involve top-secret level information, so Director Lin simply did not open this mouth.

"Okay."

"It's not early that day, you rest first, I'm going back too."

Lu Yu bowed his head slightly and said with a smile.

He glanced up at the window, he had just discussed with Director Lin about memory metal for so long, perhaps because he was too excited to chat, he didn't notice the passage of time at all.

Originally, it was not early, plus such a delay... It's even late.

The moonlight is like a shadow, hanging in the sky, like a crooked hook.

"Mr. Lu, let's go back."

"Hmm."

Lu Yu bowed his head slightly and sat in the special car.

Looking at the flashing car shadows outside the window, under Lu Yu's deliberate attention, he found many vehicles that looked different from cars on ordinary roads.

Lu Yu was not surprised.

Since that incident, the national level has become more and more concerned about its own security!

Whether it is the carry-on security force around the parents, or the protective force around them, they have also been greatly strengthened.

For some people, it may feel a little unfree and uncomfortable.

But Lu Yu doesn't matter.

Finally, the car slowly arrived at his professor's apartment at Longtech University.

It has been almost a whole day since I came to Kyoto, but Lu Yu still walked into the original house for the first time, fortunately, Zhong Lao sent someone to clean up in advance, the overall house looked clean and tidy, and let Ah Chu take care of it a little and be able to rest.

"Will there be any accidents in the experiment on Gutuo Mountain?"

Lying on the bed, Lu Yu began to inevitably think about this question.

For current exoskeleton device research.

A landing test of Mount Gutuo, there is no doubt ... The importance is self-evident!

Once the landing test is successful, then the exoskeleton equipment can be industrialized and mass-produced!

Whether it is for the entire industrial system of the Dragon Kingdom, or for the combat effectiveness of the Dragon Kingdom's army, it is a stimulant!

But once the experiment fails!

Not to mention that all the previous efforts were in vain, but it also took a lot more effort.

Lu Yu has already done everything he can. The rest... I can only do my best and resign myself to fate.

--The next day, early in the morning, the

shadows of trees were shining, insects and birds were chirping.

The morning sun fell on Lu Yu's windowsill, waking him up from his sleep.

Although it was his first night back in Kyoto, it was also the penultimate in a short period of time. After today's end, early the next morning he will follow the entire experimental team to Gutuo Mountain to carry out the next step of research.

Today, it's the last day of buffering and relaxation.

"Hmm..." Lu

Yu straightened up, and after a big yawn, his spirit also lifted a little.

Today's original arrangement was actually to repeatedly study the specific data of the experiment on Gutuo Mountain in the laboratory to prevent any unexpected situation at that time.

But!

Yesterday, Lu Yu changed his mind.

Sometimes it is too late, people sometimes release a relaxation and then put energy into research and study, maybe they can be more efficient and achieve twice the result with half the effort.

It just so happened that he was able to explain to Liu Miao'er what happened that day.

Although, many things may involve confidential information, and there is no way to confide it easily.

However, to put it in general, it is enough to dispel the previous misunderstanding.

Lu Yu roughly faced the mirror, sorted out his clothes a little, and then set off to the better place!

Soon.

At a glance, he found Liu Miao'er in the crowd!

The reason is also simple!

Liu Miaoer's dress today..... It's so different!

Unlike the usual youthful and beautiful dress, today's Liu Miaoer wore a large black coat, a dark gray hat and mask, and a dark black scarf around her mouth.

The whole face is firmly blocked outside the mask and scarf, and you can't see clearly!

If it weren't for his figure, Lu Yu might not have been so easy to recognize at a glance!

"Willow.... Over here!

Lu Yu subconsciously wanted to call Liu Miaoer's name, but before shouting, he still slowed down and changed his original action to a wave of his hand.

Liu Miao'er, who had wrapped herself in rice dumplings, was stunned, and then quickly came to Lu Yu's side.

The two people looked at each other, and did not say anything with great tacit understanding, but came to an extremely remote corner.

After confirming that there were no people around,

Liu Miaoer finally breathed a sigh of relief and removed the hood on her head.

Her cute little face was flushed:

"Whew..."

"Choke me!" I almost didn't catch my breath just now, hey.

"You know what you just looked like?"

Lu Yu asked with a smile.

"Like what?"

"Like a.... The mummy that just crawled out of the Loulan tomb. "