When I Was a Copywriter, I Was Urged to Update by the Original Character

"Breathing of water... living and flowing!"

One knife, two knives, three knives...

One step, two steps, three steps...

Every time Yukinoshita Yukino takes a step, his body will turn around, and the knife in his hand will double as fast. It is as gorgeous as a sword dance, and the surrounding snow will follow his rotation, just like the special effects made in anime. The eyes are full of snow twilights one after another, and Yukino under the snow is like an elf in the ice and snow, noble, flawless, light and gorgeous.

After a wave of snowflakes slid across the rock, Yukinoshita Yukino's sword finally cut on the rock.

"Ding--!!!"

In the sound of gold and iron clanging, the Taidao was cut into two pieces when it was cut on the rock. Those broken Taidaos spun around in the air, and fell to the nearby trees with the blown snowflakes.

"sou—"

In the sound of breaking through the air.

"Om-"

The broken knife in the big tree at that section swayed slightly, made a buzzing sound, and finally stopped.

The Saint of Longgong Temple also took a few steps forward, came under the tree, took advantage of his height, took the broken knife from the tree, and took a careful look.

"Well, the location of the cut was not good, what a pity this knife."

"It's really an accident that you will take the initiative to come out. Aren't you afraid that I'm also a ghost?"

Yukinoshita looked at Shengya Longgong Temple and said mockingly.

"If so, it's just right, there is no one around now, it's a good time to deal with you."

The saint of Longgong Temple also raised the wooden knife in his hand and said.

"Hmph! I really don't know what Mako is looking for in you." Yukinoshita Yukino snorted coldly.

"Leave this question aside for the time being, your breathing method just now is different from the traditional water breathing method?"

"Well, you can see it too?"

"It's really unimaginable that it's an ordinary breathing method. In fact, the one you just did can completely cut the stone, but the knife can't stand it and breaks itself, and I can see that there is a thin layer of ice on the broken knife. In this weather You can also feel the abnormal cold, which is estimated to be below minus 40 degrees. Iron is solid at normal temperature. The so-called freezing is the water in the air condenses into ice and distributes on the outer surface of the iron. The so-called brittle, It is because iron has "cold brittleness", and reducing the sulfur and phosphorus content in iron can reduce cold brittleness and hot brittleness, but it is right that there is no such technology in this era."

The Saint of Longgong Temple also put the blade under two fingers, and put another finger on the blade, and then pinched it hard, and the broken blade was pinched into two pieces again.

"Hmm...why I can understand what you said, but I can't remember where I saw it?"

Yukinoshita Yukino rubbed her head and said in a puzzled way.

"This is something I heard from a Western scholar. You must have heard the same thing somewhere. It is too complicated, and you must not understand it. Simply put, low temperature will Let the iron become more brittle, and the position where you cut the knife happens to be the hardest part of the stone structure, so the knife is broken. In this way, even if you get the sun wheel knife, you will die because you can't stand the response of this breathing method. Break, you can't fight ghosts like this."

The Saint of Longgong Temple also held the blade in his hand and said calmly.

"What exactly do you want to say?" Yukinoshita Yukino asked with some doubts.

"You teach me this breathing method, and I'll help you build a cold-resistant sword."

The Saint of Longgong Temple also spoke.

The performance of metals at low temperatures is different from that at room temperature.

In an ultra-low temperature state, knocking a heavy lead bar will make a sound like a copper bell, liquid nitrogen and mercury will freeze as hard as steel, and the strength of low-carbon steel will increase exponentially... Almost all metals are stronger than them at ultra-low temperatures It's much higher at room temperature, and of course strength isn't everything.

Although the strength of diamond is very high, its toughness is not good.

It won't deform, but it will break.

The structure will change, and the "hardness" and "brittleness" of the metal are always inseparable. Although the strength and hardness of the metal increase at low temperature, the toughness is greatly reduced, that is to say, the metal becomes "brittle".

People call the phenomenon that the toughness and plasticity of metals decrease with the decrease of temperature as "cold brittleness".The cold brittle fracture of metal is basically the same as the brittle failure state at room temperature. It often occurs suddenly when there is no obvious plastic deformation, the fracture is smooth and bright, and the cracks generally originate from defects or stress concentrations in the metal structure. spread.Once it happens, it can bring down the whole structure in an instant.

Metals and alloys are composed of countless small crystals, and crystals are formed by stacking atoms in a certain way.The accumulation of metal atoms follows a specific form, which is regularly repeated.

Cold brittleness at low temperature is mainly for metals with body-centered cubic lattice, followed by metals with close-packed hexagonal lattice.As the temperature decreases, their strength indicators (such as yield limit and strength limit) increase, and their plasticity and toughness indicators (such as impact toughness and elongation) decrease, showing brittle properties.In contrast, metals with face-centered cubic lattices do not undergo cold and brittle failure, the temperature decreases, the strength index increases somewhat, and the toughness and plasticity indexes remain unchanged or slightly increase.

If you want to make the knife used by Yukinoshita Yukino, you really need a certain technique, and you have to add the material of the sun wheel knife to it, so the difficulty of making it has increased a lot.

It is estimated that the people in the swordsmith village can't make this kind of knife.

Yukinoshita Yukinai, although he didn't know what was going on, he could probably guess that his own Japanese knives were probably not easy to make.

Although the low temperature can delay the regeneration of ghosts, it cannot cause effective damage to ghosts. Even if their heads are cut off, they can still live.

Yukinoshita Yukino is still far behind in the Ghost Killing Team. If he doesn't overcome this point, the teacher probably won't let him out.

but……

Her breathing method is not so easy to learn.

When that bastard brother-in-law was talking, she didn't know why he remembered it.But even if he wanted to pass it on to others, after listening to the pair of mantras, none of the brothers and sisters could do it.

"Okay... But whether you can learn it is your own business. If you can't learn it, I don't want to take advantage of you. If you learn it, then I will entrust you with my knife. You have to remember Compliance with commitments."

Yukino under the snow bowed her head and pondered for a while, then raised her head and said to Shengya Longgong Temple.

"Hmm... don't worry, whether it's the breathing method or the knife."

I don't know why Yukinoshita Yukino saw the shadow of another person in Ryuguji Shengya.

Chapter 194 Perfect preparation