Looking at the flying sword that turned into waste again, Zhou Yu thought about it. Although the experience will be improved faster by refining the flying sword for experiments, the formation diagram is too complicated, and his actions of forming magic tricks with both hands are too unfamiliar, so there will inevitably be mistakes.

He decided to practice the magic tricks by himself first, and then pierce the magic tricks into the flying sword. This would save a lot of time and avoid wasting materials.

So, Zhou Yu began to practice the formation diagram technique in front of the air, and refine the Wind and Thunder Sword based on the information sent from the radio. It not only builds a formation, but also requires several formations to merge with each other. There are formations that stimulate the power of wind and thunder, formations that increase the power of flying swords, and formations that enlarge and shrink.

In this way, after a week, he practiced every day and tried it with flying swords from time to time, making him more and more proficient in drawing array diagrams. Of course, he also practiced a lot of materials, and only one ton of materials left now is left.

Moreover, something happened during this period, that was, when he carved two formations and three more, the flying sword exploded directly. After analysis, he understood that this was because the materials used in the flying sword could not support the power of the formation.

Just like he carved a more advanced spirit gathering array on ordinary jade, the jade must not be able to withstand it. He now understands why the refining weapon needs to be integrated into other materials. That is because the different characteristics of the materials make the refined objects able to withstand more power of the formation.

This is also the reason why modern metal alloys are tougher than single metals. Next, he fused two different models of powdered steel together and added Huanglong jade at the same time. Sure enough, the degree of toughness increased and he could withstand two and a half-formats.

After understanding this truth, Zhou Yu did not buy other metals directly, but first penetrated into the flying swords one by one. After these formation techniques are proficient, he would consider adding other metals to refine the flying swords.

Through continuous experiments, he also discovered a poem that is of great help to his spirit and eyesight. After writing, the effect of the poem can help him concentrate more and his eyes become special. He can directly see through the formation composition inside the flying sword, and his reaction ability will also become faster, as if he stood at a higher position and watched his movements of portraying the formation.

After understanding the role of this poem, he also specially took out the Fenglei Sword and studied the construction and fusion of the array diagram inside, which made him more confident.

However, before refining the Wind and Thunder Sword, he had to go through the final experiment to ensure that each formation could be perfectly integrated into the flying sword. Now the materials he has cannot support these formations to be integrated together, so he had to buy some metal again to perform synthesis and refinement.

Through these flying swords to test the array diagram, you can still do it again if you are disabled. If you practice the Fenglei Sword, then he probably can only let the radio turn on the frequency again, rob Ren Tianba or Wu Dali, and let them take another flying sword.

After studying the metal elements for a while, suddenly, the sound of a radio appeared in his mind, pointing out several metals he wanted to buy, including the temperature and techniques of refining and fusion.

It seems that the radio senior still couldn't help but take the initiative. He just planned to ask, his purpose was to enter the world of fairy tales, and at the same time, the radio's strength will also be improved.

Zhou Yu looked at these metals and basically increased the toughness and strength of the steel, including the famous rare earth elements.

Looking at these metal elements, he smiled helplessly. It seemed that he still had to buy them through Qi Jinxuan. Not to mention other metals, rare earths alone, they can't be bought online.

After making a decision, Zhou Yu called Qi Jinxuan directly and explained the types of metal elements to be purchased on the phone.

Qi Jinxuan glared at his eyes and directly yelled out a national curse, "Damn, there are rare earths, you are not playing with knife, you are building missiles." Others use a knife at most, and at most, powder steel, and some other metals are added to form a **** effect. Zhou Yu plays with a knife, but he actually needs rare earths and so many metal elements.

"Well, Brother Qi, since I'm playing with a knife, it's different. I'm still experimenting now to see which metal is added to it. The knife made is the best. Just wait and see. When I succeed, the knife made will definitely be extraordinary. It's not a problem to cut iron like mud." Zhou Yu coughed twice and used the trick again.

Not to mention adding these elements, even the kitchen knife he made with powder steel and Huanglong jade can cut iron like mud, and even the bones of spirit beasts can be easily cut open, and iron blocks and the like cannot be stopped at all.

"Puff, you kid are crazy about playing with swords. You are really going to spend a lot of effort to study them." Qi Jinxuan couldn't help laughing. He was really unimaginable to add the rare earth knife.

"Brother Qi, if you give up halfway, your four tons of steel money will be wasted. I won't give it to you." Zhou Yu threatened half-jokingly.

"I'm convinced you, at least two knives. What elements do you want for rare earth? I see if I can get it for you." Qi Jinxuan shook his head helplessly and asked.

Rare earths have seventeen metal elements, and the functions of each element are different. Some of them contain very little content in rare earth ores, and the process of separation and extraction is even more complicated and difficult, and some elements may not be able to be able to do it.

So, Zhou Yu told Qi Jinxuan the two elements he needed. If he brought up the rare earth mine, he could extract it with Haoran Fire. There might be some problems before, but since he developed that poem, he could directly see the metal elements in the ore through his eyes.

"I don't know if these two elements can be obtained yet. I'll ask later. If possible, I'll give you a kilogram of each and how much other metals will cost." Qi Jinxuan said with some uncertainty. He knew the seventeen elements in rare earths, but he was not sure about the specific rarity.

"Hehe, thank you Brother Qi. Just make a few kilograms of other metals. I'll do the experiment." Zhou Yu said with a smile. These metals are auxiliary materials to help the steel become tougher, and powder steel should still be used as the main material.

"You guys, take advantage of your youth and have fun. Remember, you can succeed at least two knives, which are as sharp as mud." Qi Jinxuan laughed and scolded, thinking that Zhou Yu might be a young man and had a lot of fun, otherwise he would not have been able to study the knives suddenly. He was so whimsical that he wanted to add rare earths.

"Don't worry, Brother Qi, peeling iron like mud, blowing hair and cutting off hair, and the old man is not deceived." Zhou Yu assured confidently.
Chapter completed!