What makes the nanocrystalline alloy's unique

Nanocrystalline soft magnetic metals was invented by the Japanese, by Hitachi metals. Although some people say that they have invented a coincidence, but is not the goal, the researchers in their work is the most noble is worth our respect. Work within the amorphous material of "quench" players are German VACUUMSCHMELZE GMBH&CO KG accepted the challenge, they are one of the researchers, Dr HERZER who won the race, explain in detail of what makes this unique nanocrystalline alloy, etc., and the special. I'd like to quote Petzold, Ph.D., who is in VACUUMSCHMELZE another researcher, he said: "due to its high degree of reliability in the process of production, is the most outstanding representatives of the family amorphous alloy. This kind of new material FeCuNbSiB HERZER Dr Because it has been pointed out, these materials are quasi isotropic magnetic ultrafine grain's average diameter is about 10 ~ 15 nm first in 500-600 ℃ in the amorphous matrix produced during annealing treatment under this will lead to disappear magnetocrystalline anisotropy. As such particles are far less than the width of the magnetic domain wall, also have a domain wall movement as a result, will not interfere with the nail pierced by the grain boundary. A direct consequence of nanocrystalline phase structure is fairly low magnetostrictive lambda S < 10 PPM, this is far lower than in the cold snap is still amorphous state. 5 b7 in some ingredients such as FebalCu1Nb3Si15, and even zero magnetostriction can get highly sensitive magnetic properties of internal and external pressure."

May be the last few words sound a bit too specialized for a non-technical dilettante person, so let me try to restructure into "management version" (though it may still be too complex top management ) :

Through the use of a special kind of rapid quenching technology for the production of nanometer metal amorphous metal. The molten body within one over one thousand of a second cooling into solid state. To achieve this, the shape of the final material of one-dimensional, fast enough to get heat material must be small. Therefore, amorphous strips are usually less about 0025 mm thickness.

Like amorphous strips of nanocrystals with initial amorphous. In view of the amorphous alloy lose their good magnetic properties, and the temperature about 500 ℃, increase the crystallization of the magnetic properties of nanocrystalline materials, the temperature about 600 ℃, the crystallization

After proper annealing, nanometer material development within the scope of the grain in the amorphous matrix (guess what gave their names...... the city, right!). Small coarse cereals are often counterproductive, excellent soft magnetic behavior, unless they are small 10-15 nm (this is not the "normal" production crystal under the condition of soft magnetic materials). Magnetic seems to be a bit shortsighted, grain become invisible "magnetic", if they only have small enough (see figure 2).

"Nano" Fe base material is highly "magnetostrictive" before annealing and crystallization. However, this is really exciting: if it is within a certain range of composite and annealing conditions, and then in the nanometer grain is magnetostrictive completely cancelled negative magnetostriction in the amorphous matrix. This gives a zero magnetostrictive alloy, with Fe, more expensive Co based amorphous or crystalline alloy permalloy (80% nickel iron) of similar nature, but has the high temperature stability of the magnetic flux density and better.