Block amorphous alloy amorphous alloy structure and the performance of the glassy state of material is the same, are metastable structures.
Its characteristic has spent nearly half a century of time in a different neighborhood was studied, with the preparation of amorphous material means perfect, people can shape rules size is prepared enough samples of amorphous alloy.
People will further study the mechanical properties of the amorphous alloy, the application in engineering.
Compared with the ordinary alloy, amorphous alloy materials with unique properties: 1, high elastic limit: in tension and compression is its elastic strain limit can amount to 2%, and the crystal material is less than 1%.
2, has the very high yield strength: up to about 2 gpa.
It with crystal materials tensile strength and yield strength is different, and yield strength is greater than the tensile strength of amorphous material, usually both occur at the same time.
3, fatigue performance: the crack propagation behavior similar to conventional ductile crystalline materials, namely,
Crack propagation rate depends on the applied stress intensity range, (
Load ratio and the crack closure effect similar to that of (
The fatigue fracture toughness meander to appear on the surface.
So the fatigue stress of bulk amorphous alloy and a different relationship with toughness and amorphous metal cycles, characterized by low fatigue life, to the dependence of the stress range small, 4% of the applied stress to tensile stress can only be observed when the fatigue limit.
4, high hardness of the amorphous material, atomic arrangement in the form of high density are stacked together, the generally high hardness, fracture toughness values of amorphous alloy reinforced aluminum alloy (KIC is higher than failure
, and commercial titanium alloy (
54 ~ 98 mpam1/2)
, which is about 60 ~ 70 MPam1/2.
In addition there are amorphous good stamping performance, superplasticity, good toughness and other mechanical properties.