Abstract
Zr41Ti14Cu12.5Ni10Be22.5 bulk metallic glass (BMG) was annealed at 573 Kunder a high pressure of 3 GPa. The effects of the structural relaxations of BMGon its mechanical and acoustic properties are investigated by using x-raydiffraction, ultrasonic study, density measurements, compression testing, as wellas microhardness. It is found that high-pressure relaxation results in amicrostructural transformation in the BMG. A sample relaxed under highpressure exhibits 3% plastic strain compared with the crystallized form, and thecompression strength achieved, 1800 MPa, is improved by nearly 20% over thatfor the as-prepared sample; moreover, a BMG with relaxed structure exhibitsmarkedly different acoustic properties.
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