Cu47Ti34Zr11Ni8块体非晶合金的热稳定性和力学性能

Thermal stability and mechanical properties of Cu47Ti34Zr11Ni8 bulk amorphous alloys

采用差压铸造法成功制备了Cu47Ti34Zr11Ni8块体非晶合金,研究了其热稳定性和力学性能。结果表明:=735K,过冷液相区ΔTx=63K,约化玻璃温度Trg=0.该块体非晶合金的玻璃转变温度Tg=672K,晶化温度Tx1575,弯曲断裂强度高达2350MPa,断裂前弹性变形量为2.1%,弯曲模量为102GPa;淬态微米级结晶相的出现使合金的三点弯曲断裂强度下降至1100MPa。

Cu47Ti34Zr11Ni8 bulk amorphous alloy was prepared by differential pressure casting. Thermal stability and mechanical properties were studied. The results show that the glass transition temperature(T_g), crystallization temperature(T_x_1), temperature interval of supercooled liquid region ΔT_x(=T_x_1-T_g) and reduced glass transition temperature(T_rg) are proved to be 672 K, 735 K, 63 K, and 0.575, respectively. The bulk glass also exhibits high three point-bending flexural strength of 2 350 MPa, flexural modulus of 102 GPa and fracture strain of 2.1%. The three point-bending flexural strength of the alloys declines to 1 100 MPa with the appearance of a micron-size quenched-in crystallization.