应变速率对锆基非晶复合材料力学性能的影响

Effects of Strain Rates on Mechanical Properties of Zr-based Bulk Metallic Glass Composites

采用铜模吸铸法制备出直径3mm的[Zr0.72+x(Cu0.59Ni0.41)0.28-x]88Al12(x=0.05、0.10)棒状非晶复合材料。考察应变速率对合金压缩力学性能的影响。结果表明,随应变速率的增大,合金的塑性变形区域减小,锯齿流变现象逐渐消失;在相同成分下,随应变速率的增大,弹性模量逐渐升高,塑性应变和抗压强度则逐渐降低,屈服强度和断裂强度也基本呈下降趋势。在x=0.05、应变速率为0.55×10-4s-1时,塑性应变、抗压强度和断裂强度均为最大值,分别为6.77%、1 758MPa和1 629MPa。

[Zr0. 72＋x （Cu0.59 Ni0.41 ）0. 28-x ]88 Al12 （x = 0.05,0.10） bulk amorphous composites rods with the diameters of 3 mm were prepared by copper mold casting technique. The effects of strain rates on mechanical properties of amorphous composites were studied. The results show that plastic strain and serrated flow decreases with rise of strain rate. Under the same alloy composition, elasticity modulus enhances with rise of strain rate, while plastic strain and compressive strength decrease. On the whole, yield strength and fracture strength also decrease. The plastic strain, compressive strength and breaking strength reaches the maximum value which is 6.77%, 1 758 MPa and 1 629 MPa, respectively under the conditions of x=0.05 and strain rate of 0. 55 X 10-4 s^- 1.