稀土Gd掺杂对锆基块体非晶合金玻璃形成能力及力学性能的影响

EFFECT OF Gd ADDITION ON THE GLASS FORMING ABILITY AND MECHANICAL PROPERTIES IN A Zr-BASED BULK AMORPHOUS ALLOY

适量的Gd掺杂可提高Zr_(50.7)Cu_(28)Ni_9Al_(12.3)块体非晶合金的玻璃形成能力,当Gd元素掺杂量(原子分数)为1%时,即(Zr_(50.7)Cu_(28)Ni_9Al_(12.3))_(99)Gd_1,柱状非晶合金直径可达16 mm(不掺杂时为14 mm).稀土Gd掺杂降低了锆基块体非晶合金的断裂强度与塑性变形能力.随着Gd含量的增加,其断裂方式由单一的剪切断裂转变为剪切断裂与破碎断裂的复合形式,且含Gd元素掺杂的非晶合金断口呈现了脉状纹络与纳米周期性条纹共存的特征.

The glass forming ability （GFA） of a newly developed Zr50.7Cu28Ni9Al12.3 alloy can be improved by minor addition of Gd element, for example, the amorphous alloy Zr50.7Cu28Ni9Al12.3 has a critical diameter of 14 mm, but the alloy added by 1%Gd （atomic fraction）, （Zr50.7Cu28Ni9Al12.3）99Gd1, has 16 mm critical diameter. However, the Gd addition decreases the fracture strength and plastic strain under compressive condition. Meanwhile, with Gd addition increasing, the fracture mode transforms from pure shear to shear with hysterical failure. A combination of vein pattern and nanoscale corrugations can be clearly observed on the fracture surfaces of the alloys with Gd addition.