非晶复合材料中析出相对力学性能的影响

Effect on Precipitated Phase in Amorphous Composites on Mechanical Properties

不同强化相的组织特征不同可能导致材料不同的力学性能.利用高真空电弧炉制备(Cu50Zr50)100-xAlx非晶复合材料,并采用XRD、SEM等对材料进行表征,研究析出相B2-Cu Zr相的含量及分布状态对非晶复合材料压缩后力学性能的影响.非晶复合材料基体中适量弥散分布的B2-Cu Zr相可有效提高非晶复合材料的屈服强度和压缩塑性,直径3 mm的(Cu50Zr50)97Al3屈服强度已达到2 200 MPa,并能产生23%的压缩塑性.这主要是由于非晶复合材料基体中的析出相B2-Cu Zr相会阻碍剪切带扩展,使剪切带分叉成多剪切带,实现了多剪切带的相互作用,从而使其具有更大的屈服强度和更显著的塑性应变.

Different strengthening phase, due to its organizational characteristics, will lead to different mechanical proper-ties. High vacuum electric arc furnace was employed to prepare（Cu50Zr50）100-xAlxamorphous composite materials, andX-ray diffraction（XRD） and scanning electron microscope（SEM） were adopted to characterize the structure-activity rela-tionship. The effect of content and distribution state of B2-Cu Zr phase on mechanical properties of amorphous compositesafter compression was investigated in detail. The results show that moderate and diffuse distribution of B2-Cu Zr phase inthe amorphous matrix can effectively improve the yield strength and compression plasticity of amorphous composites. The（Cu50Zr50）97Al3 amorphous composite material with a diameter of 3 mm has showed excellent mechanical properties undercompression, including high yield strength of 2 200 MPa with plasticity of 23% and significant work-hardening. It ismainly because the primary phase B2-Cu Zr which disperses in the amorphous matrix could hinder shear band propoga-tion, resulting in mulitiple shear bands and leading to strong interaction between shear bands, which gives rise to highyield strength and large plastic strain.