Zr的替代对快冷Ti合金组织与力学性能的影响

Influnce of Zr Replacement on Microstructure and Mechanical Properties of Ti Alloys by Rapid Cooling

通过铜模铸造法制备出了直径为3mm的Ti66.7-xNi20Cu13.3Zrx(x=0、10、30)合金圆柱棒。利用X射线衍射(XRD)仪和扫描电子显微镜(SEM)等研究了Zr的替代对Ti66.7-xNi20Cu13.3Zrx(x=0、10、30)(原子百分比)合金组织与力学性能的影响。结果表明:未替代Zr(x=0)时,形成Ti基非晶复合材料,塑性应变量达4.8%,同时最大应力达到1756MPa;Zr的替代使合金析出脆性相,导致试样破坏性脆断。

The alloys rods with diamters of 3.0mm of Ti66.7-xNi20Cu13.3Zrx（x=0、10、30） have been prepared by copper die casting method.The influnce of Zr element replacement on the microstructure and the mechanical properties of Ti66.7-xNi20Cu13.3Zrx（x=0、10、30）（at%） alloys have been investigated mainy by means of X-ray diffraction（XRD） and scanning electric microscopy（SEM）.It was shown that Ti-based amorphous composites were formed without Zr（x=0）,the maximum stress and plastic strain of the composite are as high as 1756Mpa and 4.8%;The alloys precipitate brittle phase because of the Zr replacement,which causes the samples destructive fault by brittle fracture.