柱状晶Cu-Al-Be合金丝等温拉拔试验研究

Experimental Research on Columnar Crystal Cu-Al-Be Alloy Wires Isothermal Drawing

对柱状晶Cu-Al-Be合金丝进行了不同温度的等温拉拔试验。研究了拉拔温度对合金丝金相组织、循环拉伸性能、弯曲疲劳性能的影响。结果表明：变形温度在450℃时，合金丝产生应变诱发马氏体；在470℃时，合金丝没有马氏体和12相析出；温度在490-510℃时，合金丝析出12相，且析出物的量随变形温度的上升而增加。合金丝的残余应变量随变形温度增加先减小后增大，变形温度为470℃时，所产生的残余应变最小。当变形温度为530、550℃时，试样出现缩颈而断裂，变形温度越高，合金丝的抗拉强度越低。合金丝的弯曲疲劳性能在变形温度470℃时达最大值。

The columnar crystal Cu-A1-Be alloy wire isothermal drawing experiment was carried out at different temperatures. The influences of drawing temperature on the metallurgical structure, cyclic tensile properties and bending fatigue properties of the alloy wire were researched. The results show that： alloy wire produces strain induced martensite at deformation temperature 450℃; the wire has no martensite and precipitation of T2 phase at 470℃; the wire produces T2 phase at 490-510℃, and the number of precipitations increases with the temperature rising. The residual strain of the wire decreases firstly and then increases with the temperature rising, and is minimum at deformation temperature 470℃. When deformation temperatures are 530℃ and 550℃, the specimens produce the necking and breaking. The higher the deformation temperature is, the lower the tensile strength of the alloy wire is. The bending fatigue property of the alloy wire reaches maximum at deformation temperature 470 ℃.