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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γ2相析出;温度在490~510℃时,合金丝析出γ2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-Al-Be alloy wire was subjected to isothermal drawing test at different temperatures. The effect of drawing temperature on the microstructure, cyclic tensile properties and bending fatigue properties of the alloy wire was studied. The results show that when the deformation temperature is 450 ℃, strain induced martensite is produced in the alloyed wire. At 470 ℃, there is no martensite and γ2 phase precipitation in the alloyed wire. When the temperature is in the range of 490-510 ℃, γ2 phase precipitates The amount of precipitates increases as the deformation temperature increases. The residual strain of the alloy wire decreases first and then increases with the increase of the deformation temperature. When the deformation temperature is 470 ℃, the residual strain generated is the smallest. When the deformation temperature was 530,550 ℃, the sample appeared necking and fracture, the higher the deformation temperature, the lower the tensile strength of the alloy wire. The bending fatigue behavior of the alloy wire reaches the maximum at the deformation temperature of 470 ℃.