温度对6101铝合金导线拉伸性能的影响

研究了6101铝合金单股导线在-70℃到70℃温度区间的拉伸性能。结果表明，6101铝合金导线在-70℃低温下具有较高的强度和较好的变形均匀性，但是随着变形温度的提高其屈服强度和强度极限都呈下降趋势。与在-70℃的拉伸性能相比，在70℃合金的强度极限和屈服强度分别降低了10.9%和9.3%。对应变硬化率和屈服强度与温度的相关性分析发现，在拉伸变形过程中合金样品的应变硬化率随着流变应力的增大和温度的升高呈下降趋势。晶格摩擦阻力极大的影响了合金的屈服强度，对比不同温度下6101合金的屈服强度增量的拟合计算结果与实验结果，得到了这种导线屈服强度增量与温度的关系，据此可预测此类导线在不同温度下的服役可靠性。

Effect of Temperature on Tensile Properties of 6101 Al-alloy Wires

Tensile properties of a single-strand conductor of 6101 Al-alloy were investigated in the temperature range from -70℃ to 70℃. It is found that the 6101 Al-alloy wire has high strength and good deformation uniformity at the low temperature (-70℃). However, the yield strength and the ultimate tensile strength of the alloy exhibited a decreasing trend with the increasing testing temperature. The ultimate tensile strength and the yield strength of the alloy at 70℃ decreased by 10.9% and 9.3%, respectively, comparing with those of the counterparts tested at -70℃. From the analysis on the correlation of the work hardening rate and the yield strength with the temperature, it is found that the strain hardening rate of the alloy decreased with the increasing flow stress and the raising temperatures. In addition, the lattice friction stress has a strong correlation with temperature, which is the main factor affecting the yield strength of the alloy. Based on the comparison of the fitting calculated increment of the yield strength of the alloy to the corresponding experimental results, a model about the relation between the yield strength of the alloy and the service temperature was obtained, by which the appropriate yield strength of the alloy at different service temperatures can be predicted.