almgsi基导体材料组织和性能的分析word格式论文.docxVIP

摘要保温 4h，合金出现过烧现象。当均匀化温度为 560℃，保温时间为 16 小时时，合金导电率达到最大值，为 55.6%IACS，比铸态合金导电率（43.1%IACS）提高 29.0%。当均匀化温度为 575℃时，保温时间为 9 小时时，合金导电率达到最大 值，为 55.5%IACS，比铸态合金导电率（43.1%）提高 28.7%。均匀化处理后， 合金抗拉强度降低，伸长率升高。560℃均匀化处理 16h，合金抗拉强度为 153MPa，伸长率为 13.1%，575℃均匀化处理 9h，合金抗拉强度为 166MPa ， 伸长率为 13%。挤压后的 Al-0.96Mg-0.6Si-0.05B-0.3Re-0.03Sr 合金，晶粒在应力作用下被拉 长，沿挤压方向有较明显的方向性。晶界处的粗大第二相，发生破碎，并沿挤 压方向分布。冷拉后，晶粒呈明显的纤维状。350℃中间退火后，显微组织变化 不明显。中间退火的铝合金导线较未退火的铝合金导线导电率和抗拉强度有所 降低，伸长率有所升高。合金线的抗拉强度随着时效时间的延长，先增大后减 小。时效温度越高，合金线强度峰值越大，达到峰值所需时间越短。合金线的 导电率，随着时效温度的增加，和时效时间的延长，逐渐增大。最佳固溶、时 效参数为：550℃固溶处理 0.5h，空冷，200℃时效处理 12h。此时铝合金导线性 能最佳，抗拉强度、伸长率和导电率分别为 294MPa，10%，53.9%IACS。 关键词：Al-Mg-Si 合金元素 均匀化处理 显微组织 力学性能 导电率IIAbstractConductor materials not only have a good electrical conductivity, but also have good strength to support their own weight and external natural load. Al-Mg-Si alloy has good mechanical properties, so it is widely used in heavy icing area and long crossing lines. However Al-Mg-Si alloy has some problems, such as low electrical conductivity; Mg2Si phase is dendrite, which is bad for mechanical properties, especially ductility; coarse grains in cast microstructure, and mechanical properties is to be improved.In the paper, the addition of Rare earth, boron and strontium in the Al-Mg-Si alloy6201, 6101, is to improve the electrical conductivity. Orthogonal experiment is applied to optimize the composition of Al-Mg-Si-B-Re-Sr alloy. Electrical conductor, tensile strength and elongation are tested, and Al-0.96Mg-0.6Si-0.05B-0.3Re-0.03Sr alloy was prepared. Homogenize the alloy ingot at different temperatures, and research effect of homogenization on microstructure and properties, and determinethe best homogenization is 575℃，9h. After homogenization, aluminum alloy wirewas prepared by extrusion and drawing. Test the final properties of the wire after solid solution and aging.The result showed that, the influencing degree of each factor that affect electrical conductivity of the alloy is as follows: the ratio of magnes