锻造热处理工艺对Al-7Si-1.6Cu合金组织和力学性能的影响
发布时间:2018-10-18 09:11
【摘要】:通过力学性能测试以及OM、SEM和TEM的组织观察,研究了锻造热处理工艺对Al-7Si-1.6Cu合金组织与力学性能的影响。结果表明,合金经过均匀化(500℃,8h)、锻造(锻造温度380~450℃,应变速率60~90s-1,道次压缩比10%~20%)、热处理(固溶480℃,2h,70℃,水冷;时效180℃,6h)之后,较铸态相比硬度提高18%、抗拉强度提高了52%、延伸率提高了54.5%。多向锻造过程中共晶Si相发生碎断与球化,时效过程中析出的纳米级第二相对合金起强化作用。开创性地从位错密度方向解释锻造过程强度提高的原因,通过Zener-Hollomon参数来说明锻造过程中流变应力与变形速率和变形温度之间的关系。
[Abstract]:The effect of forging heat treatment on the microstructure and mechanical properties of Al-7Si-1.6Cu alloy was studied by means of mechanical properties test and microstructure observation of OM,SEM and TEM. The results show that the alloy is homogenized (500 鈩,
本文编号:2278667
[Abstract]:The effect of forging heat treatment on the microstructure and mechanical properties of Al-7Si-1.6Cu alloy was studied by means of mechanical properties test and microstructure observation of OM,SEM and TEM. The results show that the alloy is homogenized (500 鈩,
本文编号:2278667
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