SDAS 对A357合金时效过程的影响

来源期刊：有色金属科学与工程2010年第2期

论文作者：王友彬 潘杰花 胡治流 曾建民

文章页码：30 - 33

关键词：A357合金;二次枝晶臂间距;时效动力学

Key words：A357 alloy; second dendrite arm spacing; aging kinetics

摘    要：铸造Al- Si-Mg合金是典型的可热处理强化铝合金，二次枝晶臂间距(SDAS)对合金力学性能有非常显著的影响，研究SDAS对合金时效动力学的影响有重要意义，采用硬度计进行力学性能测试、光学显微镜分析金相组织，研究了SDAS对A357合金时效动力学的影响，研究发现，在相同的固溶处理条件下，随着A357合金试样二次枝晶臂间距的增大，固溶处理后达到的硬度值减小；不同壁厚的合金试样的时效峰随SDAS增大而延后：对时效处理实验结果进行回归分析和量纲分析，得到时效力学性能的数学模型，并证明了该数学模型的有效性．

Abstract:

The Al-Si-Mg alloy is a kind of casting aluminum alloy that can be strengthened by heat treatments.Second dendrite arm spacing (SDAS) has great influence on the mechanical properties of alloy. Therefore,research on the influences of SDAS on aging kinetics of A357 alloy has great significance to increase its performances. This paper studies the influences of SDAS on aging kinetics of A357 Alloy with hardness tester and metallographic analysis with optical microscope. The results show that, under the same solution conditions, the hardness after solution treatment reduces with the SDAS's increasing; the ageing peaks lag with the increasing of SDAS.Regression analysis and dimensional analysis are employed to establish an equation, whose rationality is testified by following analysis.