Thermal Analysis and Microstructures of Modified Grain-Refined Al-7Si-Mg Cast Alloy
Thermal Analysis and Microstructures of Modified Grain-Refined Al-7Si-Mg Cast Alloy
复制标题
变质细化Al-7Si-Mg铸造合金的热分析及显微组织
DOI：
10.1007/978-3-319-48179-1_57
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发表时间：
2012
影响因子：
6.3
通讯作者：
S. Alkahtani
中科院分区：
文献类型：
--
作者：
A. Mohamed;F. Samuel;S. Alkahtani
本文旨在研究不同级别的Sr变质A356.2合金与各种Al-Ti、Al-B和Al-Ti-B中间合金的晶粒细化响应。热分析用于评估 Sr 和 B 之间以及 Sr 和 Ti 之间的相互作用。使用光学显微镜和EPMA技术检查微观结构。在铸态和热处理条件下评估冲击性能。结果表明，添加高于 0.1% 的 B 会导致形成主要含有 B 和 Sr 的颗粒，例如 SrB6。 Sr-B相互作用可以推迟含0.02-0.1%B合金的晶粒细化。还观察到Al-Ti-B和Al-4%B类型中间合金对A356.2合金晶粒细化的影响比Al-10%Ti更大。对于较低水平的硼添加，合金的晶粒尺寸随着硼含量的增加而迅速减小。
This article aims to investigate the grain refining response of Sr-modified A356.2 alloy with various Al-Ti, Al-B and Al-Ti-B master alloys at different levels. Thermal analysis was used to evaluate the interactions between Sr and B, and between Sr and Ti. Microstructure was examined using optical microscopy and EPMA technique. Impact properties were evaluated for both as-cast and heat-treated conditions. The results reveal that adding B with levels higher than 0.1% leads to formation of particles containing predominantly B and Sr, such as SrB6. The Sr-B interaction may postpone grain refinement of the alloy containing 0.02–0.1%B. It is also observed that the Al-Ti-B and Al-4%B types of master alloy have a greater influence on the grain refining of the A356.2 alloy than does Al-10%Ti. The grain size of the alloy decreases rapidly with an increase in boron-content for the lower levels of boron addition.