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首页> 外文期刊>Materials Science and Engineering >Effect of Mg content on age-hardening response, tensile properties, and microstructures of a T5-treated thixo-cast hypoeutectic Al-Si alloy
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Effect of Mg content on age-hardening response, tensile properties, and microstructures of a T5-treated thixo-cast hypoeutectic Al-Si alloy

机译：Mg含量对T5处理的Thixo-浇注的低蛋白合金的年龄 - 硬化响应，拉伸性能和微观结构

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摘要

Effect of Mg content on age-hardening response, tensile properties, and microstructures of a T5-treated thixo-cast Al-7wt.%Si-0.01wt.%Sr alloy has been investigated. The strengths of the T5-treated alloy increase with increasing the Mg content due to the dispersion of high density of needle-like precipitates (β" phases). Also, the addition of 1.0wt.% Mg results in the formation of evenly distributed fine Mg_2Si phases and Fe-rich compounds in the eutectic Si regions, and therefore, the Al-7wt.%Si-1.0wt.%Mg-0.01wt.%Sr alloy exhibits high 0.2% proof stress of 241 MPa and moderate elongation to failure of 5.1%, which are comparable to those of T6-treated gravity-cast Al-7wt.%Si-0.3wt.%Mg (ASTM A356) alloys. Although the addition of 1.5wt.% Mg or more further improves the strengths, the excess additions of Mg lead to the formation of coarse Mg_2Si phases. This causes significant loss of ductility, and the alloys show poor elongation to failure of ～2%.
机译：Mg含量对T5处理的Thixo-铸造Al-7wt的年龄硬化反应，拉伸性能和微观结构的影响。％Si-0.01wt。已研究％Sr合金。由于针状沉淀物（β“阶段的高密度的分散，增加了T5处理合金的强度随着Mg含量增加而增加。此外，添加1.0WT。％MG导致形成均匀分布的细菌Mg_2SI阶段和共晶Si区中的富含Fe的化合物，因此，Al-7wt。％Si-1.0wt。％Mg-0.01wt。％SR合金表现出高0.2％的抗度应力，241MPa和中等伸长率为失效5.1％，其与T6处理的重力铸造Al-7wt。％Si-0.3wt。％Mg（ASTM A356）合金。虽然添加1.5wt％。％镁或更大的进一步改善强度， Mg的过量添加导致粗mg_2SI相的形成。这导致显着的延展性损失，并且合金伸长率差至〜2％差。

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