不同Mg、Si质量比对压铸铝合金组织与性能的影响
发布时间：2018-11-26 11:12
【摘要】：研究了Mg、Si质量比对Al-4Mg-xSi-0.6Cr合金组织和性能的影响。结果表明,未加入Si时,Mg主要固溶于α-Al基体中,少量形成颗粒状的Al_3Mg_2相,综合力学性能好。随着Si的加入,Mg主要与Si形成Al-Mg_2Si共晶组织,合金强度显著提高,但是塑性急剧下降。Mg、Si元素质量比减小导致Al-Mg_2Si共晶组织层片间距增大,形貌变为带有尖端的凹多边形,容易在拉伸过程中形成应力集中,加速合金断裂。当Mg、Si质量比减小到1.6时,继续提高Si含量,Mg_2Si相的数量不再增加,但是有长条状共晶Si生成,强化合金的同时使合金的塑性进一步降低。含Cr相的种类和形貌与Mg、Si元素质量比有关,过剩Mg时Cr元素以大块状Al13Cr2相存在,过剩Si时Cr元素以不规则状Al5(Cr,Fe)Si相均匀分布。
[Abstract]:The effect of Mg,Si mass ratio on the microstructure and properties of Al-4Mg-xSi-0.6Cr alloy was studied. The results show that when Si is not added, Mg is mainly solid solution in 伪-Al matrix, a small amount of granular Al_3Mg_2 phase is formed, and the comprehensive mechanical properties are good. With the addition of Si, Mg formed Al-Mg_2Si eutectic structure mainly with Si, the strength of the alloy increased significantly, but the plasticity decreased sharply. The decrease of Mg,Si element mass ratio resulted in the increase of the interlamellar spacing of Al-Mg_2Si eutectic microstructure. The morphology of the alloy becomes concave polygon with tip, which is easy to form stress concentration in the tensile process and accelerate the fracture of the alloy. When the mass ratio of Mg,Si decreases to 1.6, the amount of Mg_2Si phase does not increase when the content of Si continues to increase, but the long stripe eutectic Si is formed, which further reduces the plasticity of the alloy while strengthening the alloy. The type and morphology of the Cr phase are related to the mass ratio of Mg,Si elements. The Cr element exists as a large block Al13Cr2 phase when the Mg is excess, and the Cr element distributes uniformly in the irregular Al5 (Cr,Fe) Si phase in the excess Si phase.
【作者单位】： 上海汽车集团股份有限公司技术中心;上海交通大学材料科学与工程学院;
【基金】：上海汽车工业发展基金资助项目(1519)
【分类号】：TG146.21;TG249.2
[Abstract]:The effect of Mg,Si mass ratio on the microstructure and properties of Al-4Mg-xSi-0.6Cr alloy was studied. The results show that when Si is not added, Mg is mainly solid solution in 伪-Al matrix, a small amount of granular Al_3Mg_2 phase is formed, and the comprehensive mechanical properties are good. With the addition of Si, Mg formed Al-Mg_2Si eutectic structure mainly with Si, the strength of the alloy increased significantly, but the plasticity decreased sharply. The decrease of Mg,Si element mass ratio resulted in the increase of the interlamellar spacing of Al-Mg_2Si eutectic microstructure. The morphology of the alloy becomes concave polygon with tip, which is easy to form stress concentration in the tensile process and accelerate the fracture of the alloy. When the mass ratio of Mg,Si decreases to 1.6, the amount of Mg_2Si phase does not increase when the content of Si continues to increase, but the long stripe eutectic Si is formed, which further reduces the plasticity of the alloy while strengthening the alloy. The type and morphology of the Cr phase are related to the mass ratio of Mg,Si elements. The Cr element exists as a large block Al13Cr2 phase when the Mg is excess, and the Cr element distributes uniformly in the irregular Al5 (Cr,Fe) Si phase in the excess Si phase.
【作者单位】： 上海汽车集团股份有限公司技术中心;上海交通大学材料科学与工程学院;
【基金】：上海汽车工业发展基金资助项目(1519)
【分类号】：TG146.21;TG249.2
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