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有色金属工程:2020,(10):40-46
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熔体过热处理对Mg-5Si合金组织与性能的影响
武改林, 范晋平, 蒋一锋, 裴 镖, 郭丽娜
(太原理工大学 材料科学与工程学院)
Effect of Melt Superheating Treatmenton Microstructure and Properties of Mg-5Si Alloy
Wu Gailin, Fan Jinping, Jiang Yifeng, Pei Biao, Guo Lina
(College of Materials Science and Engineering,Taiyuan University of Technology)
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投稿时间:2020-02-27    修订日期:2020-03-18
中文摘要: 采用质量分数为99.9%的纯镁锭和99.9%的粒度为45μm的硅粉,制备了质量分数为5%的Mg-5Si合金,研究了熔体过热温度和保温时间对Mg-5Si合金铸态组织和力学性能的影响。研究实现了Mg2Si相尺寸由处理前的27μm减小到20μm,此时初生Mg2Si相的平均尺寸最小,分布趋于均匀,形貌逐渐向树枝状转变,甚至溶解为较为圆整的颗粒,且共晶Mg2Si相层片间距较小,并采用抗拉强度、屈服强度和伸长率表征其力学性能。研究结果表明:熔体过热温度为770℃、保温时间为30min时,合金的抗拉强度、屈服强度和伸长率分别为152MPa、84 MPa和6.5%,合金的力学性能得到明显改善。
中文关键词: 镁合金  Mg2Si  熔体过热温度  保温时间
Abstract:The Mg-5Si alloy with 5% mass fraction was made by using a pure magnesium ingot with 99.9% mass fraction and silicon powder with 99.9% mass fraction which particle size is 45μm. The effects of melt superheating temperature and holding time on casting structure and mechanical properties of Mg-5Si alloy were studied. The size of Mg2Si isdecreased from 27 μm to 20 μm and the average size of primary Mg2Si phase is the smallest. The morphology of primary Mg2Si phase gradually changes to dendrite, and even dissolves into some round particles with uniform distribution. The lamellar spacing of eutectic Mg2Si phase issmall. Furthermore, the tensile strength, yield strength and elongation were employed to characterize the mechanical properties. The result shows that when the melt superheating temperature is 770 ℃ and holding time is 30min, the mechanical properties of alloy are improved obviously and the tensile strength, yield strength and elongation of the alloy are 152 MPa, 84 MPa and 6.5% respectively.
文章编号:     中图分类号:TF;TG    文献标志码:
基金项目:山西省科技厅自然基金项目(2013011014-2)
引用文本:
武改林,范晋平,蒋一锋,裴 镖,郭丽娜.熔体过热处理对Mg-5Si合金组织与性能的影响[J].有色金属工程,2020,(10):40-46.

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