熔体过热处理对Al-6.34Mg-3.66Si合金中Mg<sub>2</sub>Si相形貌和力学性能的影响

王鑫; 姜峰; 刘祥玲; 牛玉; 王毅坚

doi:10.15980/j.tzzz.2020.10.021

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熔体过热处理对Al-6.34Mg-3.66Si合金中Mg₂Si相形貌和力学性能的影响
Effects of Melt Superheat Treatment on Microstructure and Mechanical Properties of Mg₂Si Phase in Hypoeutectic Al-6.34Mg-3.66Si
2020年40卷第10期页码：1139-1143
纸质出版日期： 2020 ，
DOI： 10.15980/j.tzzz.2020.10.021

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[1]王鑫,姜峰,刘祥玲,牛玉,王毅坚.熔体过热处理对Al-6.34Mg-3.66Si合金中Mg_2Si相形貌和力学性能的影响[J].特种铸造及有色合金,2020,40(10):1139-1143.

Wang Xin, Jiang Feng, Liu Xiangling, et al. Effects of Melt Superheat Treatment on Microstructure and Mechanical Properties of Mg₂Si Phase in Hypoeutectic Al-6.34Mg-3.66Si[J]. Special Casting & Nonferrous Alloys, 2020,40(10):1139-1143.
[1]王鑫,姜峰,刘祥玲,牛玉,王毅坚.熔体过热处理对Al-6.34Mg-3.66Si合金中Mg_2Si相形貌和力学性能的影响[J].特种铸造及有色合金,2020,40(10):1139-1143. DOI： 10.15980/j.tzzz.2020.10.021.

Wang Xin, Jiang Feng, Liu Xiangling, et al. Effects of Melt Superheat Treatment on Microstructure and Mechanical Properties of Mg₂Si Phase in Hypoeutectic Al-6.34Mg-3.66Si[J]. Special Casting & Nonferrous Alloys, 2020,40(10):1139-1143. DOI： 10.15980/j.tzzz.2020.10.021.

摘要

亚共晶Al-6.34Mg-3.66Si铝合金多用于轻量化材料的加工生产

但粗大的汉字状Mg

Si相会严重地割裂Al基体。研究了熔体过热温度和过热时间对亚共晶Al-6.34Mg-3.66Si组织及力学性能的影响

确定了最佳熔体过热工艺。结果表明

当过热温度为850℃、保温时间为25min时

初生α-Al晶体由鱼骨状枝晶转变为细小的等轴晶

粗片状Mg

Si相完全转变成细纤维状

且分布均匀

共晶Mg

Si相尺寸从3.02μm下降到0.97μm

较原始合金共晶Mg

Si尺寸减小了67.9%

抗拉强度较原始合金提高了34.4%

断裂方式由原来的脆性断裂转变为韧脆混合的断裂方式

表现出较好的塑性。

Abstract

The hypoeutectic Al-6.34Mg-3.66Si is mainly used in the light-weight materials

however

the coarse Chinese script Mg

Si phase will seriously fracture the Al Matrix.Therefore

the effect of melt superheating temperature and time on the microstructure and mechanical properties of hypoeutectic Al-6.34Mg-3.66Si was investigated.The results show that with the superheat temperature at 850 ℃ for 25 min

the primary-Al phase is changed from fishbone-like dendrite to fine equiaxed crystal

and the thick lamellar Mg

Si is completely changed into fine fibrous with uniform distribution.The size of Mg

Si is decreased from 3.02μm to 0.97μm

which is 67.9% smaller than that of the original alloy.The tensile strength is increased by 34.4%

and the fracture mode is converted from the original brittle fracture to the combined one

presenting good plasticity.

关键词

亚共晶Al-6.34Mg-3.66Si熔体过热组织力学性能

Keywords

Hypoeutectic Al-6.34Mg-3.66SiMelt SuperheatingMicrostructureMechanical Properties

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熔体过热处理对Al-6.34Mg-3.66Si合金中Mg2Si相形貌和力学性能的影响

Effects of Melt Superheat Treatment on Microstructure and Mechanical Properties of Mg2Si Phase in Hypoeutectic Al-6.34Mg-3.66Si

DOI： 10.15980/j.tzzz.2020.10.021

摘要

Abstract

关键词

Keywords

references

熔体过热处理对Al-6.34Mg-3.66Si合金中Mg₂Si相形貌和力学性能的影响

Effects of Melt Superheat Treatment on Microstructure and Mechanical Properties of Mg₂Si Phase in Hypoeutectic Al-6.34Mg-3.66Si