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施压熔体温度对挤压铸造Al-5.0Cu-0.6Mn-0.5Fe合金组织和性能的影响
作者:石 亚   作者单位:华南理工大学   期刊:特种铸造及有色合金
关键字:   出版单位:特铸杂志社

作者简介

中文摘要

摘要:采用拉伸性能测试、定量金相分析、扫描电镜等手段,研究施压熔体温度对挤压铸造Al-5.0Cu-0.6Mn-0.5Fe-0.1Ti-0.1RE合金微观组织和力学性能的影响。结果表明,在547~650 ℃的液固两相区,随着施压熔体温度的升高,合金的抗拉强度和伸长率缓慢增加。当施压熔体温度为650 ℃时,合金获得较高的综合力学性能,抗拉强度为299 MPa,伸长率达到17.5%。这主要与压力下发生凝固的液相增多导致的αAl二次枝晶间距、第二相体积分数、铸造缺陷体积分数减小,以及“双峰组织”中的小晶粒组织体积分数增大有关。

关键词 :铝合金;挤压铸造;施压熔体温度;微观组织;力学性能

 

中图分类号:TG146.21;TG249.2 文献标志码A   DOI:10.15980/j.tzzz.2018.07.011

英文摘要

Effects of Squeezing Melt Temperature on Microstructure and Mechanical Properties of Al-5.0Cu-0.6Mn-0.5Fe Alloy Prepared by Squeeze Casting

Shi Ya1, Wang Zhi1, Luo Zongqiang1, Lin Bo2, Zhang Weiwen1

(1.School of Mechanical and Automotive Engineering, South China University of Technology;2. School of Mechanical Engineering, Guizhou University)

Abstract:Effects of squeezing melt temperature on microstructure and mechanical properties of Al-5.0-Cu-0.6Mn-0.5Fe-0.1Ti-0.1RE alloy prepared by squeeze casting were investigated by tensile test, image analysis and scanning electron microscope. The results show that with the squeezing melt temperature of 650 , the ultimate tensile strength and elongation of the alloy reach 299 MPa and 17.5%, respectively, while those of the alloy are increased slightly with the squeezing melt temperature from 590 to 650 , which can be attributed to the decrease of the dendritic arm spacing of αAl phase, the second intermetallic phases, the volume of casting defects and the increase of volume fraction of fine structure in bimodal structure resulted from the increase of solidification liquid phase under applied pressure.

Key Words:Aluminum Alloy, Squeeze Casting, Squeezing Melt Temperature, Microstructure, Mechanical Properties

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