7050铝合金均匀化工艺的确定
Determination of Homogenization Process of 7050 Aluminum Alloy
摘 要
利用差示扫描量热仪、光学显微镜、电子探针、扫描电镜和电子万能试验机等对铸态7050铝合金在不同条件均匀化后的显微组织与力学性能进行了分析,以确定均匀化工艺.结果表明:7050铝合金经465 ℃保温24 h直接在室温水中冷却的均匀化处理后,其铸态组织中的不平衡共晶相转变为均匀化组织,合金成分分布均匀性有了较大改善,其伸长率达到13.1%,抗拉强度达到292.08 MPa.
均匀化
力学性能
7050 aluminum alloy
homogenization
mechanical property
Abstract
The microstructure and mechanical properties of as-cast 7050 alloy homogenized under different conditions were studied by means of DSC,optical microscopy,EPMA,SEM and electronic universal testing machine.The homogenization process was determined.The results show that when the 7050 alloy was homogenized at 465 ℃ for 24 h,and then cooled in water at room temperature,the disequilibrium eutectic phase in the as-cast microstructure of the alloy transformed to homogenous microstructure,the element distribution was improved obviously,the elongation reached to 13.1% and the tensile strength reached 292.08 MPa.
中图分类号 TG146.21
所属栏目 新材料 新工艺
基金项目 国家自然科学基金资助项目(50674018)
收稿日期 2008/8/1
修改稿日期 2009/4/6
网络出版日期
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备注刘吉东(1983-),男,辽宁大连人,硕士研究生.
引用该论文: LIU Ji-dong,CAO Zhi-qiang,ZHANG Hong-liang,LI Ting-ju,WANG Jia-chun. Determination of Homogenization Process of 7050 Aluminum Alloy[J]. Materials for mechancial engineering, 2009, 33(8): 32～35
刘吉东,曹志强,张红亮,李廷举,王家淳. 7050铝合金均匀化工艺的确定[J]. 机械工程材料, 2009, 33(8): 32～35
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【7】金相图谱编写组.变形铝合金金相图谱[M].北京:冶金工业出版社,1975:156-166.
【8】HAHN G T,ROSENFIELD A R.Metallurgical factors affecting fracture toughness of aluminum alloys[J].Metall Trans A,1975,6A:653-659.
【9】NAKAI M,ETOH T.Effect of the morphology of constituents and dispersoids on fracture toughness and fatigue crack propagation rate in 2024 aluminum alloys[J].Journal of Japan Institute of Light Metals,1995,45:677-683.
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【11】宁爱林,曾苏民.强化均匀化对7B04铝合金铸态组织与性能的影响[J].热加工工艺,2003(6):5-7.
【12】ROBSON J D.Microstructural evolution in aluminium alloy 7050 during processing[J].Materials Science and Engineering A,2004,382:112-121.
【13】MCQUEEN H J,CELLIES O C.Application of hot workability studies to extrusion processing.PartⅢ:physical and mechanical metallurgy of Al-Mg-Si and Al-Zn-Mg alloys[J].Canadian Metallurgical Quarterly,1997(2):73-86.
【14】胡赓祥,蔡珣.材料科学基础[M].上海:上海交通大学出版社,2000:119-120.
【15】孙凤仙,高凤华.Al-6.1Zn-2.6Mg-1.6Cu超高强铝合金铸锭均匀化处理研究[J].轻合金加工技术,2007,37(1):16-19.
【16】刘晓涛,崔建忠.铝合金均匀化扩散动力学研究[J].材料导报,2004,18(6):102-104.
【17】贺永东,张新明,游江海.7A55合金均匀化处理[J].中国有色金属学报,2006,16(4):638-644.
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