超声处理对铸造7050铝合金热压缩变形行为的影响
Effect of Ultrasonic Treatment on Hot Compression Deformation Behavior of 7050 Cast Aluminum Alloy
摘 要
研究了超声处理对铸态及均匀化处理后7050铝合金显微组织的影响,并采用高温压缩模拟试验对在300～450 ℃、应变速率为2.77×10-4～2.77×10-2 s-1条件下常规与超声铸造7050合金均匀化后的塑性变形行为进行了研究.结果表明:相同条件热变形后,超声铸造铝合金的晶粒比常规铸造的细小;在相同变形条件下,超声铸造合金的流变应力明显要小;超声铸造合金的热变形激活能为136 kJ·mol-1,低于常规铸造的155 kJ·mol-1,更易热变形.
超声铸造
热变形
本构方程
7050 alloy
ultrasonic casting
hot deformation
constitutive equation
Abstract
The influence of ultrasonic treatment on the hot compression deformation behavior of as-cast and homogenized 7050 aluminum alloy was investigated.High temperature compression simulated test was carried out in the temperature range of 300-450 ℃ and strain rate of 2.77×10-4-2.77×10-2 s-1 to investigated the plastic deformation behavior of the ultrasonic cast 7050 alloy and conventional cast 7050 alloy after homogenizing.The results show that the grain size of the ultrasonic cast aluminum alloy was finer than that of the conventional aluminum alloy under the same deformation condition,and the flow stress of the ultrasonic cast alloy was obviously small.The hot deformation activation energy of the alloy after ultrasonic casting was 136 kJ·mol-1,which was smaller than that after conventional cast 155 kJ·mol-1,and the former was easier to deform.
中图分类号 TG292 TG156.99
所属栏目 试验研究
基金项目 国家“973”计划资助项目(2005CB23707)
收稿日期 2009/7/6
修改稿日期 2010/4/6
网络出版日期
作者单位点击查看
备注乔翔(1985-),女,湖北孝感人,硕士研究生.
引用该论文: QIAO Xiang,XIAO Yu-de,LIU Hua-shan,ZHANG Zhi-gao,CHEN Zhi-hong,XU Jian-qiu,PEI Fei,ZHOU Juan,LI Xiao-qian. Effect of Ultrasonic Treatment on Hot Compression Deformation Behavior of 7050 Cast Aluminum Alloy[J]. Materials for mechancial engineering, 2010, 34(9): 13～16
乔翔,肖于德,刘华山,张志高,陈志宏,徐建秋,裴斐,周娟,李晓谦. 超声处理对铸造7050铝合金热压缩变形行为的影响[J]. 机械工程材料, 2010, 34(9): 13～16
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参考文献
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【3】POLMEAR I J.A trace element effect in alloys based on aluminum-zinc-magnesium system[J].Nature,1960,186:303-304.
【4】ESKIN G I.Broad prospects for commercial application of the ultrasonic(cavitation) treatment of light alloys[J].Ultrasonics Sonochemistry,2001,12(1):319-325.
【5】WU M,ZHU P.PbTiO3 glass-ceramics[J].Non-Cryst Solids,1986,84:344-344.
【6】ESKIN G I.Broad prospects for commerical application of ultrasonic(cavitation) melt treatment of light alloys[J].Ultrasonics Sonochemistry,2001,83(2):319-325.
【7】ESKIN G I.Effect of ultrasonic(cavitation) treatment of the melt on the microstructure evolution during solidification of aluminum alloy ingots[J].Zeitschrift für Metallkunde,2002,93(6):502-507.
【8】关德林.晶体的高温塑性变形[M].大连:大连理工大学出版社,1989.
【9】ROBSON J D.A new model for prediction of dispersoid precipitation in aluminium alloys containing zirconium and scandium[J].Acta Mater,2004,52:1409-1421.
【10】SPIGARELLI S.Interpretation of creep behaviour of dispersion-strengthened Al-Fe-V-Si alloys in terms of detachment mechanisms:an overview[J].Mater Sci Eng A,2002,337:306-314.
【11】郑子樵.材料科学基础[M].长沙:中南大学出版社,2005.
【12】CERRIE,EVANGELISTAE,FORCELESSA,et al.Comparative hot workability of 7012 and 7075 alloys after different pretreatments[J].Mater Sci Eng A,1995,197(1/2):181-198.
【13】林高用,张辉,郭武超,等.7075铝合金热压缩变形流变应力[J].中国有色金属学报,2001,11(3):412-415.
【14】沈健.2091铝锂合金高温塑性变形行为的研究[D].长沙:中南工业大学,1996.
【15】YAO X X,ZAJAC S,HUTCHINSON B.The strain-rate sensitivity of flow stress and work-hardening rate in a hot deformed Al-1.0Mg alloy[J].J Mat Sci,2000,19:743-744.
【16】CASTOR-FEMANDEZ F R,SELLARS C M,WHITEMAN J A.Changes of flow stress and microstructure during hot deformation of Al-1Mg-1Mn[J].Mater Sci Technol,1990,6:453-460.
【17】SHI H,MCLAREN A J,SELLARS C M.Constitutive equations for high temperature flow stress of aluminum alloys[J].Mater Sci Eng A,1997,13(3):210-216.
【18】CHEN W.Gleeble system and application[M].New York:Gleeble System School,1998.
【19】马英义,宛亚坤,王景新.6082铝合金热轧工艺研究[J].轻合金加工技术,2000,28(6):11-13．
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