喷射成形2124铝合金的热轧致密化与力学性能
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摘要
采用喷射成形方法制备2124铝合金坯,探索其热轧致密化工艺,并研究热轧变形量和变形温度对材料显微组织和力学性能的影响。结果表明,材料最佳的热轧温度为450℃,在该温度下热轧可以保持喷射成形工艺制备的2124铝合金获得细小晶粒组织的优势,且轧件可以获得较佳的力学性能。热轧过程中,当总变形量小于30%时,材料的致密化速度较快;当总变形量达到40%时,材料基本完成致密化。当热轧温度为450℃,变形量为80%时,喷射成形+轧制后材料的拉伸性能高于铸造+轧制的材料。对喷射成形+热轧材料进行T6处理,材料强度可较大提高,抗拉强度达到502.2MPa,伸长率为12.23%。
2124 aluminum alloy was prepared by spray forming technology.Its densification mechanism during hot rolling was investigated.The effects of deformation rates and deforming temperature on microstructures and mechanical properties were also studied.The results show that the optimum deforming temperature is 450 ℃,and at this temperature the deposit maintains a fine grain microstructure and a relatively high strength after hot rolling.The densification rate is high when the total deformation extent is less than 30%,however,when the total deformation extent is up to 40% the fully dense alloy can be fabricated.At the temperature of 450℃ and deformation extent of 80%,the tensile strength of the spray formed and rolled alloy is superior to those of as-cast and rolled ones.After T6 heat treatment,the tensile strength of spray formed and rolled strip is enhanced.Its tensile strength is 502.2 MPa and elongation is 12.23%.
2124 aluminum alloy was prepared by spray forming technology.Its densification mechanism during hot rolling was investigated.The effects of deformation rates and deforming temperature on microstructures and mechanical properties were also studied.The results show that the optimum deforming temperature is 450 ℃,and at this temperature the deposit maintains a fine grain microstructure and a relatively high strength after hot rolling.The densification rate is high when the total deformation extent is less than 30%,however,when the total deformation extent is up to 40% the fully dense alloy can be fabricated.At the temperature of 450℃ and deformation extent of 80%,the tensile strength of the spray formed and rolled alloy is superior to those of as-cast and rolled ones.After T6 heat treatment,the tensile strength of spray formed and rolled strip is enhanced.Its tensile strength is 502.2 MPa and elongation is 12.23%.
引文
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[3]张济山,熊柏青,崔华.喷射成形快速凝固技术--原理与应用[M].北京:科学出版社,2008:333.ZHANG Ji-shan,XIONG Bai-qing,CUI Hua.Spray forming rapid solidification technology:principles and applications[M].Beijing:Science Press,2008:333.
[4]陈志钢,陈振华,陈鼎.喷射沉积及其制品的后续致密化研究[J].材料导报,2008,22(5):92-95.CHEN Zhi-gang,CHEN Zhen-hua,CHEN Ding.Research of spray deposition and subsequent densification for its production[J].Materials Review,2008,22(5):92-95.
[5]ZHAN Mei-yan,CHEN Zhen-hua,YAN Hong-ge,et al.Deformation behaviors of porous4032Al alloy preform prepared by spray deposition during hot rolling[J].Journal of Materials Processing Technology,2007,182:174-180.
[6]张永安,刘红伟,朱宝宏,等.新型60Si40Al合金封装材料的喷射成形制备[J].中国有色金属学报,2004,14(1):23-27.ZHANG Yong-an,LIU Hong-wei,ZHU Bao-hong,et al.Novel60Si40Al alloy packaging material by prepared spray forming process[J].The Chinese Journal of Nonferrous Metals,2004,14(1):23-27.
[7]GUO Shu,NING Zhi-liang,CAO Fu-yang,et al.Microstructural evolution of spray-formed Al-11.5Zn-2.0Mg-1.6Cu alloy during hot-extrusion and heat treatment[J].Transactions of Nonferrous Metals Society of China,2009,19:s343-s348.
[8]SRIVASTAVA A K,SRIVASTAVA V C,GLOTER A,et al.Microstructural features induced by spray processing and hot extrusion of an Al-18%Si-5%Fe-1.5%Cu alloy[J].Acta Materialia,2006,54:1741-1748.
[9]赵世庆,王华春,郭金龙,等.铝合金热轧及热连轧技术[M].北京:冶金工业出版社,2010:101-116.ZHAO Shi-qing,WANG Hua-chun,GUO Jin-long,et al.Aluminum alloy hot rolling and continuous rolling technology[M].Beijing:Metallurgical Industry Press,2010:101-116.
[10]KOVAL'CHENKO M S.Deformation of the type of stressed by a porous solid in hot rolling[J].Powder Metallurgy and Metal Ceramics,1978,17:351-362.
[11]詹美燕,陈振华.喷射沉积多孔材料的轧制变形理论[J].材料研究学报,2004,18(6):661-667.ZHAN Mei-yan,CHEN Zhen-hua.Plasticity theory during rolling of spray deposited porous materials[J].Chinese Journal of Materials Research,2004,18(6):661-667.
[12]陈飞凤,严红革,陈振华,等.外框限制轧制工艺在喷射沉积板坯加工中的应用[J].机械工程材料,2007,31(2):19-22.CHEN Fei-feng,YAN Hong-ge,CHEN Zhen-hua,et al.Application of frame-pack rolling technology to process of spray deposition sheets[J].Materials for Mechanical Engineering,2007,31(2):19-22.
[13]XIAO Yu-de,LI Wen-xian,LI Song-rui,et al.Microstructures and mechanical properties of spun pipe blanks of Rs Alfex alloy[J].Transactions of Nonferrous Metals Society of China,1998,8(1):102-106.
[14]龚艳丽,陈振华,夏伟军,等.喷射沉积8009/SiCp铝合金的陶粒轧制成形性能研究[J].材料导报,2007,21(9):142-145.GONG Yan-li,CHEN Zhen-hua,XIA Wei-jun,et al.Study on ceramisite rolling formation ability of spray deposited8009/SiCP aluminum alloy[J].Materials Review,2007,21(9):142-145.