微量Cu元素对Al-Zn-Mg-Cu合金组织性能的影响
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摘要
采用光学显微镜、扫描电镜、X射线衍射仪和拉伸试验机,研究了微量Cu元素对Al-Zn-Mg-Cu合金显微组织与力学性能的影响.结果表明:Al-Zn-Mg-Cu合金铸态组织由α-Al枝晶和晶间非平衡共晶相组成,经均匀化处理和挤压后,共晶相弥散分布在铝基体上.随着Cu含量的增加,Al-Zn-Mg-Cu合金挤压材的抗拉强度逐渐升高,伸长率先增后减.当Cu质量分数为0.4%时,伸长率达到最大值.当Cu含量为0.6%时,合金挤压板材的抗拉强度为439.4MPa,伸长率为15.9%,与未添加Cu元素的Al-Zn-Mg合金挤压材相比,其抗拉强度和伸长率分别提高了13.5%和9.7%.
The effect of trace Cu on microstructure and mechanical properties of Al-Zn-Mg-Cu alloy was studied by optical microscope,scanning electron microscope,X ray diffractometer and tensile tester.The results show that the microstructure of as-cast Al-Zn-Mg-Cu alloy consists of α-Al dendrite and intergranular eutectic phases.After homogenized treatment and extrusion,the eutectic phases are distributed on the aluminum matrix.With the increase of Cu content,the tensile strength of as-extruded Al-Zn-Mg-Cu alloy is increased gradually,and the elongation is first increased and then decreased.When the mass fraction of Cu is 0.4%,the elongation reaches the maximum.When the mass fraction of Cu is0.6%,the tensile strength of Al-Zn-Mg-Cu alloy is 439.4 MPa and the elongation is 15.9%,in which the tensile strength and elongation are increased by 13.5% and 9.7% compared with that of the as-extruded Al-Zn-Mg alloy without Cu element.
The effect of trace Cu on microstructure and mechanical properties of Al-Zn-Mg-Cu alloy was studied by optical microscope,scanning electron microscope,X ray diffractometer and tensile tester.The results show that the microstructure of as-cast Al-Zn-Mg-Cu alloy consists of α-Al dendrite and intergranular eutectic phases.After homogenized treatment and extrusion,the eutectic phases are distributed on the aluminum matrix.With the increase of Cu content,the tensile strength of as-extruded Al-Zn-Mg-Cu alloy is increased gradually,and the elongation is first increased and then decreased.When the mass fraction of Cu is 0.4%,the elongation reaches the maximum.When the mass fraction of Cu is0.6%,the tensile strength of Al-Zn-Mg-Cu alloy is 439.4 MPa and the elongation is 15.9%,in which the tensile strength and elongation are increased by 13.5% and 9.7% compared with that of the as-extruded Al-Zn-Mg alloy without Cu element.
引文
[1]吴海旭,杨丽,王周兵,等.我国轨道交通车辆用铝型材发展现状[J].轻合金加工技术,2014,42(1):18-20.
[2]李平,孙振宇,王祝堂.铝合金轨道车辆结构及合金性能[J].轻合金加工技术,2012,40(7):1-12.
[3]冯林威,王春海,齐金星.轨道交通用大型特种铝型材生产工艺研究[J].世界有色金属,2016(5s):25-27.
[4]张钰.浅谈Al-Zn-Mg系合金[J].铝加工,2014(2):49-53.
[5]甘卫平,范洪涛,许可勤.Al-Zn-Mg-Cu系高强铝合金研究进展[J].铝加工,2003(3):6-11.
[6]滕海涛,熊柏青,张永安,等.高Zn含量Al-Zn-Mg-Cu系铝合金的凝固态显微组织[J].中国有色金属学报,2015,25(4):852-865.
[7]舒文祥,侯陇刚,刘君城,等.先进高强韧Al-Zn-Mg-Cu合金凝固和均匀化组织及相构成[J].北京科技大学学报,2014,36(11):1534-1539.
[8]袁新雄,尹登峰,余鑫祥,等.Al-Zn-Mg-Cu-Zr-0.12Ce合金铸锭的均匀化退火及组织演变[J].中国有色金属学报,2017,27(3):459-467.
[9]夏朝峰,王良龙,陈思悦,等.Al-Zn-Mg-Cu合金时效析出相的研究[J].材料热处理学报,2011,34(S):79-82.
[10]王少华,孟令刚,房灿峰,等.新型Al-Zn-Mg-Cu合金型材双级时效组织性能研究[J].材料研究与应用,2011,5(3):190-193.
[11]喻征,赵晓东,李飞,等.铸态Al-Zn-Mg-Cu高强铝合金热拉伸力学性能及断裂行为[J].太原科技大学学报,2015,36(4):294-299.
[2]李平,孙振宇,王祝堂.铝合金轨道车辆结构及合金性能[J].轻合金加工技术,2012,40(7):1-12.
[3]冯林威,王春海,齐金星.轨道交通用大型特种铝型材生产工艺研究[J].世界有色金属,2016(5s):25-27.
[4]张钰.浅谈Al-Zn-Mg系合金[J].铝加工,2014(2):49-53.
[5]甘卫平,范洪涛,许可勤.Al-Zn-Mg-Cu系高强铝合金研究进展[J].铝加工,2003(3):6-11.
[6]滕海涛,熊柏青,张永安,等.高Zn含量Al-Zn-Mg-Cu系铝合金的凝固态显微组织[J].中国有色金属学报,2015,25(4):852-865.
[7]舒文祥,侯陇刚,刘君城,等.先进高强韧Al-Zn-Mg-Cu合金凝固和均匀化组织及相构成[J].北京科技大学学报,2014,36(11):1534-1539.
[8]袁新雄,尹登峰,余鑫祥,等.Al-Zn-Mg-Cu-Zr-0.12Ce合金铸锭的均匀化退火及组织演变[J].中国有色金属学报,2017,27(3):459-467.
[9]夏朝峰,王良龙,陈思悦,等.Al-Zn-Mg-Cu合金时效析出相的研究[J].材料热处理学报,2011,34(S):79-82.
[10]王少华,孟令刚,房灿峰,等.新型Al-Zn-Mg-Cu合金型材双级时效组织性能研究[J].材料研究与应用,2011,5(3):190-193.
[11]喻征,赵晓东,李飞,等.铸态Al-Zn-Mg-Cu高强铝合金热拉伸力学性能及断裂行为[J].太原科技大学学报,2015,36(4):294-299.