固溶处理对新型Al-8.8Zn-2.3Mg-1.8Cu-0.13Zr合金挤压材组织及性能的影响
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摘要
采用金相、扫描电镜、能谱分析、拉伸性能等分析检测方法研究了一种新型Al-8.8Zn-2.3Mg-1.8Cu-0.13Zr合金型材热处理过程的组织与性能演变。结果表明,挤压态试验合金中主要有α(Al)、(AlCuZn)_2Mg、MgZn_2相,(AlCuZn)_2Mg发生相转变的起始温度为476.9℃,且随固溶温度的提高,第二相回溶充分,再结晶比例逐渐增加;470℃~480℃固溶并时效后合金的强度较高,但480℃时发生轻度过烧,塑性下降;合金较适宜的固溶温度为470℃~475℃。
The paper studied evolution of microstructure and properties of Al-8.8Zn-2.3Mg-1.8Cu-0.13Zr alloy for extrusion in heat treatment process using OM,SEM,EDS,and tensile test. The results showed that the phases,including α( Al),( AlCuZn)_2Mg and MgZn_2,were in as-extruded tested alloy; Phase transition of(AlCuZn)_2Mg started at initial temperature of 476. 9℃; as solution temperature increased,second phase sufficiently dissolved and the proportion of recrystallization gradually increased; the alloy had higher strength after solution treating and aging at 470℃ ~ 480℃ with lower plasticity due to slight overburning at 480℃; proper solution temperature of the alloy was 470℃ ~ 475℃.
The paper studied evolution of microstructure and properties of Al-8.8Zn-2.3Mg-1.8Cu-0.13Zr alloy for extrusion in heat treatment process using OM,SEM,EDS,and tensile test. The results showed that the phases,including α( Al),( AlCuZn)_2Mg and MgZn_2,were in as-extruded tested alloy; Phase transition of(AlCuZn)_2Mg started at initial temperature of 476. 9℃; as solution temperature increased,second phase sufficiently dissolved and the proportion of recrystallization gradually increased; the alloy had higher strength after solution treating and aging at 470℃ ~ 480℃ with lower plasticity due to slight overburning at 480℃; proper solution temperature of the alloy was 470℃ ~ 475℃.
引文
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[2]Chinh N Q,Lendvai J,Ping D H,et al.The effect of Cu on mechanical and precipitation properties of Al-Zn-Mg alloys[J].Journal of Alloys&Compounds,2004,378(1):52-60.
[3]熊柏青,李锡武,张永安,等.高强韧低淬火敏感性7XXX系铝合金的发展[J].中国材料进展,2014,33(2):114-119.
[4]滕海涛,熊柏青,张永安,刘宏伟,贺昕.高Zn含量Al-Zn-Mg-Cu系铝合金的凝固态显微组织[J].2015,25(4):852-865.
[5]Jun-tao LIU,Yong-an ZHANG,Xi-wu LI,Zhi-hui LI,Baiqing XIONG,Ji-shan ZHANG.Thermodynamic calculation of high zinc-containing Al-Zn-Mg-Cu alloy[J].Transactions of Nonferrous Metals Society of China,2014,24(5):1481-1487.
[6]韩逸,李炼,牟申周,等.Al-9.1Zn-1.9Mg-1.6Cu合金均匀化工艺研究[J].特种铸造及有色合金,2010,30(10):891-893.
[7]郭富安,赵业青,李俊鹏,鲁法云.变形条件对7056铝合金热变形显微组织演化的影响[J].材料导报,2014,S2:463-465.
[8]蒋建辉,郑子樵,唐娟,李世晨.单级时效7056铝合金的显微组织与性能[J].机械工程材料,?2013,37(4):69-74.
[9]刘诗安,孟显娜,金能萍,张辉.7056铝合金高温热压缩流变应力行为[J].热加工工艺,2009,38(24):27-29.
[10]Chen Z Y,Mo Y K,Nie Z R.Effect of Zn content on the microstructure and properties of super-high strength Al-Zn-Mg-Cu alloys[J].2013,44(8):3910-3920.
[11]Marlaud T,Deschamps A,Bley F.Influence of alloy composition and heat treatment on precipitate composition in Al-Zn-Mg-Cu alloys[J].Acta Materialia,2010,58(1):248-260.
[12]MONDAL C,MUKHOPADHYAY A K.On the nature of T(Al2Mg3Zn3)and S(Al2Cu Mg)phases present in as-cast and annealed 7055 aluminum alloy[J].Materials Science and Engineering A,2005,391(1-2):367-376.