Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第28卷    第7期    总第232期    2018年7月

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文章编号:1004-0609(2018)-07-1291-08
挤压温度对6005A铝合金焊合区域显微组织和力学性能的影响
薛江平,黄东男,左壮壮,玄东坡,吴 南,孙 磊

(内蒙古工业大学 材料科学与工程学院,呼和浩特 010051)

摘 要: 针对分流模挤压焊合部位的金属在模具中难以取出进行分析,设计了分析焊缝组织性能的简易模具;采用电子背散射衍射分析(EBSD)和拉伸试验,研究挤压温度对6005A铝合金挤压焊合组织性能的影响。结果表明:挤压温度为500~580 ℃ 时,6005A铝合金焊合组织的平均晶粒尺寸呈先减小后增大的趋势;当在挤压温度为540 ℃时,焊合组织平均晶粒尺寸最小,约为52 μm,且此时的晶粒尺寸均匀程度最佳。焊合组织中小角度晶界所占比例较多,且随着挤压温度的提高,小角度晶界的相对频率都保持在65%左右。焊合部位的屈服强度和抗拉强度随着挤压温度的升高呈先上升后下降的趋势;当挤压温度为540 ℃时,焊合组织的力学性能最好,屈服强度为 68.56 MPa,抗拉强度为119.87 MPa。

 

关键字: 6005A铝合金;分流模挤压;挤压温度;焊合区域;显微组织;力学性能

Influence of extrusion temperature on microstructure and mechanical properties of welding zone of 6005A aluminum alloy
XUE Jiang-ping, HUANG Dong-nan, ZUO Zhuang-zhuang, XUAN Dong-po, WU Nan, SUN Lei

School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China

Abstract:A new die was designed to solve the problem that the alloy was difficult to be taken out when it was welded by porthole die extrusion. The effect of the extrusion temperature on microstructure and mechanical properties of 6005A aluminum alloy was studied by electron backscattered diffraction (EBSD), combined with the mechanical tensile properties test. The results show that the average grain size of the welding zone will be reduced at first and then improved when the extrusion temperature is in the range of 500-580 ℃, the average grain size is the smallest of about 52 μm and the uniformity is the best at 540 ℃. The percentage of the low angle boundaries of welding zone is the highest and the relative frequency of low angle boundaries keeps at 65% with the rise of extrusion temperature. The tensile strength and yield strength of the welding zone will be improved at first and then reduced with the increase of extrusion temperature. And the mechanical property of 6005A aluminum alloy is the best at 540 ℃, the yield strength and tensile strength are 68.56 MPa and 119.87 MPa, respectively.

 

Key words: 6005A aluminum alloy; porthole die extrusion; extrusion temperature; welding zone; microstructure; mechanical property

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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