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材料工程  2017, Vol. 45 Issue (11): 78-83    DOI: 10.11868/j.issn.1001-4381.2015.001407
  研究论文 本期目录 | 过刊浏览 | 高级检索 |
铝镁异种金属复合挤压成形及界面微观组织
乔及森1,2, 向阳芷1,2, 聂书才1, 张涵1,2
1. 兰州理工大学 材料科学与工程学院, 兰州 730050;
2. 兰州理工大学 省部 共建有色金属先进加工与再利用国家重点实验室, 兰州 730050
Compound Extrusion Forming and Interface Microstructure of Al/Mg Dissimilar Metal
QIAO Ji-sen1,2, XIANG Yang-zhi1,2, NIE Shu-cai1, ZHANG Han1,2
1. School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China;
2. State Key Laboratory of Advanced Processing and Recycling Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China
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摘要 基于Deform 2D有限元模拟优化挤压工艺参数,在挤压速率2mm/s,挤压温度470℃下对铝镁双金属进行复合挤压实验,并采用扫描电镜(SEM)、显微硬度测试以及电子背散射衍射(EBSD)对复合挤压件界面结合层进行微观组织观察与分析。结果表明:在铝镁合金接触区反应生成了界面层,层内新的物相为靠近AZ31镁基体一侧的Al12Mg17以及靠近铝基体一侧的Al3Mg2。Al3Mg2相显微硬度值最高,平均值约为210HV,Al12Mg17相平均硬度约为170HV,因而界面区硬度高于两侧基体母材,形成典型的脆硬结合层,电子背散射衍射(EBSD)结果显示,Al12Mg17相的平均晶粒尺寸为30μm,Al3Mg2相的平均晶粒尺寸约为20μm,复合界面结合层区域晶粒取向各异,晶粒尺寸大小也不均匀,而复合外层纯铝基体取向区域均匀,新生成相在晶界上有部分再结晶发生。
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乔及森
向阳芷
聂书才
张涵
关键词 铝镁合金复合挤压脆性相显微硬度电子背散射衍射    
Abstract:The extrusion process parameters were optimized based on Deform 2D finite element simulation, aluminum magnesium bimetal composite extrusion experiment was conducted under the extrusion rate of 2mm/s and extrusion temperature of 470℃. The microstructure of interface bonding layer was observed and analyzed by using scanning electron microscopy(SEM), microhardness test and electron backscattering diffraction(EBSD).The results show that interface layer generates in the contact region of aluminum and magnesium alloys, new phases in the layer are Al12Mg17 which is close to the AZ31 magnesium substrate and Al3Mg2 which is close to the aluminum substrate. The average microhardness value of Al3Mg2 phase is the highest, the average value is about 210HV, and that of Al12Mg17 is 170HV, the interface area forms a typical brittle layer as the hardness is higher than the parent metal on both substrate sides, the EBSD test shows that the average grain size of Al12Mg17 phase is 30μm,the average grain size of Al3Mg2 phase is about 20μm, different grain orientation can be observed in composite interface bonding layer regional and the grain size is not uniform, the outer pure aluminum matrix composite orientation area is uniform, some recrystallization of new generation phase occurs on the grain boundary.
Key wordsAl/Mg alloy    compound extrusion    brittle phase    microhardness    electron backscattering diffraction
收稿日期: 2015-11-18      出版日期: 2017-11-18
中图分类号:  TG379  
通讯作者: 乔及森(1973-),男,博士,教授,研究方向:轻金属塑性加工,联系地址:甘肃省兰州市七里河区兰工坪路287号兰州理工大学材料科学与工程学院(730050),E-mail:qiaojisen@lut.cn     E-mail: qiaojisen@lut.cn
引用本文:   
乔及森, 向阳芷, 聂书才, 张涵. 铝镁异种金属复合挤压成形及界面微观组织[J]. 材料工程, 2017, 45(11): 78-83.
QIAO Ji-sen, XIANG Yang-zhi, NIE Shu-cai, ZHANG Han. Compound Extrusion Forming and Interface Microstructure of Al/Mg Dissimilar Metal. Journal of Materials Engineering, 2017, 45(11): 78-83.
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http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2015.001407      或      http://jme.biam.ac.cn/CN/Y2017/V45/I11/78
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