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放电等离子烧结制备Al-Zn-Mg-Cu纳米晶合金的组织

Microstructure of a bulk nanocrystalline Al-Zn-Mg-Cu alloy prepared by cryomilling and spark plasma sintering

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【Author】 CHEN Hanbin1), CHENG Junsheng1), YANG Bin1,2), ZHANG Jishan1), FAN Jianzhong2), TIAN Xiaofeng2)1) State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China 2) International Center for Materials Physics, Chinese Academy of Sciences, Shenyang 110016, China 3) Beijing General Research Institute for Nonferrous Metals, Beijing 100088, China

【机构】北京科技大学新金属材料国家重点实验室；中国科学院国际材料物理中心沈阳110016；北京有色金属研究总院；北京100083；北京100088；

【摘要】利用低温液氮球磨和放电等离子烧结工艺制备了块体纳米晶Al-Zn-Mg-Cu合金.采用X射线衍射(XRD)技术分析了材料的晶粒尺寸和微观应变,利用透射电镜(TEM)研究了合金微观组织的演变.结果表明采用放电等离子烧结法制备的7000系纳米铝合金具有两种不同的纳米晶结构,以晶粒尺寸50~100nm的等轴晶为主,少量200~400nm的大晶粒为辅;烧结过程中发生再结晶及第二相析出,析出的第二相以η(MgZn2)为主,θ(Al2Cu)以及S(Al2CuMg)为辅.更多还原

【Abstract】 A bulk nanocrystalline Al-Zn-Mg-Cu alloy was produced by cryomilling and spark plasma sintering. The grain size, the microstrain, phase transformation and microstructure of this alloy were investigated by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results show that the bulk nanocrystalline 7000 aluminum alloy prepared by spark plasma sintering has two types of distinctive nanostructures: primarily equiaxed grains with diameters of 50-100 nm, and a few of larger grains with diameters of 200-400 nm. The precipitate of second phases, mainly including η(MgZn2) and a few θ(Al2Cu) and S(Al2CuMg), and recrystallization of the bulk nanocrystalline 7000 aluminum alloy were found during the consolidation process by SPS.更多还原

【关键词】铝合金；低温球磨；放电等离子烧结；微观组织；
【Key words】 aluminum alloy； cryomilling； spark plasma sintering； microstructure；

【基金】国家“863”纳米专项课题(No.2002AA302502)

【文献出处】北京科技大学学报 ,Journal of University of Science and Technology Beijing , 编辑部邮箱 ,2007年03期

【分类号】TF124.5;TB383.1
【被引频次】6
【下载频次】396

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