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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
【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.
【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.
【Key words】 aluminum alloy; cryomilling; spark plasma sintering; microstructure;
- 【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