Al-Zn-Mg-Cu合金铣削表面变形层的微观组织和织构

Al-Zn-Mg-Cu合金铣削表面变形层的微观组织和织构

利用透射电镜（TEM）技术以及配套的旋进电子衍射（PED）技术对铣削Al-Zn-Mg-Cu合金表面变形层的微观组织和织构进行研究。结果表明：表面变形层是由最表层的等轴纳米晶/超细晶层和亚表层的层状纳米晶/超细晶层组成,晶粒周围分布大量的粗大晶界析出相（GBPs）;最表层再结晶的纳米晶/超细晶的存在说明除了位错运动,动态再结晶也在晶粒细化过程中发挥作用;与原始粗晶相比,加工表面变形层内GBPs和晶内析出相（GIPs）尺寸和密度明显的不同是由于热机械作用诱发析出相重新分布;表面变形层的织构类型为由近铜型织构{112}〈111〉、旋转立方织构{001}〈110〉和F型织构{111}〈112〉组成的混...

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Bibliographic Details
Published in:航空材料学报 Vol. 37; no. 6; pp. 95 - 101
Main Author: 陈艳霞;杨延清
Format: Journal Article
Language:Chinese
Published: 西北工业大学材料学院,西安,710072 2017
Subjects:
Al-Zn-Mg-Cu合金
旋进电子衍射
析出相
织构
析出相
precipitate
织构
texture
Al-Zn-Mg-Cu合金
precession electron diffraction(PED)
旋进电子衍射
Al-Zn-Mg-Cu alloy
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Summary:利用透射电镜（TEM）技术以及配套的旋进电子衍射（PED）技术对铣削Al-Zn-Mg-Cu合金表面变形层的微观组织和织构进行研究。结果表明：表面变形层是由最表层的等轴纳米晶/超细晶层和亚表层的层状纳米晶/超细晶层组成,晶粒周围分布大量的粗大晶界析出相（GBPs）;最表层再结晶的纳米晶/超细晶的存在说明除了位错运动,动态再结晶也在晶粒细化过程中发挥作用;与原始粗晶相比,加工表面变形层内GBPs和晶内析出相（GIPs）尺寸和密度明显的不同是由于热机械作用诱发析出相重新分布;表面变形层的织构类型为由近铜型织构{112}〈111〉、旋转立方织构{001}〈110〉和F型织构{111}〈112〉组成的混合型织构,铣削加工过程引入的表面剧烈剪切变形是上述织构形成的主要原因。
Bibliography:11-3159/V
CHEN Yanxia , YANG Yanqing（School of Materials Science and Engineering, Northwestern Polytechnical University, Xi ’ an 710072,China）
The microstructural and crystallographic features of the surface deformation layer in Al-Zn-Mg-Cu alloy induced by milling were investigated by means of transmission electron microscopy （TEM） and precession electron diffraction （PED） assisted nanoscale o-rientation mapping. The result shows that the surface deformation layer is composed by the top surface of equiaxed nanograins/ultrafine grains and the subsurface of lamellar nanograins/ultrafine grains surrounded by coarse grain boundary precipitates （GBPs）. The recrys-tallized nanograins/ultrafine grains in the deformation layer show direct evidence that dynamic recrystallization plays an important role in grain refining process. The GBPs and grain interior precipitates （GIPs） show a great difference in size and density with the matrix due to the thermally and mechanically induced precipitate redistribution. The crystal
ISSN:1005-5053
DOI:10.11868/j.issn.1005-5053.2017.000109