Structural instability of plate-shaped θ' precipitates in an aged Al-Cu alloy

被引：12

作者：

Gong, Yanli ^{[1
,2
]}

Gao, Lin ^{[2
]}

Li, Kai ^{[2
]}

Du, Yong ^{[2
]}

Song, Min ^{[2
]}

机构：

[1] Hunan Ind Polytech, Dept Automobile Engn, Changsha, Peoples R China

[2] Cent South Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China

来源：

PHILOSOPHICAL MAGAZINE LETTERS | 2020年 / 100卷 / 11期

基金：

中国国家自然科学基金;

关键词：

Aluminum alloy; precipitate; interface; stacking faults; transmission electron microscopy; SHEAR-RESISTANT; ALUMINUM-ALLOYS; PHASE; TRANSFORMATION; MECHANISM; EVOLUTION; BEHAVIOR; GROWTH;

D O I：

10.1080/09500839.2020.1810861

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The present work verifies the structural instability of theta' precipitates, a primary strengthening phase in aged Al-Cu alloys, using atomic-scale imaging. A periodic structure of the precipitate has been found around the semi-coherent interface. In addition, the experimental results also show that the structure of the shear-resistant precipitate can be modified by long-time electron beam irradiation in the transmission electron microscope. During the process, stacking faults will be introduced in both the precipitates and the matrix, and a step with a height of four atomic layers will be formed on the coherent interface between precipitates and matrix.

引用

页码：524 / 532

页数：9

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