Near-microscopic grain boundary facilitates fatigue crack propagation in a polycrystalline Al-Zn-Mg-Cu alloy

被引：3

作者：

Wen, Kai ^{[1
,2
,3
]}

Li, Xiwu ^{[1
,2
,3
]}

Xiong, Baiqing ^{[1
,3
]}

Lin, Haitao ^{[4
]}

Wen, Qinghong ^{[4
]}

Li, Yanan ^{[1
,2
,3
]}

Yan, Hongwei ^{[1
,2
,3
]}

Yan, Lizhen ^{[1
,2
,3
]}

Zhang, Yongan ^{[1
,2
,3
]}

Li, Zhihui ^{[1
,3
]}

Liu, Hongwei ^{[1
,2
,3
]}

机构：

[1] China GRINM Grp Co LTD, State Key Lab Nonferrous Met & Proc, Beijing 100088, Peoples R China

[2] GRIMAT Engn Inst Co LTD, Beijing 101407, Peoples R China

[3] Gen Res Inst Nonferrous Met, Beijing 100088, Peoples R China

[4] Southwest Aluminum Grp Co Ltd, Chongqing 401326, Peoples R China

来源：

PROGRESS IN NATURAL SCIENCE-MATERIALS INTERNATIONAL | 2023年 / 33卷 / 01期

关键词：

Fatigue crack propagation; Grain size; Grain boundary; Cyclic plastic zone; Al-Zn-Mg-Cu alloy; ALUMINUM; GROWTH; SIZE; PRECIPITATION;

D O I：

10.1016/j.pnsc.2022.12.006

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In present study, grain characteristics with sizes within 10 -30 mu m were fabricated from a same Al -Zn -Mg -Cu alloy, FCP behaviors of the alloys with small grain (SG alloy), medium grain (MG alloy) and large grain (LG alloy) were investigated and related fatigue fracture morphology was analyzed. With the enhancement of stress intensity factor range (.K), the alloy with larger grains possessed faster FCP rate, which were successively arranged as SG alloy > MG alloy > LG alloy at initial stage while turned to LG alloy > MG alloy > SG alloy at final stage for the stable expanding region. Except for conventional characteristics of striations, tearing ridges, secondary cracks, second phases, voids and dimples, more prominent grain boundary features appeared on fracture surface, especially for MG and LG alloy. The calculation of cyclic plastic zone (CPZ) sizes proved that grain boundary participated and promoted FCP behavior when CPZ covered grain and grain boundary together.

引用

页码：120 / 125

页数：6

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