In-situ TEM study on the effect of stacking faults on micro-plasticity and proportional limit in SiC/Al composites

被引：28

作者：

Gong, Deng ^{[1
]}

Zhu, Ming ^{[1
]}

You, Zesheng ^{[2
]}

Han, Huimin ^{[1
]}

Chao, Zhenlong ^{[1
]}

Jiang, Longtao ^{[1
,3
]}

机构：

[1] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin, Peoples R China

[2] Nanjing Univ Sci & Technol, Herbert Gleiter Inst Nanosci, 200 Xiaolingwei St, Nanjing, Peoples R China

[3] Harbin Inst Technol, State Key Lab Adv Welding & Joining, Harbin, Peoples R China

来源：

COMPOSITES PART B-ENGINEERING | 2022年 / 244卷

基金：

中国国家自然科学基金;

关键词：

Al matrix composites (AMCs); Micro-plasticity; Stacking faults; Proportional limit; In-situ TEM; MICROSTRAIN BEHAVIOR; ALUMINUM; STABILITY; SLIP; AL;

D O I：

10.1016/j.compositesb.2022.110180

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Enhancing the proportional limit of Al matrix composites (AMCs) is critical to the reliability of precision electronic instruments. In this paper, SiC/Al composites containing stacking faults (SFs) were successfully fabricated using pressure infiltration method. The proportional limit (sigma p5 and sigma p100) of SiC/Al composites with SFs reached 65 MPa and 124 MPa, respectively, which was 8%-22% higher than theoretical prediction of the Brown-Lukens empirical formula. In-situ TEM tensile test was conducted to reveal the strengthening behavior of SFs during micro-plasticity. The results showed that the extra strengthening effect in SiC/Al composites with SFs includes elastic interactions of SF extension, sessile stair-rod partial dislocations and interactions of SF networks and dislocation arrays. This work reveals the influence of SFs on the micro-plasticity and strengthening behavior of AMCs and proposes a new strategy to endow AMCs with higher proportional limit for precision instrumentation applications.

引用

页数：15