A new type of anti-phase boundaries in the T(Al20Cu2Mn3) phase and the pre-deformation effect on T phase precipitation

被引：21
作者：
Chen, Y. Q. [1 ]
Tang, Z. H. [1 ]
Pan, S. P. [2 ]
Liu, W. H. [1 ]
Song, Y. F. [1 ]
Liu, Y. [1 ]
Zhu, B. W. [1 ]
Zhou, W. [1 ]
Shen, F. H. [3 ]
机构：
[1] Hunan Univ Sci & Technol, Hunan Prov Key Lab New Energy Storage & Convers A, Xiangtan 411201, Peoples R China
[2] Cent South Univ, Sch Mat Sci & Engn, Changsha 410083, Peoples R China
[3] Dongguan Univ Technol, Sch Mech Engn, Dongguan 523808, Guangdong, Peoples R China
来源：
INTERMETALLICS | 2020年 / 127卷
基金：
中国国家自然科学基金;
关键词：
Al alloys; T phase; Interface; Anti-phase boundaries; Pre-deformation; High-resolution transmission electron microscopy; MG-MN ALLOY; ORIENTATION RELATIONSHIPS; ALUMINUM-ALLOY; GRAIN-BOUNDARIES; CU; EVOLUTION; MICROSTRUCTURE; AL20CU2MN3; BEHAVIOR; PARTICLE;
D O I：
10.1016/j.intermet.2020.106977
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The anti-phase boundaries (APBs) in the T (Al20Cu2Mn3) phase and the interfaces of the T phase with an Al matrix were observed. The effects of pre-deformation on the precipitation behavior of T phase and hardening behavior of alloy were investigated by hardness measurement, mechanical tensile test, transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM). Results show that two kinds of APBs exist in the T phase, i.e. {101}(T) and {301}(T)-type APBs. The first is commonly observed, while the latter is newly found and only coexists with the first to form a zig-zag shaped APB. Whatever its orientation relationships (ORs) with Al matrix and cross-section (CS) shape, the T phase always retains its interfaces constituted by {200}(T), {101}(T )and {301}(T) planes. Pre-deformation increases the APBs in T phase and intensifies the irregularity of the CS shape of a T phase. Besides, it also promotes the nucleation and refines the size of the T phase during precipitation which enhances the mechanical properties of the alloy.
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页数：12
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