The effect of aging process on the microstructure and mechanical properties of a Cu-Be-Co-Ni alloy

被引：28

作者：

Tang, Yanchuan ^{[1
]}

Kang, Yonglin ^{[1
]}

Yue, Lijuan ^{[2
]}

Jiao, Xiaoliang ^{[2
]}

机构：

[1] Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China

[2] CNMC Ningxia Orient Grp Co Ltd, Shizuishan 753000, Peoples R China

来源：

MATERIALS & DESIGN | 2015年 / 85卷

基金：

中国国家自然科学基金;

关键词：

Cu-Be-Co-Ni alloy; Interrupted aging; Mechanical properties; Micro-fracture mechanism; Precipitate; Strengthening mechanism; HIGH-STRENGTH; SECONDARY PRECIPITATION; BEHAVIOR; STRESS; PARTICLES; FRACTURE; GROWTH;

D O I：

10.1016/j.matdes.2015.06.157

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The paper investigated the effect of two aging processes (i.e. normal aging and interrupted aging) on the microstructure and mechanical properties of a Cu-Be-Co-Ni alloy. The results of tensile and Kahn tear tests showed that the interrupted aging (IA) process could significantly improve the uniform elongation and plane stress fracture toughness with tiny decrease in ultimate tensile strength, when compared with the results from normal aging (NA) process. Under the scanning electron microscope, the fracture surface of samples treated by NA followed the intergranular fracture, while that of the samples treated by IA followed the transgranular fracture. The transmission electron microscope study revealed the differences between the microstructure of the alloy treated by NA and IA processes. After the NA process, the slender strip of gamma ' precipitates aggregated at grain boundaries with a length of approximately 10 to 45 nm; the disk-shaped gamma '' precipitates in the alloy treated by IA distributed homogenously throughout whole grains with a length of about 310 10 nm. The discussion of strengthening mechanisms demonstrated that the mechanism of precipitate shearing by dislocations made a contribution to the strengthening of the alloy treated by IA, while the Orowan mechanism was the dominant strengthening mechanism in the alloy treated by NA. (C) 2015 Elsevier Ltd. All rights reserved

引用

页码：332 / 341

页数：10

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