Effect of non-isothermal creep aging on the microstructure, mechanical properties and stress corrosion cracking resistance of 7075 alloy

doi:10.1016/j.jmrt.2023.10.258

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	Effect of non-isothermal creep aging on the microstructure, mechanical properties and stress corrosion cracking resistance of 7075 alloy
	Jiang, Bo; Fan, Aoyun; Cao FH(曹富华); Yi, Xiaoou; Zhu, Junhao; Li, Shichen; Liu, Rui
通讯作者	Yi, Xiaoou(xiaoouyi@ustb.edu.cn) ; Li, Shichen(740920844@qq.com)
发表期刊	JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
	2023-11-01
卷号	27 页码:4738-4749
ISSN	2238-7854
摘要	The effect of non-isothermal creep aging (NICA) on the microstructure, mechanical properties, and stress corrosion cracking (SCC) resistance of 7075 alloy was investigated. The results showed that the tensile strength of the alloy increased to 565 MPa when the alloy was heated to 210 degrees C (CH210) and reached 580 MPa when it was subsequently cooled to 120 degrees C (CC120). Simultaneously, the SCC susceptibility of rtf increased from 50.8 % to 98.4 %. As compared with traditional creep aging process [1], a large strength increment with excellent stress corrosion resistance have been obtained by NICA. The microstructure revealed that a lot of dislocations have been introduced by creep during the heating stage which could improve the precipitates volume fraction and accelerate the diffusion of solutes; while during the cooling stage, eta ' was greatly refined, and GPI and GPII were re-precipitated from the matrix due to the decreased solid solubility and increased critical radius R*; both of them are responsible for the continuous strength increase during NICA. Moreover, the width of the precipitate free zone (PFZ) was narrowed from 46.1 nm (CH210) to 28.6 nm (CC120). The microchemical analysis reveals that solutes were more homogenously distributed in grain boundary precipitates (GB-ppts), matrix precipitates, the PFZ, and the matrix with the help of creep. The narrower PFZ and homogeneous solute distribution are responsible for improving the SCC susceptibility in the CC120 alloy.
关键词	Non-isothermal creep aging SCC Microchemical analysis Precipitate
DOI	10.1016/j.jmrt.2023.10.258
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:001148243200001
关键词[WOS]	ZN-MG ALLOY ; GRAIN-BOUNDARY MICROCHEMISTRY ; HEAT-TREATMENT ; BEHAVIOR ; PRECIPITATION ; EMBRITTLEMENT ; SEGREGATION ; STRENGTH ; ZONES ; SPRINGBACK
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
资助项目	National Natural Science Foundation of China[52001033] ; National Natural Science Foundation of China[12102433] ; Innovation and Entrepreneurship Program of Jiangsu Province of China[JSSCBS20210878] ; Research and industrialization of high-performance nitrogen and oxygen sensor chips for the automotive industry[HK2021004]
项目资助者	National Natural Science Foundation of China ; Innovation and Entrepreneurship Program of Jiangsu Province of China ; Research and industrialization of high-performance nitrogen and oxygen sensor chips for the automotive industry
论文分区	一类
力学所作者排名	3
RpAuthor	Yi, Xiaoou ; Li, Shichen
引用统计
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/94211
专题	非线性力学国家重点实验室
推荐引用方式 GB/T 7714	Jiang, Bo,Fan, Aoyun,Cao FH,et al. Effect of non-isothermal creep aging on the microstructure, mechanical properties and stress corrosion cracking resistance of 7075 alloy[J]. JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T,2023,27:4738-4749.
APA	Jiang, Bo.,Fan, Aoyun.,曹富华.,Yi, Xiaoou.,Zhu, Junhao.,...&Liu, Rui.(2023).Effect of non-isothermal creep aging on the microstructure, mechanical properties and stress corrosion cracking resistance of 7075 alloy.JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T,27,4738-4749.
MLA	Jiang, Bo,et al."Effect of non-isothermal creep aging on the microstructure, mechanical properties and stress corrosion cracking resistance of 7075 alloy".JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T 27(2023):4738-4749.

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