Effects of thermo-mechanical processing on microstructure and properties of Cu-0.9Hf alloy

Jia, Yanlin1; Li, Linhan1; Liao, Xianfeng1; Xin, Zhao1; Li, Ying1; Zhang, Yufang1,2; Li, Zhou1; Pang, Yong1; Yi, Jiang3

2024-10-25

10.1016/j.jallcom.2024.175574

JOURNAL OF ALLOYS AND COMPOUNDS   影响因子和分区

0925-8388

1873-4669

Cu-Hf alloys, which exhibit electrical conductivity up to 80 %IACS, are promising high-strength and highconductivity copper alloys. However, the performance of Cu-Hf alloys under different thermos-mechanical processes (TMP) remains unclear. This work systematically investigates the microstructural evolution and property changes in Cu-0.9Hf alloy subjected to four prevalent TMP routes, including solid solution-aging, solid solution-cold rolling-aging, multi-step TMP, and TMP combined with pre-aging. The pre-aged Cu-0.9Hf alloy demonstrates the highest strength (666 MPa), while the multi-stage TMP Cu-0.9Hf alloy achieves optimal comprehensive properties: 628 MPa and 77.7 %IACS. The Corresponding strengthening-mechanism analysis indicates that dislocation-strengthening is the primary contributor. Additionally, the Cu-0.9Hf alloy exhibits good high-temperature softening resistance in this work. Microstructural analysis reveals that despite precipitate coarsening and morphological evolution during aging, the Cu matrix maintains a high dislocation density without apparent recrystallization, even at the over-aging stage. The pinning effects of Hf-containing second phases on dislocations during aging are crucial for the alloy's excellent softening resistance.

Cu-Hf alloys High-strength and high-conductivity copper alloys Thermos-mechanical processing Softening resistance mechanism

SCI ; EI

英语

通讯

National Natural Science Foundation of China[U2202255]

Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering

Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering

WOS:001273593500001

ELSEVIER SCIENCE SA

20242916711458

Coarsening ; Cold rolling ; Copper alloys ; Grain refinement ; Hafnium alloys ; High strength alloys ; Precipitation (chemical) ; Solid solutions

Metallurgy:531.1 ; Rolling Mill Practice:535.1.2 ; Copper Alloys:544.2 ; Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals:549.3 ; Chemical Operations:802.3 ; Solid State Physics:933 ; Materials Science:951

MATERIALS SCIENCE

Web of Science

1.Cent South Univ, Sch Mat Sci & Engn, Changsha 410083, Peoples R China
2.Cent South Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China
3.Southern Univ Sci & Technol, Dept Mech & Energy Engn, Shenzhen 518055, Peoples R China

Jia, Yanlin,Li, Linhan,Liao, Xianfeng,et al. Effects of thermo-mechanical processing on microstructure and properties of Cu-0.9Hf alloy[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2024,1003.

Jia, Yanlin.,Li, Linhan.,Liao, Xianfeng.,Xin, Zhao.,Li, Ying.,...&Yi, Jiang.(2024).Effects of thermo-mechanical processing on microstructure and properties of Cu-0.9Hf alloy.JOURNAL OF ALLOYS AND COMPOUNDS,1003.

Jia, Yanlin,et al."Effects of thermo-mechanical processing on microstructure and properties of Cu-0.9Hf alloy".JOURNAL OF ALLOYS AND COMPOUNDS 1003(2024).