La drives the remarkable strength enhancement of the Cu-Cr-Zr alloy through traditional thermo-mechanical treatment

被引:5
作者
Xiao, Yu [1 ,2 ,3 ]
Wang, Song-Wei [3 ]
Song, Hong-Wu [3 ]
Chen, Shuai-Feng [3 ]
Yu, Qi [4 ]
Zhang, Shi-Hong [2 ,3 ]
机构
[1] Jiangxi Univ Sci & Technol, Fac Mat Met & Chem, Ganzhou 341000, Peoples R China
[2] Chinese Acad Sci, Ganjiang Innovat Acad, Ganzhou 341000, Peoples R China
[3] Chinese Acad Sci, Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, Shenyang 110016, Peoples R China
[4] Cent South Univ, Coll Mech & Elect Engn, Changsha 410083, Peoples R China
关键词
Cu-1Cr-0.1Zr alloy; La addition; Precipitation behavior; Mechanical properties; Electrical conductivity; HIGH ELECTRICAL-CONDUCTIVITY; GRAIN-REFINEMENT; SI ALLOY; MICROSTRUCTURE; PRECIPITATION; DUCTILITY; OPTIMIZATION; MECHANISMS; RESISTANCE; FCC;
D O I
10.1016/j.matchar.2024.114488
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The Cu-1Cr-0.1Zr alloy with different La addition (0 %, 0.07 % and 0.14 wt%) was processed using industry suitable two-step cold rolling and aging treatment to achieve superior strength and electrical conductivity. The role of La addition on the microstructure evolution and comprehensive properties of the Cu-1Cr-0.1Zr alloy is investigated during the second rolling and subsequent aging stages. During pre-aging process, the presence of La in the Cu-1Cr-0.1Zr-0.07La alloy led to formation of smaller precipitate sizes compared to La-free Cu-1Cr-0.1Zr alloy. This facilitates a stronger cut interaction between dislocations and precipitates during secondary rolling process, which promotes the redissolution of precipitates into Cu matrix and thus results in a larger decline of 44.72 % ICAS for the electrical conductivity of Cu-1Cr-0.1Zr-0.07La alloy. After post-aging treatment, precipitates are newly formed with increased number and refined size of Cr precipitates with maintaining a coherent relationship with the matrix. Besides, the addition of La promotes Cr-rich phase precipitation and dislocation accumulation. Resultantly, remarkable increase in tensile strength by 11 % with the addition of 0.07wt%La. While, the 0.14La added alloy exhibits comprehensive properties of tensile strength 600 MPa and electrical conductivity 80.08 %IACS after aging at 440 degrees C for 180 min. The increase in strength was primarily attributed to precipitation strengthening and dislocation strengthening. This work provides new kinds of Cu-1Cr-0.1Zr alloy and industrial suitable thermo-mechanical treatment for fabricating high performance cooper alloy sheets.
引用
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页数:12
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