|Revealing the deformation mechanisms of Cu-Al alloys with high strength and good ductility|
|Tian, Y. Z.; Zhao, L. J.; Park, N.; Liu, R.; Zhang, P.; Zhang, Z. J.; Shibata, A.; Zhang, Z. F.; Tsuji, N.; Tian, YZ (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Peoples R China.
|摘要||Fully recrystallized Cu-4 at.%Al alloy and Cu-11 at.%Al alloy with grain sizes ranging from 0.5 mu m to 80 mu m were fabricated by cold rolling and annealing. Tensile tests showed that yield strength, ultimate tensile strength and uniform elongation of the two Cu-Al alloys had linear relationships with the inverse square root of the grain size, and both the tensile strength and uniform elongation were ameliorated with decreasing the stacking fault energy. The strain-hardening curves of the Cu-4 at.%Al alloy shifted slightly with increasing the grain size, but the strain-hardening curves of the Cu-11 at.%Al alloy were very sensitive to the grain size. Microstructures of both alloys deformed to different tensile strains showed that the Cu-4 at.%Al alloy was favored by dislocation slip; in contrast, dislocation slip, stacking faults and deformation twins were widely observed in the Cu-11 at.%Al alloy, and their roles changed at different strain levels in the specimens with different grain sizes. Finally, mechanisms of achieving high strength and ductility in low-SFE materials were analyzed based on the strain-hardening behavior and deformation patterns. Optimal grain size ranges of 0.2-1 mu m for the Cu-4 at.%Al alloy and 1-3 mu m for the Cu-11 at.%Al alloy were proposed to achieve superior comprehensive mechanical properties. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.|
|部门归属||[tian, y. z.
; liu, r.
; zhang, p.
; zhang, z. j.
; zhang, z. f.] chinese acad sci, inst met res, shenyang natl lab mat sci, 72 wenhua rd, shenyang 110016, peoples r china
; [tian, y. z.
; zhao, l. j.
; park, n.
; shibata, a.
; tsuji, n.] kyoto univ, dept mat sci & engn, sakyo ku, yoshida honmachi, kyoto 6068501, japan
; [tian, y. z.
; shibata, a.
; tsuji, n.] kyoto univ, esism, sakyo ku, yoshida honmachi, kyoto 6068501, japan
; [zhao, l. j.] colorado sch mines, dept met & mat engn, adv steel proc & prod res ctr, golden, co 80401 usa
; [park, n.] yeungnam univ, sch mat sci & engn, gyongsan 712749, south korea
Stacking Fault Energy (Sfe)
; Metallurgy & Metallurgical Engineering
|资助者||National Natural Science Foundation of China (NSFC) [51331007, 51501198]; Elements Strategy Initiative for Structural Materials (ESISM); Ministry of Education, Culture, Sports, Science, and Technology (MEXT), Japan 
|通讯作者||Tian, YZ (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Peoples R China.|
Tian, Y. Z.,Zhao, L. J.,Park, N.,et al. Revealing the deformation mechanisms of Cu-Al alloys with high strength and good ductility[J]. ACTA MATERIALIA,2016,110:61-72.
Tian, Y. Z..,Zhao, L. J..,Park, N..,Liu, R..,Zhang, P..,...&Tian, YZ .(2016).Revealing the deformation mechanisms of Cu-Al alloys with high strength and good ductility.ACTA MATERIALIA,110,61-72.
Tian, Y. Z.,et al."Revealing the deformation mechanisms of Cu-Al alloys with high strength and good ductility".ACTA MATERIALIA 110(2016):61-72.