作者机构：
[张敏] College of Mechanical Engineering, Wuhan Polytechnic University, Wuhan;430048, China;[张祥] The First Construction Company, CCCC Second Harbor Engineering Co., Ltd., Wuhan;430012, China;[赵延杰; 张伦平] China Ship Scientific Research Center, Wuxi
通讯机构：
[Zhang, M.] C;College of Mechanical Engineering, Wuhan Polytechnic University, Wuhan, China
作者机构：
[Mei, Q. S.; Xu, T.; Chen, F.; Chen, Z. H.; Li, C. L.; Wang, Y. C.; Mei, X. M.; Tan, Y. Y.; Wan, L.] Wuhan Univ, Sch Power & Mech Engn, Wuhan 430072, Peoples R China.;[Mei, Q. S.] Wuhan Univ, Minist Educ, Key Lab Hydraul Machinery Transients, Wuhan 430072, Peoples R China.;[Li, J. Y.] Wuhan Polytech Univ, Sch Mech Engn, Wuhan 430023, Peoples R China.
通讯机构：
[Q.S. Mei] S;School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China<&wdkj&>Key Laboratory of Hydraulic Machinery Transients (Wuhan University), Ministry of Education, Wuhan 430072, China
摘要：
In this study, a novel solid-state alloying approach was adopted to fabricate Al-Mg alloys with high Mg contents (C-Mg) by accumulative roll-bonding (ARB) of Al and Mg elemental materials to ultrahigh cycles. Experimental results showed that the degree of alloying increased with the increase of ARB cycles and a supersaturated alpha-Al solid solution accompanied with nanoprecipitates was formed in the Al-Mg alloys by ARB to 70 cycles. The as-prepared Al-Mg alloys exhibited enhanced mechanical properties, with a maximum tensile strength of similar to 615 MPa and a tensile elongation of similar to 10% at C-Mg = 13 wt.%. The high strength can be attributed to different mechanisms, namely solid solution strengthening, grain boundary strengthening, dislocation strengthening, and precipitation strengthening. The Al-Mg alloys showed increased work hardening with increasing C-Mg, due to the enhanced formation of nanoprecipitates. Meanwhile, no obvious drop in the intergranular corrosion (IGC) resistance was found in the Al-Mg alloys with C(Mg)up to 13 wt.%. Moreover, sensitization treatment was found to induce little decrease in the IGC resistance of the Al-Mg alloys with C-Mg <= 13 wt.%. We found that the excellent IGC resistance was due to the suppression of grain boundary precipitation by the preferred formation of precipitates within the grains that were induced by ARB. Our study indicated the novelty of the present solid-state alloying approach to achieving a superior combination of high mechanical properties and IGC resistance in Al-Mg alloys. (C) 2022 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
作者机构：
[Hui, Han-Yu; Li, Cheng-Lin; Ma, Ye; Chen, Feng; Mei, Xin-Ming; Mei, Qing-Song; Chen, Zi-Hao; Li, CL] Wuhan Univ, Sch Power & Mech Engn, Wuhan 430072, Peoples R China.;[Li, Ju-Ying] Wuhan Polytech Univ, Sch Mech Engn, Wuhan 430023, Peoples R China.;[Choi, Seong-Woo] Korea Inst Mat Sci, Adv Met Div, Chang Won 51508, South Korea.
通讯机构：
[Li, CL; Mei, QS] W;Wuhan Univ, Sch Power & Mech Engn, Wuhan 430072, Peoples R China.
关键词：
Aluminum matrix composites;Graphene nanoplatelets;Accumulative roll compositing;Electrical conductivity;Mechanical properties
摘要：
Aluminum matrix composites（AMCs） reinforced with graphene nanoplatelets（GNPs） were fabricated by using an accumulative roll-compositing（ARC） process.Microstructure, mechanical and electrical properties of the nanostructured AMCs were characterized. The results showed that small addition（0.2 vol% and 0.5 vol%） of GNPs can lead to a simultaneous increase in the tensile strength and ductility of the GNPs/Al nanocomposites, as compared with the same processed pure Al. With increasing GNPs content, the tensile strength of the GNPs/Al nanocomposites can be enhanced to 387 MPa with retained elongation of 15%. Meanwhile, the GNPs/Al nanocomposites exhibited a good electrical conductivity of77.8%–86.1% that of annealed pure Al. The excellent properties（high strength, high ductility and high conductivity） of the GNPs/Al are associated with the particular ARC process, which facilitates the uniform dispersion of GNPs in the matrix and formation of ultrafine-grained Al matrix. The strengthening and toughening of the GNPs/Al nanocomposites were discussed considering different mechanisms and the unique effect of GNPs.
