Enhanced strength-ductility combination in the aluminum-gold system by heterogeneous distribution of nanoparticles via ultra-severe plastic deformation and reactive interdiffusion  

作　　者：Abbas Mohammadi Xavier Sauvage Fabien Cuvilly Kaveh Edalati 

机构地区：[1]WPI,International Institute for Carbon-Neutral Energy Research(WPI-I2CNER),Kyushu University,Fukuoka,Japan [2]Univ Rouen Normandie,INSA Rouen Normandie,CNRS,Groupe de Physique des Matériaux,UMR6634,76000 Rouen,France

出　　处：《Journal of Materials Science & Technology》2024年第36期269-281,共13页材料科学技术(英文版)

摘　　要：Ultrafine-grained aluminum alloys are of interest due to their high strength-to-weight ratio,but they usually suffer from poor uniform ductility.In this study,an Al-Au alloy with a good combination of strength and ductility is produced by the heterogeneous distribution of Al2 Au nanoparticles in an alu-minum matrix.To generate such heterogeneity,the alloy is synthesized by ultra-severe plastic deforma-tion of aluminum and gold powders via the high-pressure torsion(HPT)method.Reactive interdiffusion occurs during the process leading to the heterogeneous formation of intermetallic particles and a good strength-ductility synergy(200 MPa yield stress and 15%uniform elongation).Nanoparticles gradually distribute within the matrix and once a uniform nanoparticle distribution is achieved,the alloy shows no further increase in strength,but it completely loses its ductility.It is concluded that not only the pres-ence of nanoparticles but more importantly the heterogeneity of their distribution can positively influ-ence the strength-ductility combination in ultrafine-grained aluminum alloys.The findings of this study suggest that future studies on heterogeneous precipitation hardening can be a solution to achieve ductile precipitation-hardened alloys.

关 键 词：Precipitate hardenable alloys Ultrafine-grained(UFG)materials Severe plastic deformation(SPD) Heterostructured materials Mechanical properties 

分 类 号：TG1[金属学及工艺—金属学]