Improvement of microstructure and mechanical properties of dissimilar friction stir welded aluminum/titanium joints via aluminum oxide nanopowder

被引：28
作者：
Shehabeldeen, Taher A. [1 ,2 ]
El-Shafai, Nagi M. [3 ]
El-Mehasseb, Ibrahim M. [3 ]
Yin, Yajun [1 ]
Ji, Xiaoyuan [1 ]
Shen, Xu [1 ]
Zhou, Jianxin [1 ]
机构：
[1] Huazhong Univ Sci & Technol, State Key Lab Mat Proc & Die & Mould Technol, Wuhan 430074, Hubei, Peoples R China
[2] Kafrelsheikh Univ, Fac Engn, Dept Mech Engn, Kafrelsheikh 33516, Egypt
[3] Kafrelsheikh Univ, Fac Sci, Chem Dept, Nanotechnol Ctr, Kafrelsheikh 33516, Egypt
来源：
VACUUM | 2021年 / 188卷
基金：
中国国家自然科学基金;
关键词：
Al/Ti dissimilar alloys; gamma-Al2O3; nanopowder; Friction stir processing; Friction stir welding; Mechanical properties; VECTOR FUNCTIONAL-LINK; HEAT-TREATMENT; BEHAVIOR; ALLOY; PARAMETERS; EVOLUTION; DIFFUSION; STRENGTH; AA7075;
D O I：
10.1016/j.vacuum.2021.110216
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Aluminum oxide nanopowder has been fabricated and characterized successfully to improve the properties of friction stir welded aluminum/titanium joints, which pose a great challenge due to the great difference in mechanical properties. Intermetallic compounds (IMCs) of large sizes formed at the welding interface are a significant problem that deteriorates joint strength due to the uncontrollable thermal effect generated in the joint. Therefore, friction stir processing was integrated with friction stir welding, in which a dissimilar lap joint of AA6061-T6 and Ti6Al4V was reinforced with gamma-Al2O3 nanoparticles of about 8 nm in diameter. First, several attempts were conducted to determine the most effective parameters in the welding process of the aluminum/titanium reinforced joint and then the effects of gamma-Al2O3 nanopowder on microstructure, mechanical properties, and weldability were analyzed and compared to a welded joint without reinforcing powder. Sound joints have been successfully produced using welding speed of 25 mm/min, and tool rotational speed of 600 rpm. Lap shear fracture load and displacement of the Al/Ti joint increased from 3.5 KN and 1.25 mm to 3.7 KN and 2.45 mm, respectively, while the hardness of the reinforced joint increased from 384 HV to 391 HV at the Al/Ti weld interface with a remarkable improvement at the Al and Ti sides.
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页数：11
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