Im Yong-Deok, Park Kwang-Suk, Song Kuk-Hyun
Korea Institute of Industrial Technology, Gangneung Science Industry Park 106-11 Daejeon-Dong, Gangneung-si, Gangwon-do 25440, Korea.
Department of Welding and Joining Science Engineering, Chosun University, 309 Pilmun-daero, Dong-gu, Gwangju 61452, Korea.
J Nanosci Nanotechnol. 2018 Mar 1;18(3):2177-2180. doi: 10.1166/jnn.2018.14958.
This study was carried out to evaluate the development of microstructures and mechanical properties on friction welded dissimilar materials with a light weight. For this work, Al6063 and Duralumin alloys with a shape of rod were selected as experimental materials, and friction welding was performed under conditions with a rotation speed of 2,000 RPM, a friction load of 12 kgf/cm2 and an upset force of 25 kgf/cm2, respectively. After welding, the microstructural analysis such as the grain boundary characteristic distributions and the formation of intermetallic compounds was analyzed by electron back-scattering diffraction method and transmission electron microscopy, respectively. In addition, the evaluation of mechanical properties on welded materials was conducted by Vickers microhardness and tensile test. As a result, applying the friction welding led to the significant grain refinement from 50 μm in base material to 2 μm in welded zone, respectively. In case of mechanical properties, Vickers micro-hardness and tensile strength of the welded material occupied 81% and 96% in fraction relative to the base material, respectively, which was attributable to the formation and growth of intermetallic compounds during the welding.
本研究旨在评估轻质异种材料摩擦焊接后的微观结构发展和力学性能。为此，选择了棒状的Al6063和硬铝作为实验材料，并分别在转速为2000转/分钟、摩擦载荷为12千克力/平方厘米和镦粗力为25千克力/平方厘米的条件下进行摩擦焊接。焊接后，分别通过电子背散射衍射法和透射电子显微镜对晶界特征分布和金属间化合物的形成等微观结构分析。此外，通过维氏显微硬度和拉伸试验对焊接材料的力学性能进行评估。结果表明，采用摩擦焊接使得晶粒显著细化，从母材中的50微米分别细化至焊接区的2微米。在力学性能方面，焊接材料的维氏显微硬度和拉伸强度分别占母材的81%和96%，这归因于焊接过程中金属间化合物的形成和生长。
