标题：Amorphization of Al-Cu-Mg alloys by friction stir welding
作者：Feng, K.; Liu, P.; Xia, C.; Cao, M.; Jing, C.; Zhang, G.
作者机构：[Feng, K.; Liu, P.; Jing, C.; Zhang, G.] Shandong Jianzhu Univ, Sch Mat Sci & Engn, Jinan 250101, Shandong, Peoples R China.; [Xia, C.] Jiangsu Univ 更多
通讯作者地址：[Liu, P]Shandong Jianzhu Univ, Sch Mat Sci & Engn, Jinan 250101, Shandong, Peoples R China.
来源：KOVOVE MATERIALY-METALLIC MATERIALS
关键词：friction stir welding; amorphous structure; transmission electron; microscopy; X-ray diffraction; microstructure
摘要：The microstructure and phase constituents in stir zone of friction stir weld for 2024-T4 aluminium alloys were observed and analysed by transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM) and X-ray diffraction analysis. Homogeneous amorphous structure in some area of the weld nugget zone was detected. The amorphous structure with halo pattern has a structure characteristic of the long-range disorder. X-ray diffraction analysis indicated that a diffuse scattering peak in the shape of steamed bun with amorphous characteristic exists in the degree scope of 15 degrees-29 degrees. Some influencing factors, such as higher temperature gradient, hydrostatic pressure and shear stress and strain, may induce the formation of amorphous structure in weld nugget zone of friction stir weld.