文献类型：期刊文献

英文题名：Study on the influence of multi-energy field combined surface modification on the subsurface microstructure evolution of AA7075 aluminum alloy

作者：Zhang, Ping[1];Yue, Xiujie[2,3];Jiang, Xiaomin[1];Sun, Yajie[1];Wang, Youqiang[2]

机构：[1]Guangdong Ocean Univ, Coll Mech & Power Engn, Zhanjiang, Peoples R China;[2]Qingdao Univ Technol, Coll Intelligent Mfg, Qingdao 266520, Peoples R China;[3]Qingdao Huanghai Univ, Coll Intelligent Mfg, Qingdao 266520, Peoples R China

年份：2025

卷号：219

外文期刊名：MATERIALS CHARACTERIZATION

收录：SCI-EXPANDED(收录号：WOS:001389642700001)、、EI(收录号：20245117537403)、Scopus(收录号：2-s2.0-85212002780)、WOS

基金：The work was supported by the National Natural Science Foundation of China (51705270) and the Natural Science Foundation of Shandong Province (No. ZR2022QE149) . The Natural Science Foundation of Shandong Province (No. ZR2022QE149) .

语种：英文

外文关键词：AA7075 aluminum alloy; Multi-energy field strengthening; Residual stress; Microstructural evolution; Dislocation

外文摘要：This study examines the combined surface modification of AA7075 aluminum alloy using the ultrasonic impact treatment-solid particle embedded water jet (UIT-SPEWJ) technique. Through XRD, TEM, and HRTEM analyses, we investigated the effects of UIT-SPEWJ combined surface modification parameters on residual stress, phase types, dislocation evolution, and microstructure.In the initial phase of UIT surface modification, increased ultrasonic frequency significantly refined grains, broadened the diffraction peak of the alpha-Al phase, reduced peak intensity, and increased eta-MgZn2 phase precipitation. Dislocation density rose from 3.01 x 1014 m- 2 to 3.17 x 1014 m- 2. During the surface modification process of SPEWJ, as the jet pressure increased from 20 MPa to 40 MPa, the grain refinement became more significant, and the dislocation density further increased to 4.18 x 1014 m- 2.The surface residual compressive stress also shows an increasing trend with the increase of jet pressure, with the maximum residual compressive stress increasing from -593.72 MPa to -786.07 MPa, and the depth of the residual compressive stress layer reaching 493 mu m.During the UIT-SPEWJ composite modification process, a high-density dislocation network and entanglement were formed on the surface of the material, with precipitates ranging in size from 20 to 50 nm and evenly distributed. In the SPEWJ stage, the size of the precipitated phase is further reduced to 10-30 nm, with a more uniform distribution, and the PFZ size is reduced by about 3 nm.In addition, the enrichment degree of Zn element in the precipitation phase is relatively high, while the distribution of Al element is relatively uniform, and the distribution of Cu and Mg elements is relatively sparse.The UITSPEWJ technology significantly improves the surface structure and properties of AA7075 aluminum alloy. Through grain refinement, increased dislocation density, uniform distribution of precipitated phases, and optimization of residual compressive stress, it indicates that this composite modification technology has important application prospects in improving material mechanical properties.