文献类型：期刊文献

英文题名：Effect of aging plus cryogenic treatment on the machinability of 7075 aluminum alloy

作者：Zhang, Ping[1,2];Liu, Zehua[1];Liu, Junling[2,3];Yu, Jiang[1];Mai, Qingqun[1];Yue, Xiujie[2]

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

年份：2023

卷号：208

外文期刊名：VACUUM

收录：SCI-EXPANDED(收录号：WOS:000899896000001)、、EI(收录号：20225013247150)、Scopus(收录号：2-s2.0-85143778316)、WOS

基金：The work was supported by the National Natural Science Foundation of China(51705270), the National Natural Science Foundation of China (No.51575289),the Natural Science Foundation of Shandong Province (No.ZR2016EEP03),the Applied Basic Research Program of Qingdao city (No.19-6-2-69-cg) and Shandong Qingchuang Science and Technology Project(No.2019KJB022).

语种：英文

外文关键词：Cryogenic treatment; 7075 aluminum alloy; Surface quality; Microstructure; Precipitates

外文摘要：This work aims to explore the effect of aging plus cryogenic treatment on the machinability of 7075 aluminum alloy in high speed cutting. First, 7075 aluminum alloy samples are pretreated by T6 and T6I4. Then they are cryogenically treated under - 196 degrees Cfor 168 h. After heat and cryogenic treatment, the samples are experimen-tally cut at high speed. Samples having received only T6 or T6I4 treatment are selected as the control groups. Surface quality and microstructure evolution are analyzed by SEM, EDS, XRD, TEM, and HRTEM means. The results show that the cutting force of 7075 aluminum alloy is significantly smaller than without cryogenic treatment after cryogenic treatment,; the cutting force of T6-state alloy is 1.25 times as much as the T6I4-state alloy. Under the same cutting parameters, cryogenically treated 7075-T6I4 aluminum alloy has a smaller grain size and contains more precipitates in the aluminum matrix, which are eta-MgZn2. The precipitated phase size of T6 is about 80 nm, about 2.5 times that of T6I4.After T6 and T6I4-state samples are cryogenically treated, the alloy precipitate size is about the same as-or slightly smaller than-the grain size of the alloy without cryogenic treatment, but the precipitates are denser and discontinuous. After T6 and T6I4 heat treatment, distinctive stacking fault arises in the machined surface. After cryogenic treatment, the stacking fault is greatly improved.