高密度脉冲电流处理对6N01铝合金组织和性能的影响  

Effect of High-density Electropulsing Current Treatment on Microstructure and Properties of 6N01 Aluminum Alloy

作　　者：王贯盈 孙卓彬 梁永梅 彭珍珍 梁志敏 WANG Guanying;SUN Zhuobin;LIANG Yongmei;PENG Zhenzhen;LIANG Zhimin(School of Materials Science and Engineering,Hebei University of Science and Technology,Hebei Key Laboratory of Material Near-Net Forming Technology,Shijiazhuang 050018,China)

机构地区：[1]河北科技大学材料科学与工程学院,河北省材料近净成形技术重点实验室,河北石家庄050018

出　　处：《热加工工艺》2023年第8期54-59,共6页Hot Working Technology

基　　金：国家自然科学基金资助项目(51875168);河北省自然科学基金资助项目(E2020208089);船舶智能制造关键共性工艺研究项目(MC-201704-Z02)。

摘　　要：探讨了电流密度对6N01铝合金晶粒、拉伸性能、硬度和强化相的影响。结果表明,试样经150、200、250A/mm2的脉冲电流处理后均发生晶粒细化,电流密度为200 A/mm^(2)时,晶粒的细化效果最好。随着电流密度的增大,6N01铝合金塑性逐渐增加,强度和硬度逐渐下降。电流密度为250 A/mm^(2)时,原始态的伸长率由12.3%增长至13.6%,屈服强度由254.6 MPa降至117.3 MPa,抗拉强度由286.3 MPa降至190.9 MPa,硬度由87 HV降至53 HV。电流密度和处理时长均对Portevin-Le Chatelier(PLC)效应存在影响,电流密度越大或处理时长越长,PLC效应越显著。高密度脉冲电流处理可导致强化相快速溶解,且溶解程度随电流密度的增加而增大。The effects of current density on the grain size,tensile properties,hardness and strengthening phase of 6N01 aluminum alloy were investigated.The results show that the grain refinement occurs after the pulse current treatment of 150 A/mm^(2),200 A/mm^(2) and 250 A/mm^(2).And the grain refinement effect is strongest when the current density is 200 A/mm^(2).In addition,as the current density increases,the plasticity of 6N01 aluminum alloy gradually increases,while the strength and hardness gradually decrease.When the current density is 250 A/mm^(2),the elongation of the original state increases from 12.3% to 13.6%,the yield strength decreases from 254.6 MPa to 117.3 MPa,the tensile strength decreases from 286.3 MPa to 190.9 MPa,and the hardness decreases from 87 HV to 53 HV.Both the current density and processing time have an impact on the Portevin-Le Chatelier(PLC)effect,The higher the current density or the longer the processing time,the more obvious the PLC effect.The high-density pulsed current treatment can quickly dissolve the strengthening phase,and the degree of dissolution increases with the current density increasing.

关 键 词：6N01铝合金 电脉冲处理 晶粒细化 PLC效应 强化相溶解 

分 类 号：TG156.7[金属学及工艺—热处理]