形变热处理对7075铝合金连续流变挤压线材组织性能的影响  

Effects of Thermomechanical Treatment on Microstructure and Properties of 7075 alu⁃minum Alloy Wire Prepared by Continuous Rheological Extrusion

作　　者：李冰[1,2] 王家霖 张俊腾 王长峰 祁伟[1,2] 管仁国[1,2] LI Bing;WANG Jialin;ZHANG Junteng;WANG Changfeng;QI Wei;GUAN Renguo(Engineering Research Center of Continuous Extrusion,Ministry of Education,Dalian Jiaotong University,Dalian 116028;Key Laboratory of Near-Net Forming of Light Metals of Liaoning Province,Dalian Jiaotong University,Dalian 116028)

机构地区：[1]大连交通大学连续挤压教育部工程研究中心,大连116028 [2]大连交通大学辽宁省轻质金属材料近净成形重点实验室,大连116028

出　　处：《特种铸造及有色合金》2024年第9期1182-1186,共5页Special Casting & Nonferrous Alloys

基　　金：国家重点研发计划资助项目(2022YFB3706801,2022YFE0137900);辽宁省应用基础研究计划资助项目(2022JH2/101300003)。

摘　　要：采用形变热处理对连续流变挤压制备的7075铝合金线材组织性能进行调控。利用金相显微镜、扫描电镜、X射线衍射仪等研究形变热处理工艺对连续流变挤压7075铝合金线材组织性能的影响。结果表明,7075铝合金线材在470℃下固溶处理90 min后,Al基体上的第二相逐渐变少,剩余少量θ相分布在晶界处。随着断面减缩率不断增加,第二相在Al基体上呈弥散分布,η相不断析出在Al基体上,呈白色长条状弥散分布。对直径为ϕ4 mm线材进行120℃×4 h+160℃×13 h双级时效处理并继续拉拔至线材直径为ϕ3 mm时,伸长率略有下降,抗拉强度达到530.95 MPa。Microstructure and properties of 7075 aluminum alloy wire prepared by continuous rheological extrusion were controlled by thermomechanical treatment.Effects of processes on microstructure and properties of 7075 aluminum alloy wire by continuous rheological extrusion were investigated by metallographic microscope,scanning electron microscope and X-ray diffractometer.The results indicate that the second phase on Al matrix is gradually decreased after solution treatment at 470℃for 90 min,and a small amount of θ phase is distributed at the grain boundaries.With the increase of section reduction,the second phase is dispersed on the Al matrix,andηphase is continuously precipitated with white elongated dispersion.The two-stage aging treatment of 120℃×4 h+160℃×13 h was carried out on the wire with the diameter of wire reaching 4 mm,and the drawing continued,until the diameter of wire reaches 3 mm,where the elongation is reduced slightly,and tensile strength reaches 530.95 MPa.

关 键 词：连续流变挤压 形变热处理 组织性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG249.2[金属学及工艺—金属材料] TG156.93[金属学及工艺—金属学]