锻压技术

同温和异温挤压对7075/AZ31B复合管层厚均匀性及力学性能的影响

英文标题：Effect of isothermal and nonisothermal extrusion on layer thickness uniformity and mechanical properties for 7075/AZ31B composite tubes

作者：李朋1 2 3 王涛1 2 3 黄庆学1 2 3

单位：1.太原理工大学机械工程学院 2.太原理工大学先进金属复合材料成形技术与装备教育部工程研究中心 3. 太原理工大学金属成形技术与重型装备全国重点实验室

关键词：挤压温度 7075/AZ31B复合管层厚均匀性微观组织力学性能

分类号：TG376；TB331

出版年,卷(期):页码：2025,50(3):157-169

摘要：

为了实现7075/AZ31B复合管的高效制备，研究了挤压工艺对7075/AZ31B复合管的层厚均匀性及力学性能的影响。采用380和410 ℃异温和同温挤压成功制备了7075/AZ31B复合管，并进行了周向和轴向层厚均匀性分析和力学性能测试。研究发现，380 ℃同温挤压和410 ℃异温挤压管材内层AZ31B镁合金均具有较好的轴向和周向均匀性，并且380 ℃同温挤压的扩散层厚度为7.4 μm。380 ℃同温和异温挤压管材的力学性能优于410 ℃，380 ℃同温挤压管材的抗拉强度和伸长率分别为307 MPa和19.5%，380 ℃异温挤压管材的抗拉强度和伸长率分别为346 MPa和15.0%。研究结果表明,提高7075/AZ31B复合管的挤压温度不利于力学性能的提升。通过对比发现380 ℃同温挤压7075/AZ31B复合管既具有较好的层厚均匀性，还具有较好的力学性能。

In order to achieve the efficient fabrication of 7075/AZ31B composite tubes, the influences of extrusion process on the layer thickness uniformity and mechanical properties of 7075/AZ31B composite tubes were investigated. Then, 7075/AZ31B composite tube was successfully fabricated by isothermal and non-isothermal extrusion at 380 and 410 ℃. Furthermore, the uniformity of the circumferential and axial layer thicknesses was analyzed, and the mechanical properties were tested. The results show that the AZ31B magnesium alloys in the inner layer of the tubes formed at 380 ℃ with isothermal extrusion and 410 ℃ with non-isothermal extrusion simultaneously possess superior axial and circumferential uniformity, and the diffusion layer thickness for the tubes extruded isothermally at 380 ℃ is 7.4 μm. The mechanical properties of the tubes extruded isothermally and non-isothermally at 380 ℃ are superior to those extruded at 410 ℃. Specifically, the tensile strength and elongation of the tube extruded isothermally at 380 ℃ are 307 MPa and 19.5%, respectively, and those of the tube extruded non-isothermally at 380 ℃ are 346 MPa and 15.5%, respectively. The research results indicate that increasing the extrusion temperature of the 7075/AZ31B composite tube is not conducive to improving its mechanical properties. By comparison, it is found that the 7075/AZ31B composite tube extruded at 380 ℃ has both better layer thickness uniformity and mechanical properties.

基金项目：

国家自然科学基金区域联合重点项目(U22A20188)；国家杰出青年基金资助项目（52425504）

作者简介：李朋（1994-），男，博士研究生 E-mail：1604942439@qq.com 通信作者：王涛 (1985-)，男，博士，教授 E-mail：twang@tyut.edu.cn

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