挤压工艺对Mg-2Gd-Zr镁合金组织性能的影响  

Effect of Extrusion Deformation on Microstructure and Properties of Mg-2Gd-Zr Magnesium alloy

作　　者：王世伟 孙鑫 王煜烨 齐曦曦 卜春成 杨力祥 周海涛 肖旅[1] WANG Shiwei;SUN Xin;WANG Yuye;QI Xixi;BU Chuncheng;YANG Lixiang;ZHOU Haitao;XIAO Lv(Shanghai Spaceflight Precision Machinery Institute,Shanghai 201600,China)

机构地区：[1]上海航天精密机械研究所,上海201600

出　　处：《上海航天(中英文)》2024年第S2期95-100,共6页Aerospace Shanghai(Chinese&English)

基　　金：上海市青年科技英才扬帆计划(23YF1417100)

摘　　要：高塑性镁合金可用于制备航天器的支架、舱盖等非主承力结构件,具有安全可靠的特性。高塑性镁合金还可以用于制造油气压裂作业中需求量极大的桥塞构件中的卡瓦、球座、胶筒等产品,可避免泄露,实现油气开采过程的顺利进行。本文研究挤压工艺对Mg-2Gd-Zr镁合金组织与力学性能的影响。研究结果表明,热挤压工艺对Mg-2Gd-Zr镁合金显微组织和力学性能影响较大:在350°C挤压时,挤压比越大,显微组织平均晶粒尺寸越小,细小再结晶晶粒越多;在350°C挤压时,挤压比对力学性能的影响主要体现在断后延伸率上。采用挤压温度为350℃、挤压比为16制备的材料抗拉强度为182 MPa,断后伸长率为43.6%,其可以用于制备卡瓦、球座等产品;采用挤压温度为300℃、挤压比为16制备的材料抗拉强度为272 MPa,断后伸长率为21.4%,其可以用于制备舱盖、端盖等产品。High-plasticity magnesium alloys can be used to prepare non-main bearing structural parts such as brackets and hatch covers widely used in aerospace field to ensure the safety and reliability.It can also be applied to slips,ball seats,rubber tubes and other products in bridge plug components with large demand in oil and gas fracturing operation to ensure effective plugging of oil and gas exploitation.In this paper,the effects of extrusion deformation on microstructure and mechanical properties of Mg-2Gd-Zr magnesium alloy were studied.The results show that the hot extrusion has a great influence on microstructure and mechanical properties of Mg-2Gd-Zr magnesium alloy.When extruded at 350°C,the larger the extrusion ratio is,the smaller the average grain size is,and the more fine recrystallized grains are contained.When extruded at 350°C,the effect of extrusion ratio on mechanical properties is mainly reflected in the elongation.The tensile strength of the material prepared at the extrusion temperature of 350°C and the extrusion ratio of 16 is 182 MPa,and the elongation is 43.6%,which can be used to prepare slips,ball seats and so on.The tensile strength of the material prepared by extrusion temperature of 300°C and extrusion ratio of 16 is 272 MPa,and the elongation is 21.4%,which can be used to prepare brackets,hatch covers,etc.

关 键 词：Mg-2Gd-Zr镁合金 热挤压 动态再结晶 显微组织 力学性能 

分 类 号：TG379[金属学及工艺—金属压力加工]