轧制应变速率对2A14铝合金组织和力学性能的影响  

Effect of Rolling Strain Rate on Microstructure and Mechanical Properties of 2A14 Aluminum Alloy

作　　者：张鹏[1] 段宏钢 张丽娜 魏文庆[1] 鲍文科 ZHANG Peng;DUAN Honggang;ZHANG Li'na;WEI Wenqing;BAO Wenke(School of Electromechanical and Vehicle Engineering,Weifang University,Weifang 261061,China;Department of Mechanical and Electrical Engineering,Shandong Vocational College of Science and Technology,Weifang 261053,China)

机构地区：[1]潍坊学院机电与车辆工程学院,山东潍坊261061 [2]山东科技职业学院机电工程系,山东潍坊261053

出　　处：《热加工工艺》2021年第15期91-93,共3页Hot Working Technology

基　　金：山东省自然科学基金项目(ZR2019BEE060);潍坊市科技发展计划项目(2020GX011);潍坊学院博士科研基金项目(2017BS12)。

摘　　要：对2A14铝合金进行了420℃不同应变速率的3道次热轧试验,采用OM、SEM、万能试验机研究了不同应变速率对合金组织与力学性能的影响。结果表明:应变速率1 s-1轧制时,合金晶粒沿轧制方向被拉长。应变速率达到5s-1时,晶粒明显细化,晶粒基本呈等轴状。轧制应变速率继续升高,合金晶粒尺寸无明显变化。随着轧制应变速率的增加,T6态2A14铝合金的抗拉强度与屈服强度先升高后降低,伸长率先降低后升高。应变速率为5 s-1时,合金的抗拉强度与屈服强度达到最大值,分别为454和356 MPa。Three passes hot rolling tests of 2A14 aluminum alloy at 420℃ with different strain rates were carried out. The effect of different strain rates on the microstructure and mechanical properties of the alloy was studied by OM, SEM and universal testing machine. The results show that the grains of the alloy are elongated along the rolling direction when the strain rate is 1 s-1. When the strain rate reaches 5 s-1, the grains are obviously refined, and the grains are basically equiaxed, and the grain size of the alloy has no obvious change with the continuous increase of rolling strain rate. With the increase of rolling strain rate, the tensile strength and yield strength of 2A14 aluminum alloy of T6 state first increase and then decrease, and the elongation first decreases and then increases. When the strain rate is 5 s-1, the tensile strength and yield strength of the alloy reach the maximum value, which are 454 and 356 MPa respectively.

关 键 词：2A14铝合金 轧制应变速率 晶粒 力学性能 

分 类 号：TG335.1[金属学及工艺—金属压力加工]