Al-5Ti-1B合金等径角挤压变形的数值模拟及试验研究  

Numerical Simulation and Experimental Research on Deformation of Equal Channel Angular Pressing of Al-5Ti-1B Aluminum Alloy

作　　者：张文玉[1] 刘先兰[1] 伍杰[1] 

机构地区：[1]湖南工学院机械工程系,湖南衡阳421002

出　　处：《热加工工艺》2014年第7期104-107,共4页Hot Working Technology

基　　金：湖南省自然科学基金资助项目(10JJ3079);湖南省大学生研究性学习和创新性实验计划项目(湘教通[2012]402号-459)

摘　　要：采用Deform3D有限元软件,在模具外角0°、20°、30°和摩擦系数0、0.2、0.3条件下,对Al-5Ti-1B合金进行了等径角挤压(ECAP)变形过程的模拟,研究了ECAP变形合金的等效应变分布情况。模拟结果表明:摩擦系数相同,模具外角从0°增加到30°时,等效应变随模具外角的增加而下降;大摩擦系数比小摩擦系数条件下更容易获得均匀的变形。在模具内角90°、外角20°时,对Al-5Ti-1B合金进行了室温一道次等径角挤压,分析了等效应变分布对微观组织及力学性能影响。结果表明:合金经过ECAP挤压后,晶粒尺寸明显细化。屈服强度从142.0 MPa增加到195.3 MPa,提高了37.5%;硬度从45.2 HV增加到55.9 HV,提高了24%。Unders the condition of the die outer comer 0° 20°, 30° and the friction coefficient 0, 0.2, 0.3, the deformation processes of A1-5Ti-IB alloy equal channel angular pressing （ECAP） were simulated by using the finite element software Deform3D. The effective strain distribution of the alloy in ECAP deformation was researched. The simulation results show that： at the same friction coefficient and the die outer comer from 0° to 30°, the effective strains decrease with the increase of the die outer comer; the uniform deformation was obtained more easily under the conditions of large friction coefficient than that of small friction coefficient. Al-5Ti-IB alloy was squeezed by once path ECAP at room temperature under the die with the comer angle 90° and outer comer 20°. The effects of effective strain distribution on the microstructure and mechanical properties were analyzed. The results indicate that the grain size is obviously refined after the alloy ECAP; The yield strength has increased by 37.5% from 142.0 MPa to 195.3 MPa, and hardness has increased by 24% from 45.2 HV to 55.9 HV.

关 键 词：Al-5Ti-1B合金 等径角挤压(ECAP) 模拟 

分 类 号：TG376.3[金属学及工艺—金属压力加工]