摘要
采用Gleeble-1500D热模拟机对Mg-13Gd-4Y-2Zn-0.5Zr合金两种形状试样在温度为400-450℃、应变速率为1s-1、变形量为28%-77%条件下的热变形行为进行研究。研究结果表明：试样形状导致试验合金应力状态不同,对热压缩断裂行为产生明显影响;法兰试样产生纵裂,圆锥试样产生与轴线呈45°角方向斜裂;锥形试样真应力-应变曲线中出现稳态流变阶段,应变增大,曲线再次上升;法兰试样流变应力呈线性上升趋势;法兰试样内整体晶粒变形均匀性较差,圆锥试样变形均匀,存在明显的变形流线。
The Gleeble-1500 D thermal simulator was employed to study thermal deformation behavior of Mg-13Gd-4Y-2Zn-0.5Zr alloy with two types of geometries under the temperatures of 400-450 ℃,strain rate of 1 s-1,and deformation of 28%-77%. The results show that different geometries lead to different states of stress for tested alloys,which obviously affect the thermal compression fracture. Flanged sample exhibits longitudinal crack,while tapered sample yields oblique crack at an angle of 45°.For tapered sample,stress first remains almost unchanged as strain increases in the true stress-strain curve,and then increases again with strain. For flanged sample,the flow stress increases in a linear manner with strain. Flanged sample shows weak uniformity in terms of its overall grain deformation,while tapered sample deforms uniformly and has deformation streamlines.
出处
《兵器材料科学与工程》
CAS
CSCD
北大核心
2016年第2期47-51,共5页
Ordnance Material Science and Engineering
基金
山西省自然科学基金(2013011022-5)
