CAJ | 학술논문

本文在结合镁合金常用塑性加工工艺基础上，采用Gleeble一1500D热模拟机，在温度分别为573K、633K、693K，应变速率在0．05—10．8s^-1之间的条件下，对ME21镁合金进行高温快速拉伸试验。结果表明：合金的稳态流变应力随温度的升高而降低，随应变速率的增大而增大。同一应变速率下，峰值应力随温度的增高而出现得更晚。从应力应变曲线上也能反映合金在变形阶段产生了动态再结晶。在试验条件范围内合金的高温拉伸性能强度随变形温度的升高而减小，伸长率随变形温度的升高而增大。
본문재결합미합금상용소성가공공예기출상，채용Gleeble일1500D열모의궤，재온도분별위573K、633K、693K，응변속솔재0．05—10．8s^-1지간적조건하，대ME21미합금진행고온쾌속랍신시험。결과표명：합금적은태류변응력수온도적승고이강저，수응변속솔적증대이증대。동일응변속솔하，봉치응력수온도적증고이출현득경만。종응력응변곡선상야능반영합금재변형계단산생료동태재결정。재시험조건범위내합금적고온랍신성능강도수변형온도적승고이감소，신장솔수변형온도적승고이증대。
AThe tensile tests of ME21 magnesium alloy sheets were carried out in Gleeble-1500D simulation test at the temperatures of 573K, 633K and 693K at various strain rate between 0.05 s-l and 10.8 s^-l. Mechanical properties and microstrueture and the rela- tions among temperature, strain rate and flow stress were analyzed briefly. The results showed that flow stress increased with the in- crease of strain rate or with the decrease of temperature. Under a certain strain rate, the emerging of maximum stress had a conversion from earlier stage to later stage of plastic deformation with the increasing temperature. It could be affirmed that dynamic recrystallization had occurred in tensile test at elevated temperature from the true stress-true strain curves or from the microstructures after deformation. Tensile strength increased with the strain rate increasing or with the temperature decreasing, while the elongation did by contraries.