CAJ | 학술논문

通过 Gleeble?3500热压缩试验机对 AZ31镁合金进行热压缩实验,得到温度为300、350、400、450和500℃,应变速率为0.03、0.3、和3 s?1的流变应力曲线.对流变应力曲线进行图形变换求解出不同应变速率下的回复参数 r,求得的回复参数的自然对数 lnr 与温度的倒数1/T 成线性相关.结果表明:可以采用修正的Laasraoui-Jonas(L-J)位错密度模型计算 AZ31镁合金动态再结晶过程中的位错密度演变;修正的 L-J 位错密度模型结合元胞自动机(CA)能精确地模拟位错密度动态再结晶过程.
통과 Gleeble?3500열압축시험궤대 AZ31미합금진행열압축실험,득도온도위300、350、400、450화500℃,응변속솔위0.03、0.3、화3 s?1적류변응력곡선.대류변응력곡선진행도형변환구해출불동응변속솔하적회복삼수 r,구득적회복삼수적자연대수 lnr 여온도적도수1/T 성선성상관.결과표명:가이채용수정적Laasraoui-Jonas(L-J)위착밀도모형계산 AZ31미합금동태재결정과정중적위착밀도연변;수정적 L-J 위착밀도모형결합원포자동궤(CA)능정학지모의위착밀도동태재결정과정.
@@@@The hot compression tests of AZ31 magnesium alloy were performed on the Gleeble?3500 machine to obtain the flow stress curves under temperatures of 300, 350, 400, 450 and 500 ℃ and strain rates of 0.03, 0.3 and 3 s?1. The recovery parameter (r) under different strain rates were calculated by transformation of flow stress curves. A linear correlation between lnr and 1/T was observed. The results show that the modified Laasraoui-Jonas (L-J) dislocation density equation can be employed to calculate the dislocation evolution during dynamic recrystallization of AZ31 magnesium alloy. The results simulated from modified L-J dislocation density model coupled with Cellular Automata (CA) method are well matched with the experimental results.