论文部分内容阅读
对Al-6%Mg合金超塑性变形机制进行了定量研究。试验中观察到晶界滑移和晶粒转动、扩散蠕变、位错及动态再结晶等现象。从观测及计算结果表明,在最佳超塑性变形速率区(Ⅱ区)、晶界滑移与晶粒转动对总变形量的贡献最大,可达到63%;扩散蠕变的贡献可达31%;其余为位错滑移及动态再结晶等的贡献。证实了Al-6%Mg合金在超塑性变形过程中,以晶界滑移与晶粒转动为主要变形机制;其它为调节机制。在试验的应变速率ε范围内(1.67×10~(-4)s~(-1)～1.67×10~(-1)s~(-1),几种变形量均发现位错存在。位错密度随应变速率和变形量的增加而增大。
The mechanism of superplastic deformation of Al-6% Mg alloy was studied quantitatively. Grain boundary slip and grain rotation, diffusion creep, dislocation and dynamic recrystallization were observed in the experiment. The results of observation and calculation show that grain boundary slip and grain rotation have the largest contribution to the total deformation at 63% of the maximum superplastic deformation rate zone (zone Ⅱ), and the contribution of diffusion creep up to 31% ; The rest is the contribution of dislocation slip and dynamic recrystallization. Confirmed the Al-6% Mg alloy in superplastic deformation process, the grain boundary slip and grain rotation as the main deformation mechanism; the other for the regulation mechanism. In the range of strain rate ε (1.67 × 10 ~ (-4) s ~ (-1) ~ 1.67 × 10 ~ (-1) s ~ (-1) The error density increases with the increase of strain rate and deformation.