CAJ | 학술논문

研究AZ31镁合金挤压板材在473～523K的温度范围内.应变速率0.001～1.0 s-1压缩时的流变应力行为,计算板材沿挤压方向压缩时的激活能,并结合光学显微镜和透射电子显微镜探讨合金软化机制和变形机理之间的联系.结果表明,在中温下沿挤压方向压缩时,AZ31挤压态镁合金的变形激活能为174.18 k J/mol.这说明,由热激活位错交滑移所控制的动态再结晶是合金中温变形的主要软化机制.位错滑移是中温变形的主要变形机理,而孪生的作用则不大.其主要的动态再结晶机制为持续动态再结晶,并伴随少量的孪生动态再结晶.
연구AZ31미합금제압판재재473～523K적온도범위내.응변속솔0.001～1.0 s-1압축시적류변응역행위,계산판재연제압방향압축시적격활능,병결합광학현미경화투사전자현미경탐토합금연화궤제화변형궤리지간적련계.결과표명,재중온하연제압방향압축시,AZ31제압태미합금적변형격활능위174.18 k J/mol.저설명,유열격활위착교활이소공제적동태재결정시합금중온변형적주요연화궤제.위착활이시중온변형적주요변형궤리,이련생적작용칙불대.기주요적동태재결정궤제위지속동태재결정,병반수소량적련생동태재결정.
The flow stress behavior of extruded AZ31 magnesium alloy sheet was investigated by means of compression tests at temperatures between 473 and 523 K and strain rates ranging from 0.001 to 1.0 s-1.The deformation activation energy of the sheet in extrusion direction (ED) was calculated,and the relationship between the softening effect and deformation mechanism was elucidated by optical microscopy and transmission electron microscopy.The results show that when the extruded AZ31 magnesium alloy samples were compressed at moderate temperatures in ED direction,the deformation activation energy is 174.18 kJ/mol,which means that dynamic recrystallization (DRX) is the main softening effect and is controlled by cross slip of thermal active dislocation.Dislocation slip is the main deformation mechanism in moderate-temperature deformation process except twinning.The main DRX effect at moderate temperatures can be considered to be continuous dynamic recrystallization accommodated with twinning DRX.