材料期刊网

AIMg6Mn合金在剪切旋压过程中的变形行为与微观组织演变

中国有色金属学报 doi:10.1016/S1003-6326(11)61275-2

通过力学性能表征、光学显微镜和SEM电镜观察结合EDS分析,对AlMg6Mn合金在剪切旋压过程中的变形行为和微观结构进行研究.将样品在一工业旋压机上进行剪切旋压变形,压下量分别为30％,50％和68％.晶粒在剪切旋压过程中逐渐得到细化.随着压下量的增大,晶粒沿轴向拉长,沿圆周方向收缩.得到了最优的强度和伸长率,这归因于晶粒细化和固溶体中粒子与Mg、Mn原子之间的位错反应.

关键词: AlMg6Mn合金 , 剪切旋压 , 微观组织演变 , 变形行为 , 锯齿形屈服效应

Residual Stresses and Deformation Behaviour in a SiC_p/Al Composite

SUN Zhengming LI Jiabao WANG Zhongguang LI Weijie ZHOU Yanchun ** State Key Lab.for Fatigue and Fracture of Materials , Institute of Metal Research , Academia Sinica , Shenyang , 110015 , China+ To whom correspondence should be addressed

材料科学技术（英文）

Experiments were conducted to determine the residual stresses with X-ray diffraction in the ma- trix of a SiC/Al composite after different thermal treatments,and to investigate the stress-strain characteristics and fracture behaviour of the com- posite.It was found that there existed a tensile residual stress in the matrix and both thermal cy- cling between room temperature and 350℃ and low temperature treatment in liquid nitrogen reduced the residual stress.The results of the strength differential effect and Bauschinger effect were con- sistent with the results of residual stress measurements.The tensile residual stresses in the Al matrix enhanced the strength differential effect.The magnitude of Bauschinger effect is greater for a test initially started in compression than that in tension.

关键词: metal matrix composites , null , null