Because of the difference in the coefficient of thermal expansion of Al alloy and SiC_p, the residual-stress generates during the process of fabricating Al alloy reinforced by SiC_p. The analyzing residual-stress quan...Because of the difference in the coefficient of thermal expansion of Al alloy and SiC_p, the residual-stress generates during the process of fabricating Al alloy reinforced by SiC_p. The analyzing residual-stress quantitatively by XRD shows that residual-stress is essential character of Al alloy reinforced by SiC_p, and the residual-stress in Al alloy matrix is tensile stress. The residual-stress decreases along with lessening of SiC_p size, which shows better microyield behavior. In annealing, the residual-stress of LY12+150#SiC_p is lower than that of ZL101+150#SiC, thus it has better microyield behavior. The residual-stress of solution-aging is bigger than that of annealing. The microyield behavior is also explained from the parameter change of microstructure to microyield behavior. Space-group relative microdistortion of Al alloy reinforced decreases along with lessening of SiC_p size, which has good microyield behavior.展开更多
An aluminum alloy (6061) matrix composite reinforced with 35% (vol.) Al 2O 3 particles was fabricated by squeeze casting method. The Al 2O 3 particles were spherical. The microyield behavior of the composite and t...An aluminum alloy (6061) matrix composite reinforced with 35% (vol.) Al 2O 3 particles was fabricated by squeeze casting method. The Al 2O 3 particles were spherical. The microyield behavior of the composite and the effect of different thermal cycling treatment on the microyield behaviors of the composite were studied. Based on TEM and HREM observation of microstructure, the mechanism of microyield behavior in the Al 2O 3p/6061 composite was analyzed. The results indicate that the microyield behavior of the Al 2O 3p/6061 composite can be described by Brown Lukens theory, which was used satisfactorily for aluminum alloys and other light alloys, and is affected greatly by the different thermal cycling treatment. The more the cycles of thermal cycling treatment, the higher to microyield strength at small strains. Thermal cycling treatment affects mainly the thermal mismatch stress and the density of movable dislocations in the matrix.展开更多
文摘Because of the difference in the coefficient of thermal expansion of Al alloy and SiC_p, the residual-stress generates during the process of fabricating Al alloy reinforced by SiC_p. The analyzing residual-stress quantitatively by XRD shows that residual-stress is essential character of Al alloy reinforced by SiC_p, and the residual-stress in Al alloy matrix is tensile stress. The residual-stress decreases along with lessening of SiC_p size, which shows better microyield behavior. In annealing, the residual-stress of LY12+150#SiC_p is lower than that of ZL101+150#SiC, thus it has better microyield behavior. The residual-stress of solution-aging is bigger than that of annealing. The microyield behavior is also explained from the parameter change of microstructure to microyield behavior. Space-group relative microdistortion of Al alloy reinforced decreases along with lessening of SiC_p size, which has good microyield behavior.
文摘An aluminum alloy (6061) matrix composite reinforced with 35% (vol.) Al 2O 3 particles was fabricated by squeeze casting method. The Al 2O 3 particles were spherical. The microyield behavior of the composite and the effect of different thermal cycling treatment on the microyield behaviors of the composite were studied. Based on TEM and HREM observation of microstructure, the mechanism of microyield behavior in the Al 2O 3p/6061 composite was analyzed. The results indicate that the microyield behavior of the Al 2O 3p/6061 composite can be described by Brown Lukens theory, which was used satisfactorily for aluminum alloys and other light alloys, and is affected greatly by the different thermal cycling treatment. The more the cycles of thermal cycling treatment, the higher to microyield strength at small strains. Thermal cycling treatment affects mainly the thermal mismatch stress and the density of movable dislocations in the matrix.
