钢丝增强AZ91复合材料的力学性能

为了提高AZ91镁合金的力学性能，采用浸入铸造法制备了体积分数为3.3%的不锈钢纤维增强AZ91复合材料，并在相同条件下对AZ91及其复合材料进行了热挤压处理.采用扫描电镜（SEM）和力学性能试验机分别对铸态和挤压态材料的显微组织、断口和拉伸性能进行了研究.结果表明：铸态AZ91及其复合材料的抗拉强度分别为250和240MPa.然而经过挤压后，钢丝增强AZ91镁合金的屈服强度和抗拉强度分别达到了375和428.6MPa，与挤压态AZ91和铸态AZ91复合材料相比，分别提高了50%、20%和57.6%、78.6%.同时挤压态复合材料的塑性变形量也显著提高.

Mechanical properties of stainless steel fiber reinforced AZ91 composite

In order to enhance the mechanical properties of AZ91 magnesium alloy,the stainless steel fiber reinforced AZ91 composite with 3.3 vol.% steel fiber was prepared with immersion casting method.Furthermore,the AZ91 alloy and its composite were hot extruded under the same condition.The microstructures,fracture surfaces and tensile properties of as-cast and as-extruded AZ91 alloy and composite were investigated with scanning electron microscope(SEM) and mechanical property tester,respectively.The results show that the ultimate tensile strengths of as-cast AZ91 alloy and stainless steel fiber reinforced AZ91 composite are 250 MPa and 240 MPa,respectively.However,the yield strength and ultimate tensile strength of as-extruded stainless steel fiber reinforced AZ91 composite reach 375 MPa and 428.6 MPa,respectively.Compared with as-extruded AZ91 alloy and as-cast AZ91 composite,the yield strength and ultimate tensile strength of the composite increase by 50%,20% and 57.6%,78.6%,respectively.Meanwhile,the plastic deformation amount of as-extruded composite gets improved obviously.