EPS模型铝合金拉伸试样的力学性能研究

Study on Mechanical Properties of Tensile Specimens of Aluminum Alloy with EPS Pattern

采用自制蒸缸发泡成形连体式拉伸试样和空心直浇道的EPS模型,制备了ZL101A拉伸试样。对试样的力学性能、空序曲线、微应变云图、断口形貌和能谱进行了测试,对其相关性进行了分析和探讨。结果表明,径向表层5 mm内平均硬度62.63 HV50,抗拉强度121.0 MPa,弹性模量38325.0 MPa,泊松比0.41,断后伸长率1.93%。断口呈脆性断裂小缺口和塑性韧窝断裂两种形貌,脆性断裂区贫Al、Si,富C、O和N,韧性断口Al、Si含量接近ZL101A合金。

ZL101 A tensile specimen was prepared by means of EPS model and EPS model of hollow straight runner.The mechanical properties,empty overture,microstrain nephogram,fracture morphology and energy spectrum of the samples were tested,and their correlation was analyzed and discussed.The results show that average hardness of radial surface layer within 5 mm is 62.63 HV50,tensile strength is 121.0 MPa,elastic modulus is 38325.0 MPa,Poisson’s ratio is 0.41,elongation after fracture is 1.93%.The fracture is characterized by small brittle fracture gap and plastic dimpling fracture.The brittle fracture zone is poor in Al and Si,rich in C,O and N,and the contents of A1 and Si in the ductile fracture zone are close to those of ZL101 A alloy.