6008铝合金在不同挤压方向上的力学性能和断裂行为的研究  

Study on Tensile Behavior and Fractography of 6008 Al Alloy at Different Extruded Direction

作　　者：吴璐[1] 刘廷玉 董万鹏[1] 苏钰[1] 林杨胜蓝 龚红英[1] 

机构地区：[1]上海工程技术大学材料工程学院,上海201620 [2]上海航天控制技术研究所,上海200233

出　　处：《热加工工艺》2016年第2期53-55,59,共4页Hot Working Technology

基　　金：国家自然科学基金资助项目(51301105);上海工程技术大学校启项目2013-09[E1-0501-14-0109]

摘　　要：对与成形方向成0°、45°及90°三个方向的挤压型材在室温条件下进行宏观力学性能测试。通过S-3400N扫描电镜(SEM)观察拉伸试样靠近中心区域和边缘区域的断口形貌。结果显示,0°方向的屈服强度比90°方向小0.7MPa,45°方向的强度低于90°方向2.3 MPa。0°方向的σb、δ、和ψ分别比45°方向降低了1.2%、2.1%及3.9%,比90°方向降低了3.3%、5.7%及5.2%,在工程应用中认为该材料可以近似为各向同性。该材料的微观断裂方式是正断和剪断两种形式复合而成。中心区域的断裂模式是韧窝型断裂,边缘区域的断裂行为是韧窝型断裂和穿晶剪切断裂。The tensile test at the angle of 0°, 45°, 90° to the extrusion direction of material was implemented. The fracture morphology near the center region and edges region was observed by S-3400N scanning electron microscope （SEM）.The results show that the tensile strength at the angle of 0° is 0.7 MPa lower than at the angle of 90°. The yield strength at the angle of 90° is 2.3 MPa higher than the angle of 45°, and the value of δb,δ and ψ at the angle 0° is reduced by 1.2%, 2.1% and 3.9% in contrast to the angle 45°. In conclude, 6008 Al alloy material can be defined to be the isotropic material. The micro-fracture mode of the material is mixture mode of sheafing failure and normal failure. The fracture mode closing to the center area is dimple rupture and the fracture mode near the edge of the area is the mixture mode oftranscrystalline fracture and dimple fracture.

关 键 词：铝合金 力学性能 断裂行为 各向同性 统一拉伸断裂准则 椭圆准则 

分 类 号：TG146.21[一般工业技术—材料科学与工程]