室温大气环境下欠时效态3J21合金的拉伸性能

Tensile properties in under-aged state 3J21 alloy at room temperature in atmospheric conditions

在万能拉伸试验机上对室温大气环境下欠时效态3J21合金的拉伸性能进行研究,并采用金相显微镜、X射线衍射仪对欠时效态金相组织及物相进行分析,采用TEM对固溶态、欠时效态试样及拉伸断口附近形变的显微组织进行分析,采用扫描电镜(SEM)对拉伸断口进行观察。结果表明,室温大气环境下欠时效态3J21合金的拉伸断口为韧窝断口,断口附近显微组织中滑移线之间的距离较小。欠时效态3J21合金具有较好的强度和塑性配合。同时讨论了室温大气环境下欠时效状态对3J21合金拉伸性能的影响。

The tensile properties of 3J21 alloy in under-aged state was conducted on a universal tensile test machine at room temperature in atmospheric conditions.Moreover,a metallographic microscope and X-ray were used to analyze the metallographic structure and physical phase of the alloy in under-aged state.By employing a transmission electron microscope an analysis was conducted to the specimens of solid solution state and under-aged state as well as the microstructure of deformation near the tensile fracture.With the use of a scanning electron microscope a tensile fracture was observed.It was found that the tensile fracture of 3J21 alloy was a dimple fracture in under-aged state.The distance between the slip lines was smaller in the microstructure near the fracture of the alloy in under-aged state.The alloy in under-aged state featured a good match for the strength and plasticity.The influence of under-aged state on the tensile properties of 3J21 alloy is discussed at room temperature in atmospheric conditions.