In this study, 316L stainless steel (SS) specimens with different relative densities were fabricated using the spark plasma sintering (SPS) technique. These SPS specimens were used to capture the effect of microstructure heterogeneity on deformation and fracture behaviors during uniaxial tension. Microstructure analysis indicated that the SPS specimens consisted of fully sintered and partially sintered regions and contained initial pores which are located at the grain boundaries. Mini-tension tests combined with the digital image correlation (DIC) technique were carried out at room temperature to measure the mechanical properties of the SPS specimens and the evolution of strain heterogeneity on tensile specimens during uniaxial tension. In order to reveal the fracture mechanisms of the SPS specimens, the surfaces of the fractured specimens were analyzed via field emission scanning electron microscope (FE-SEM). The fracture mechanism in the fully sintered region was identified as a ductile fracture by the formation of cup-like dimples, while the fracture mechanism in the partially sintered region was identified as a decohesion of the interface between the powder and the matrix.

在这项研究中，使用火花等离子体烧结（SPS）技术制造了具有不同相对密度的316L不锈钢（SS）标本。这些SPS标本用于捕获微结构异质性对单轴拉伸过程中变形和断裂行为的影响。显微组织分析表明，SPS试样由完全烧结和部分烧结的区域组成，并包含位于晶界的初始孔。在室温下进行了微拉伸试验，并结合了数字图像相关技术（DIC），以测量SPS试样的机械性能以及单轴拉伸过程中拉伸试样上应变异质性的演变。为了揭示SPS标本的断裂机理，通过场发射扫描电子显微镜（FE-SEM）分析断裂试样的表面。通过形成杯状凹坑，将完全烧结区域的断裂机理鉴定为延性断裂，而将部分烧结区域的断裂机理鉴定为粉末与基体之间的界面脱粘。