ABSTRACT Among refractory metals, tantalum has long been the primary material of use in high strain rate applications. Hot pressing (HP) is a technique to produce specimens with high density and homogeneous microstructure. The individual effect of the HP or annealing heat treatment on high strain rate properties of tantalum powder compacts has been investigated, but little attention has been paid to the combined effect of subsequent annealing. In this study, the effect of annealing on the microstructure and mechanical properties of tantalum subjected to hardness and Split Pressure Hopkinson Bar (SHPB) test was investigated. After annealing at 1100°C, the grains are coarsened, thereby hardness and upper yield strength decreased to value 199 VHN and 1833 MPa, respectively. Moreover, an obvious increase in plasticity and toughness is detected at this temperature, indicating subsequent annealing is beneficial to improve the deformation properties of HPed powder compacts; the maximum plasticity of tantalum was 31.74% after annealing.

中文翻译：

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热压及后续退火处理制备纯钽的显微组织及高应变速率行为研究

摘要 在难熔金属中，钽长期以来一直是高应变率应用中使用的主要材料。热压 (HP) 是一种生产具有高密度和均匀微观结构的试样的技术。已经研究了 HP 或退火热处理对钽粉压块高应变率性能的单独影响，但很少关注后续退火的综合影响。在这项研究中，退火对经受硬度和劈裂压力霍普金森棒 (SHPB) 试验的钽的显微组织和机械性能的影响进行了研究。在 1100°C 退火后，晶粒粗化，从而硬度和屈服强度分别降至 199 VHN 和 1833 MPa。而且，在该温度下检测到塑性和韧性明显增加，表明后续退火有利于改善HPed粉末压块的变形性能；退火后钽的最大塑性为31.74%。