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采用雾化干燥法和两步烧结法制备了一种晶粒度约20μm的95 W细晶钨合金棒材,利用分离式Hopkinson压杆(SHPB)对细晶钨合金进行高应变率的动态力学性能研究,并与传统钨合金进行对比,分析了应变及应变率对动态性能的影响。结果表明,尽管细晶95W的强度极限σb和延伸率δ较传统95 W都低,而在高应变率下,细晶95 W的最大应力σmax要高于传统钨合金,最大应变εmax只有较少的下降。高应变率下细晶95 W出现应变硬化和热软化两种竞争效应,在较低应变时,应变硬化占主导,最后热软化后出现应力急剧下降。
A 95 W fine grain tungsten alloy bar with a grain size of about 20 μm was prepared by atomization drying and two-step sintering. The high-strain-rate dynamic mechanics of the fine grain tungsten alloy was achieved by using a split Hopkinson pressure bar (SHPB) Performance study, and compared with the traditional tungsten alloy, analysis of the strain and strain rate on the dynamic performance. The results show that although the ultimate tensile strength σb and elongation δ of the fine grain 95W are lower than those of the conventional 95 W, the maximum stress σmax of the fine grain 95 W is higher than that of the conventional tungsten alloy at high strain rate, and the maximum strain εmax is less Decline. At high strain rates, 95 W strain-hardening and thermal softening two competitive effects, at lower strains, strain hardening dominated, the final heat softening sharp decline in stress.