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采用粉末冶金(PM)热等静压(HIP)法以Ta-W-Hf预合金粉末为原料制备了致密块体材料及进行高温处理,测量了材料晶内和晶界处的显微硬度,分析了氧和铪元素的分布状态。结果表明,制备的Ta-W-Hf合金无论退火与否,晶界的硬度均大于晶粒内的硬度。高温退火降低了材料的整体硬度和强度,但仍高于相同成分的熔炼加工材,且韧性与熔炼加工材相当。较高的晶界硬度是由于氧和铪元素的偏聚分布及富氧富铪小粒子的析出所致。
The dense block material was prepared by hot isostatic pressing (HIP) method using Ta-W-Hf pre-alloyed powder by powder metallurgy (PM) and the high temperature treatment was carried out. The microhardness at the grain boundaries and the grain boundaries were measured. The distribution of oxygen and hafnium elements was analyzed. The results show that the hardness of the grain boundary is greater than that of the grain within the prepared Ta-W-Hf alloy, regardless of annealing or not. High-temperature annealing reduces the overall hardness and strength of the material, but is still higher than that of smelting work-pieces of the same composition, with comparable toughness to smelting work-pieces. The higher grain boundary hardness is due to the segregation distribution of oxygen and hafnium and the precipitation of small particles of oxygen-rich hafnium.