北京科技大学学报2011，Vol.33Issue(4)：455-461,7.
SPS烧结温度对93W-4.9Ni-2.1Fe合金微观结构及性能的影响
Effect of sintering temperature on the microstructures and properties of 93W4. 9Ni-2. 1Fe alloy by spark plasma sintering
摘要
Abstract
A 93W-4.9Ni-2. 1Fe heavy alloy was prepared by spark plasma sintering with 93W-4. 9Ni-2. 1Fe composite powders synthesized by high energy ball milling as raw materials, and the influences of sintering temperature on its microstructure and properties were studied. The fracture morphology and composition of the alloy were measured by scanning electron microscopy and energy dispersive spectrometry, respectively. It is shown that the properties of samples change significantly with sintering temperature, and the tensile strength appears a peak of 981 MPa at 1 350 ℃, where the relative density and the W crystalline grain size arrive at 98. 9％ and 5 μm, respectively. Ni element in samples tends to volatilize when the sintering temperature reaches 1375 ℃, and it is completely volatilized when the sintering temperature hits 1425 ℃. The fracture mode of the alloy sintered from 1250 ℃ to 1 350 ℃ changes from WW cleavage to tungsten-matrix fracture, while it transforms into W-W cleavage again beyond 1 350 ℃. Grain growth can be effectively inhibited by spark plasma sintering, which prompts fine grain strengthening of the alloy.关键词
钨合金/放电等离子烧结/温度/显微组织/力学性能Key words
tungsten alloys/ spark plasma sintering/ temperature/ microstructure/ mechanical properties分类
矿业与冶金引用本文复制引用
刘文胜,徐志刚,马运柱..SPS烧结温度对93W-4.9Ni-2.1Fe合金微观结构及性能的影响[J].北京科技大学学报,2011,33(4):455-461,7.基金项目
国家自然科学基金资助项目(No.50774098) （No.50774098）
