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退火溫度對(duì)擠壓態(tài)細(xì)晶鎢合金性能及組織演變的影響
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國(guó)家杰出青年科學(xué)基金 (50925416)；國(guó)家自然科學(xué)基金創(chuàng)新群體項(xiàng)目 (51074187)


Effect of Annealing Temperature on Mechanical Properties and Microstructure Evolution of the as-Extruded Fine-Grain Tungsten Alloy
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    采用稀土微合金化和液相強(qiáng)化燒結(jié)技術(shù)制備細(xì)晶93W-4.9Ni-2.1Fe+0.03%Y合金。研究在快速熱擠壓形變強(qiáng)化后，時(shí)效熱處理對(duì)擠壓態(tài)細(xì)晶93W-4.9Ni-2.1Fe+0.03%Y合金顯微硬度和組織演變的影響，并與相應(yīng)條件的傳統(tǒng)鎢合金進(jìn)行對(duì)比。結(jié)果表明，隨著退火溫度的升高，2種鎢合金鎢相的顯微硬度大大降低。EDS分析表明，隨著退火溫度的升高，鎢合金粘結(jié)相中鎢含量逐漸增加，其中細(xì)晶鎢合金經(jīng)過(guò)1200 ℃退火處理后，粘結(jié)相鎢含量高達(dá)26.11%，而傳統(tǒng)鎢合金在1350 ℃退火處理后含量最高，達(dá)到28.14%。顯微組織觀察表明，退火有利于降低W-W連接度和細(xì)化鎢顆粒；與傳統(tǒng)鎢合金相比，高溫退火后，細(xì)晶鎢合金的粘結(jié)相體積比更高且分布更為均勻

    Abstract:

    Fine-grain 93W-4.9Ni-2.1Fe+0.03%Y alloy was fabricated by microalloying and liquid phase sintering process. The effects of the annealing temperature on the microhardness and microstructure evolution of the fine-grain 93W-4.9Ni-2.1Fe+0.03%Y after rapid hot extrusion were investigated. Meanwhile, conventional tungsten heavy alloy was also fabricated at equivalent condition for comparison. The results show that the microhardness of tungsten phase of the alloys is severely decreased with the annealing temperature increasing. EDS examination reveals that the tungsten content in the matrix of tungsten heavy alloys is gradually enhanced with elevated annealing temperature. The tungsten content in the matrix of fine-grain tungsten heavy alloy has reached a maximum level of the order of 26.11% after annealed at 1200 °C. While, the tungsten content in the matrix of conventional tungsten heavy alloy annealed at the temperature of 1350 °C is 28.14%. Microstructure observation shows that annealing treatment is preferential to the tungsten contiguity reduction and tungsten grain refinement. After high temperature annealing, the matrix is distributed more homogeneously and the volume fraction of the matrix of fine-grain tungsten heavy alloy is higher than that of coarse-grain alloy

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楊昌麟,范景蓮,龔 星,丁 飛,劉 濤.退火溫度對(duì)擠壓態(tài)細(xì)晶鎢合金性能及組織演變的影響[J].稀有金屬材料與工程,2013,42(11):2283~2297.[Yang Changlin, Fan Jinglian, Gong Xing, Ding Fei, Liu Tao. Effect of Annealing Temperature on Mechanical Properties and Microstructure Evolution of the as-Extruded Fine-Grain Tungsten Alloy[J]. Rare Metal Materials and Engineering,2013,42(11):2283~2297.]
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  • 收稿日期:2012-11-25
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