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機(jī)械合金化和添加微量Y2O3對制備細(xì)晶鎢合金
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國家自然科學(xué)基金項(xiàng)目(50674106)；國家“863”項(xiàng)目(2006AA03A213)


Effect of Mechanical Alloying and Trace Y2O3 Addition on Microstructure of Fine-Grain Tungsten Heavy Alloy Rods
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    采用機(jī)械合金化、添加微量Y2O3和冷等靜壓、液相燒結(jié)工藝制備Ф25 mm的晶粒度為3~4 μm的細(xì)晶93W-4.9Ni-2.1Fe(質(zhì)量分?jǐn)?shù)%, 下同)合金棒材，研究粉末機(jī)械合金化、添加微量Y2O3、燒結(jié)溫度和保溫時(shí)間對合金棒材燒結(jié)致密化和顯微組織的影響。結(jié)果表明：在1480 ℃液相燒結(jié)時(shí)鎢晶粒發(fā)生明顯球化，在此溫度下降低保溫時(shí)間對控制鎢晶粒長大有較大影響，保溫時(shí)間為30 min時(shí)，鎢晶粒尺寸為5~8 μm；保溫時(shí)間為60 min時(shí)，鎢晶粒為8~10 μm。添加微量稀土氧化物Y2O3可以進(jìn)一步有效地抑制晶粒的長大，降低合金的鎢晶粒尺寸和提高組織均勻性，在1480 ℃燒結(jié)60 min時(shí)，鎢晶粒為3~4 μm，而且晶粒尺寸分布更均勻

    Abstract:

    Fine-grained 93W-4.9Ni-2.1Fe tungsten heavy alloy rods with diameter of 25 mm were fabricated by mechanical alloying (MA), trace Y2O3 adding, cold isostatic pressing and sintering. The tungsten grain size of the as-sintered alloy was 3-4 μm. The effects of MA, addition of trace Y2O3 and sintering process on the densification and microstructure of the alloy were studied. It is indicated that the tungsten grains were spheroidized during liquid phase sintering at 1480 oC, and at this temperature the sintering time greatly affects the control of tungsten grains growth. The grain size of the tungsten alloy sintered at 1480 ℃ for 30 min was 5-8 μm. The grain size of the tungsten alloy was 8-10 μm when the sintering time was 60 min at 1480 ℃. The addition of trace Y2O3 further prevents the tungsten grain growth, effectively refining the tungsten grain and inducing a homogeneous microstructure. The tungsten grain size of tungsten alloy sintered at 1480 ℃ for 60 min with addition of Y2O3 was 3-4 μm and more uniform

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劉 濤,范景蓮,黃伯云,祁美貴,田家敏.機(jī)械合金化和添加微量Y2O3對制備細(xì)晶鎢合金[J].稀有金屬材料與工程,2010,39(2):314~317.[Liu Tao, Fan Jinglian, Huang Boyun, Qi Meigui, Tian Jiamin. Effect of Mechanical Alloying and Trace Y2O3 Addition on Microstructure of Fine-Grain Tungsten Heavy Alloy Rods[J]. Rare Metal Materials and Engineering,2010,39(2):314~317.]
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