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93W和97W鎢合金破壞機(jī)制研究
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Damage Mechanisms for 93W and 97W Tungsten-Based Alloys
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National Natural Science Foundation of China (60971094)

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    摘要:

    對(duì)粉末冶金法制備的兩種不同鎢含量的鎢合金材料進(jìn)行SHPB試驗(yàn)和原位拉伸試驗(yàn)，研究了鎢合金中鎢含量與其顯微組織、斷裂方式及力學(xué)性能之間的關(guān)系。結(jié)果表明，在拉伸情況下隨著鎢含量的增加，鎢合金的破壞方式由W-W間開裂轉(zhuǎn)變?yōu)殒u顆粒開裂，材料由韌性變?yōu)榇嘈?。利用Ostwald燒結(jié)理論，對(duì)兩種材料的微觀結(jié)構(gòu)進(jìn)行預(yù)測(cè)，結(jié)果與實(shí)驗(yàn)符合較好。利用細(xì)觀力學(xué)模型對(duì)所觀察的實(shí)驗(yàn)結(jié)果進(jìn)行了定量解釋。燒結(jié)理論和細(xì)觀力學(xué)相結(jié)合，可建立材料燒結(jié)條件、體積分?jǐn)?shù)及力學(xué)性能之間的關(guān)系，為材料的設(shè)計(jì)、制備和力學(xué)性能的預(yù)測(cè)提供理論依據(jù)

    Abstract:

    Dynamic compression and in-situ tensile tests were carried out for two kinds of W-Ni-Fe alloys with 93wt% and 97wt% tungsten contents fabricated by P/M technique; their microstructures and damage model were examined and discussed. The damage mechanisms for 93wt% W alloy belongs to ductile separation of W-W interface, and that for 97wt% W alloy belongs to initiation and propagation of microcracks inside tungsten grains. On the base of Ostwald ripening theory for the sintering process, the microstructures of the two kinds of alloys with different tungsten volume fractions under various sintering conditions were predicted, and the results agreed with the tests very well. With the help of Ostwald ripening and micromechanical theory, we set up a relationship for sintering condition, volume fraction of tungsten and mechanical properties to help material design, production and mechanical property prediction

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馬紅磊,胡更開,譚成文,于曉東,白延強(qiáng),劉炳坤,祝 郁.93W和97W鎢合金破壞機(jī)制研究[J].稀有金屬材料與工程,2010,39(8):1344~1347.[Ma Honglei, Hu Gengkai, Tan Chengwen, Yu Xiaodong, Bai Yanqiang, Liu Bingkun, Zhu Yu. Damage Mechanisms for 93W and 97W Tungsten-Based Alloys[J]. Rare Metal Materials and Engineering,2010,39(8):1344~1347.]
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  • 收稿日期:2009-08-22
  • 最后修改日期:2010-07-08
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