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首页> 外文会议>Powder Metallurgy World Congress amp; Exhibition(PM 2006); 20060924-28; Busan(KR) >Microstructures of W-Mo-Ni-Fe Heavy Alloys
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Microstructures of W-Mo-Ni-Fe Heavy Alloys

机译：W-Mo-Ni-Fe重合金的显微组织

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摘要

Tungsten heavy alloys with different ratios of Mo and Ni-Fe matrix were liquid-phase-sintered to investigate their microstructural evolution. Specimens were sintered at 1500℃ for 240 minutes and then were either furnace-cooled or water-quenched. The microstructures of the sintered specimens were examined employing SEM. EMPA. DTA, XRD and TEM. Results indicated that increased Mo in the alloy promoted the formation of a (W,Mo)(Ni,Fe) type intermetallic compound in the furnace-cooled condition. It was a monoeutectic reaction when the added Mo content was higher than 49at.%, or a eutectic reaction when this value was between 37at.% to 49at.%. When Mo was added between 25at.% to 37at.%. the precipitation of the intermetallic compound took place by either a eutectoid or peritectoid reaction. No intermetallic compound was found for the Mo adding level being lower than 15at.%. In the water-quenched condition, a lamellar structure with a thickness around 100nm to 200nm was observed in the specimen whose Mo addition was over 27at.%. The lamellar structure was very tiny and uniformly dispersed in the matrix, which could be a reinforcing phase for the matrix phase.
机译：液相烧结不同比例的Mo和Ni-Fe基钨重合金，以研究其微观组织演变。样品在1500℃烧结240分钟，然后进行炉冷或水淬。使用SEM检查烧结样品的微观结构。 EMPA。 DTA，XRD和TEM。结果表明，在炉冷条件下，合金中Mo含量的增加促进了（W，Mo）（Ni，Fe）型金属间化合物的形成。当添加的Mo含量高于49at。％时是单共晶反应，或者当该值在37at。％至49at。％之间时是共晶反应。当添加25at。％至37at。％之间的Mo时。金属间化合物的沉淀是通过共析或共析反应发生的。没有发现金属间化合物的Mo添加量低于15at。％。在水淬条件下，在Mo的添加量超过27at。％的样品中观察到了厚度约为100nm至200nm的层状结构。层状结构非常小并且均匀地分散在基质中，这可能是基质相的增强相。

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