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首页> 外文期刊>Materials at High Temperatures >Evolution of the microstructure in a W alloy during sintering before the formation of a liquid phase
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Evolution of the microstructure in a W alloy during sintering before the formation of a liquid phase

机译:W合金在液相形成之前的烧结过程中微观组织的演变

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Partial densification in W-based alloysintering occurs before liquid phase formation by solidphase diffusion. During this step W diffuses in thesecond phase and tungsten grains connect between themto constitute a skeleton. A dilatometric study permitsto follow the shrinkage during heating. The secondphase, a Ni-based alloy NiFeCo, forms with tungsten aNiFeCoW alloy. The structure is that of nickel and thelattice parameter increases with increasing W content.Sintering tests are made from 5000C to 1,400℃ to knowthe solid phase range of W during liquid phase sintering.Limits of W% are determined until 1 ,4000C and are usedto define the diffusion temperature range. Theobservation of fracture surfaces gives the evolutionof the microstructure during the sintering and can becorrelated to diffusion results.
机译:W基合金烧结中的部分致密化发生在通过固相扩散形成液相之前。在该步骤期间,W在第二相中扩散并且钨晶粒在它们之间连接以构成骨架。膨胀计研究允许跟踪加热过程中的收缩。第二相是镍基合金NiFeCo,由钨aNiFeCoW合金形成。其结构为镍,晶格参数随W含量的增加而增加。在5000C至1,400℃的温度范围内进行烧结试验,以了解液相烧结过程中W的固相范围。确定W%的限量直至1,4000C并用于定义扩散温度范围。断裂表面的观察给出了烧结过程中微观结构的演变,并且可能与扩散结果有关。

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