【摘 要】
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The phase equilibria of the Nb-Si-W ternary system have been studied for the Si-rich portion by investigating the as-cast+heat-treated ternary alloys.The mi
【出 处】
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第十六届全国相图学术会议暨相图与材料设计国际研讨会
论文部分内容阅读
The phase equilibria of the Nb-Si-W ternary system have been studied for the Si-rich portion by investigating the as-cast+heat-treated ternary alloys.The microstructure observation,the phase identification and the composition measurement were performed using scanning electron microscopy (SEM),X-ray diffraction (XRD) and electron probe microanalysis (EPMA),respectively.Partial isothermal section of the Nb-Si-W ternary system with 0.4 < x(Si)< 1 at 1873K has been constructed.No ternary compound was found at this isothermal section.There are two three-phase regions,Diamond-Si+Nb(W)Si2+W(Nb)Si2 and Nb(W)Si2+W(Nb)Si2+β(Nb,W)5Si3,two two-phase regions,Diamond-Si+Nb(W)Si2 and Nb(W)Si2+β(Nb,W)5Si3.
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