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The effect of mechanical alloying time on the microstructural and mechanical properties of spark plasma sintered Ta-10W

机译：机械合金时间对火花等离子体烧结TA-10W微结构和力学性能的影响

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摘要

The effect of mechanical alloying time on the microstructure, hardness and tensile properties of spark plasma sintered (2000 °C, 5 min) Ta-10 (wt%)W alloy were studied. The XRD data's were shown the increase of micro strain and decrease in crystallite size by increasing in mechanical alloying time, before sintering. The unalloyed and heterogeneous microstructure, was more pronounced in blended powders, and the amount of heterogeneity decreased as the milling time increased. The hardness of samples is decreased by increase in mechanical alloying time. Tensile data determined the significant improvement in both strong and elongation by increasing in mechanically alloying time. The fracture mechanism is changed from facet fracture to dimple fracture by increase in mechanically alloying time. It was concluded that the mechanical alloying by means of increase in micro strain and decrease in crystallite size made a sharp decrease on diffusion activation energy, therefor, faster diffusion occurs in eliminated time during spark plasma sintering, preventing formation of carbides. More over faster diffusion made a complete homogeny alloys of refractory metals which are difficult to make a high density with high homogeneity.
机译：研究了机械合金化时间对火花等离子体烧结（2000℃，5分钟）Ta-10（WT％）W合金的微观结构，硬度和拉伸性能的影响。在烧结之前，显示XRD数据的增加和微晶尺寸的微晶尺寸的增加。在混合粉末中更明显和非均相的微观结构，在铣削时间增加时，异质性的量减少。通过机械合金化时间增加，样品的硬度降低。拉伸数据通过机械合金化时间增加来确定强度和伸长率的显着改善。断裂机制通过机械合金时间增加，从平面骨折到凹陷骨折。结论是通过微菌株的增加和微晶尺寸的降低的机械合金化使得在火花等离子体烧结期间消除的时间内发生更快的扩散，防止形成碳化物。更快的扩散更多地制成了难熔金属的完整均质合金，这难以使高密度具有高均匀性。

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