Transient liquid phase sintering in spark plasma sintered tungsten heavy alloys with Nb and Mo additives

被引：4

作者：

Singh, Indeevar ^{[1
]}

Dabhade, Vikram V. ^{[1
]}

机构：

[1] Indian Inst Technol Roorkee, Dept Met & Mat Engn, Roorkee 247667, Uttaranchal, India

来源：

INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS | 2024年 / 124卷

关键词：

Tungsten heavy alloys; Spark plasma sintering; Transient liquid phase; Niobium; Molybdenum; MECHANICAL-PROPERTIES; MICROSTRUCTURE; TEMPERATURE; EVOLUTION;

D O I：

10.1016/j.ijrmhm.2024.106849

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In the present investigation spark plasma sintered tungsten heavy alloys of composition 90W-7Ni-3Fe, 84W-7Ni3Fe-6Mo, and 84W-7Ni-3Fe-6Nb were analyzed to determine the effect of Mo and Nb addition on microstructure and phase formation. The alloys were sintered at temperatures ranging from 1150 degrees C to 1275 degrees C and at a fixed sintering pressure of 30 MPa. Nb added alloy exhibited a maximum relative density of 99% at sintering temperature of 1200 degrees C. Whereas the base alloy and Mo added alloy, exhibited a maximum relative density of 97.9% and 95.9% at 1150 degrees C respectively. Transient liquid phase sintering was found to play a crucial role in the base alloy and Mo added alloy whereas the Nb added alloy was found to undergo persistent liquid phase sintering. Microstructure characterisation by SEM revealed formation of finer tungsten grains with average grain size ranging from 1 mu m to 4.3 mu m. Mo addition restricted the tungsten grain growth while Nb addition promoted the tungsten grain growth compared to the base alloy. Phase analysis by XRD revealed the formation of Ni4W intermetallic (at lower temperatures) for the base alloy, NbO2 and Nb-W intermetallics for Nb added alloy and Mo-Ni rich phase for Mo added alloys. Hardness measured by Vickers hardness method revealed a declining trend in hardness with increase in sintering temperature, owing to tungsten grain growth in all the alloys and along with Kirkendall pore formation and growth for the base alloy and Mo added alloy. Nb addition resulted in maximum hardness of 678 HV1 which is highest ever reported for SPSd WHA with 90 wt% concentration of W.

引用

页数：14

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