Localized pore evolution assisted densification during spark plasma sintering of nanocrystalline W-5wt.%Mo alloy

SCRIPTA MATERIALIA

卷:159

Article

Srivastav, Ajeet K.¹  Chawake, Niraj²  Yadav, Devinder³  Karthiselva, N. S.⁴  Murty, B. S.⁴ 

[1] Visvesvaraya Natl Inst Technol, Dept Met & Mat Engn, Nagpur 440010, Maharashtra, India

[2] Erich Schmid Inst Mat Sci, Jahnstr 12, A-8700 Leoben, Austria

[3] Indian Inst Technol Patna, Dept Met & Mat Engn, Patna 801103, Bihar, India

[4] Indian Inst Technol Madras, Dept Met & Mat Engn, Madras 600036, Tamil Nadu, India

关键词: Nanocrystalline alloys;    Densification;    Kirkendall porosity;    Spark plasma sintering;    Nanoindentation;   

DOI  :  10.1016/j.scriptamat.2018.09.013

来源: Elsevier

【 摘 要 】

The present work reports the role of different atomic mobility induced localized pore evolution on densification during spark plasma sintering of nanocrystalline W-Mo alloy powder. The shrinkage (or expansion) behavior of cold compacted milled powders was studied using dilatometry during non-isothermal sintering up to 1600 degrees C. Subsequently, the milled powders were densified to similar to 95% relative density using spark plasma sintering up to 1600 degrees C. The enhanced localized Joule heating due to dynamically evolved porous structure could be attributed for the densification during spark plasma sintering. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free