Densification and grain growth during isothermal sintering of Mo and mechanically alloyed Mo-TZM

被引：96

作者：

Majumdar, S. ^{[1
]}

Raveendra, S. ^{[2
]}

Samajdar, I. ^{[2
]}

Bhargava, P. ^{[2
]}

Sharma, I. G. ^{[1
]}

机构：

[1] Bhabha Atom Res Ctr, Mat Proc Div, Bombay 400085, Maharashtra, India

[2] Indian Inst Technol, Dept Met Engn & Mat Sci, Bombay 400076, Maharashtra, India

来源：

ACTA MATERIALIA | 2009年 / 57卷 / 14期

关键词：

Sintering; Diffusion; Grain boundary migration; Refractory metals; Grain growth; DIFFUSION-COEFFICIENTS; CRYSTALLINE SOLIDS; MOLYBDENUM POWDERS; SURFACE DIFFUSION; SELF-DIFFUSION; CARBON SYSTEM; BCC METALS; BEHAVIOR; NI; BOUNDARIES;

D O I：

10.1016/j.actamat.2009.05.013

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Isothermal sintering behavior of pure molybdenum (Mo) and mechanically alloyed Mo-TZM (Mo-0.6Ti-0.2Zr-0.02C) has been investigated in the temperature range 1000-1800 degrees C. A linear relationship has been found to exist between logarithms of increment in density and time. Although the volume diffusion has been found to be the dominant sintering mechanism, a significant contribution from grain boundary diffusion is also identified. Both the diffusion coefficients (D-v) obtained from shrinkage data and the grain boundary mobility (M-b) during grain growth are found to be lower for Mo-TZM due to the presence of carbides in the microstructure. The grain boundary migration is restricted due to the presence of carbides and porosities in the microstructure. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：4158 / 4168

页数：11

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