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

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Title:	Densification and grain growth during isothermal sintering of Mo and mechanically alloyed Mo-TZM
Authors:	MAJUMDAR, S RAVEENDRA, S SAMAJDAR, I BHARGAVA, P SHARMA, IG
Keywords:	diffusion-coefficients crystalline solids molybdenum powders surface diffusion self-diffusion carbon system bcc metals behavior ni boundaries
Issue Date:	2009
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Citation:	ACTA MATERIALIA, 57(14), 4158-4168
Abstract:	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.
URI:	http://dx.doi.org/10.1016/j.actamat.2009.05.013 http://dspace.library.iitb.ac.in/xmlui/handle/10054/10693 http://hdl.handle.net/10054/10693
ISSN:	1359-6454
Appears in Collections:	Article

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