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Title: Enhanced densification of metal powders by transformation-mismatch plasticity

Abstract

The densification of titanium powders is investigated in uniaxial die pressing experiments carried out isothermally at 980 C (in the {beta}-field of titanium) and during thermal cycling between 860 and 980 C (about the {alpha}/{beta} phase transformation of titanium). Thermal cycling is found to enhance densification kinetics through the emergence of transformation-mismatch plasticity (the mechanism responsible for transformation superplasticity) as a densification mechanism. The isothermal hot-pressing data compare favorably with existing models of powder densification, and these models are successfully adapted to the case of transformation-mismatch plasticity during thermal cycling. Similar conclusions are reached for the densification of titanium powders containing 1, 5, or 10 vol.% ZrO{sub 2} particles. However, the addition of ZrO{sub 2} hinders densification by dissolving in the titanium matrix during the hot-pressing procedure.

Authors:
; ;
Publication Date:
Research Org.:
Northwestern Univ., Evanston, IL (US)
OSTI Identifier:
20075923
Resource Type:
Journal Article
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 48; Journal Issue: 8; Other Information: PBD: 11 May 2000; Journal ID: ISSN 1359-6454
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CRYSTAL-PHASE TRANSFORMATIONS; HOT PRESSING; TITANIUM; POWDER METALLURGY; TEMPERATURE RANGE 1000-4000 K; THERMAL CYCLING; KINETICS

Citation Formats

Schuh, C., Noel, P., and Dunand, D.C. Enhanced densification of metal powders by transformation-mismatch plasticity. United States: N. p., 2000. Web. doi:10.1016/S1359-6454(00)00018-5.
Schuh, C., Noel, P., & Dunand, D.C. Enhanced densification of metal powders by transformation-mismatch plasticity. United States. doi:10.1016/S1359-6454(00)00018-5.
Schuh, C., Noel, P., and Dunand, D.C. Thu . "Enhanced densification of metal powders by transformation-mismatch plasticity". United States. doi:10.1016/S1359-6454(00)00018-5.
@article{osti_20075923,
title = {Enhanced densification of metal powders by transformation-mismatch plasticity},
author = {Schuh, C. and Noel, P. and Dunand, D.C.},
abstractNote = {The densification of titanium powders is investigated in uniaxial die pressing experiments carried out isothermally at 980 C (in the {beta}-field of titanium) and during thermal cycling between 860 and 980 C (about the {alpha}/{beta} phase transformation of titanium). Thermal cycling is found to enhance densification kinetics through the emergence of transformation-mismatch plasticity (the mechanism responsible for transformation superplasticity) as a densification mechanism. The isothermal hot-pressing data compare favorably with existing models of powder densification, and these models are successfully adapted to the case of transformation-mismatch plasticity during thermal cycling. Similar conclusions are reached for the densification of titanium powders containing 1, 5, or 10 vol.% ZrO{sub 2} particles. However, the addition of ZrO{sub 2} hinders densification by dissolving in the titanium matrix during the hot-pressing procedure.},
doi = {10.1016/S1359-6454(00)00018-5},
journal = {Acta Materialia},
issn = {1359-6454},
number = 8,
volume = 48,
place = {United States},
year = {2000},
month = {5}
}