Enhanced densification of metal powders by transformation-mismatch plasticity

C. Schuh; P. Noël; D. C. Dunand

doi:10.1016/S1359-6454(00)00018-5

Enhanced densification of metal powders by transformation-mismatch plasticity

C. Schuh^*, P. Noël, D. C. Dunand

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

35 Scopus citations

Abstract

The densification of titanium powders is investigated in uniaxial die pressing experiments carried out isothermally at 980°C (in the β-field of titanium) and during thermal cycling between 860 and 980°C (about the α/β 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.% ZrO₂ particles. However, the addition of ZrO₂ hinders densification by dissolving in the titanium matrix during the hot-pressing procedure.

Original language	English (US)
Pages (from-to)	1639-1653
Number of pages	15
Journal	Acta Materialia
Volume	48
Issue number	8
DOIs	https://doi.org/10.1016/S1359-6454(00)00018-5
State	Published - May 11 2000

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Polymers and Plastics
Metals and Alloys

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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 β-field of titanium) and during thermal cycling between 860 and 980°C (about the α/β 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.% ZrO2 particles. However, the addition of ZrO2 hinders densification by dissolving in the titanium matrix during the hot-pressing procedure.",

author = "C. Schuh and P. No{\"e}l and Dunand, {D. C.}",

note = "Funding Information: This research was funded primarily by the US Army Research Office, through Grant DAAH004-95-1-0629, monitored by Dr W. Simmons. C.S. also acknowledges the support of the US Department of Defense through a National Defence Science and Engineering Graduate Fellowship. The experimental involvement of J. P. Agaisse at Matra D{\'e}fense is gratefully recognized. Copyright: Copyright 2017 Elsevier B.V., All rights reserved.",

year = "2000",

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doi = "10.1016/S1359-6454(00)00018-5",

language = "English (US)",

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T1 - Enhanced densification of metal powders by transformation-mismatch plasticity

AU - Schuh, C.

AU - Noël, P.

AU - Dunand, D. C.

N1 - Funding Information: This research was funded primarily by the US Army Research Office, through Grant DAAH004-95-1-0629, monitored by Dr W. Simmons. C.S. also acknowledges the support of the US Department of Defense through a National Defence Science and Engineering Graduate Fellowship. The experimental involvement of J. P. Agaisse at Matra Défense is gratefully recognized. Copyright: Copyright 2017 Elsevier B.V., All rights reserved.

PY - 2000/5/11

Y1 - 2000/5/11

N2 - The densification of titanium powders is investigated in uniaxial die pressing experiments carried out isothermally at 980°C (in the β-field of titanium) and during thermal cycling between 860 and 980°C (about the α/β 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.% ZrO2 particles. However, the addition of ZrO2 hinders densification by dissolving in the titanium matrix during the hot-pressing procedure.

AB - The densification of titanium powders is investigated in uniaxial die pressing experiments carried out isothermally at 980°C (in the β-field of titanium) and during thermal cycling between 860 and 980°C (about the α/β 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.% ZrO2 particles. However, the addition of ZrO2 hinders densification by dissolving in the titanium matrix during the hot-pressing procedure.

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JO - Acta Materialia

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Enhanced densification of metal powders by transformation-mismatch plasticity

Abstract

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