Comparison of densification kinetics of a TiAl powder by spark plasma sintering and hot pressing

被引：49

作者：

Trzaska, Zofia ^{[1
,2
]}

Bonnefont, Guillaume ^{[3
]}

Fantozzi, Gilbert ^{[3
]}

Monchoux, Jean-Philippe ^{[1
,2
]}

机构：

[1] CNRS, CEMES, BP 94347,29 Rue J Marvig, F-31055 Toulouse, France

[2] Univ Toulouse, UPS, F-31055 Toulouse, France

[3] INSA Lyon, MATEIS, 7 Ave J Capelle, F-69621 Villeurbanne, France

来源：

ACTA MATERIALIA | 2017年 / 135卷

关键词：

Spark plasma sintering; Hot pressing; Plasticity; Titanium aluminides; LOW-TEMPERATURE SUPERPLASTICITY; MECHANICAL-PROPERTIES; ELECTRIC-FIELD; ALLOY; MICROSTRUCTURES; BEHAVIOR; CONSOLIDATION; PRESSURE; DIAGRAMS; SYSTEM;

D O I：

10.1016/j.actamat.2017.06.004

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Densification kinetics by spark plasma sintering (SPS) and hot pressing (HP) have been compared, under isothermal conditions and with heating rates of 20 degrees C/min. Careful calibration of sample temperature has been carried out to obtain comparable results. In all cases, densification kinetics did not exhibit significant differences, ruling out any influence of the SPS current. The stress exponent n and the activation energy Q of the Norton law describing deformation at high temperature of the powder particles have been determined by isothermal experiments at different stresses and temperatures, respectively. The values obtained, n = 1.9 +/- 0.3 and Q = 308 +/- 20 kJ/mol for SPS, n = 1.5 +/- 0.3 and Q = 276 +/- 40 kJ/mol for HP, come close in both techniques. Using these values, anisothermal densification kinetics at heating rates of 20 degrees C/min and 100 degrees C/min, typical of the SPS, could be analytically reproduced, using literature models. The activation parameters suggest that SPS densification kinetics occurs by dislocation climb controlled by AI bulk diffusion, that is, by classical metallurgical mechanisms. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：1 / 13

页数：13

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