Synthesis of NiAl intermetallics from cold-extruded samples

被引：8

作者：

Andasmas, Mohamed ^{[1
]}

Chauveau, Thierry ^{[1
]}

Fagnon, Nicolas ^{[1
]}

Vrel, Dominique ^{[1
]}

机构：

[1] Univ Paris 13, Lab Sci Proc & Mat, CNRS, UPR 3407, F-93430 Villetaneuse, France

来源：

INTERMETALLICS | 2013年 / 32卷

关键词：

Nickel aluminides; based on NiAl; Texture; Extrusion; Plastic forming; cold; Reaction synthesis; X-RAY-DIFFRACTION; TITANIUM ALUMINIDES; AL SYSTEM; COMBUSTION; NICKEL; SHS;

D O I：

10.1016/j.intermet.2012.08.019

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In a previous study, we described the phenomenological densification behavior of Ni-Al mixtures, up to a pressure of 100 MPa. The following use of Differential Hydrostatic Extrusion, forcing on the sample non-isotropic plastic deformations allowed a final densification of 98.4% on the stoichiometric mixture. Due to this plastic deformation, the contact area between Ni and Al was improved, with the possible destruction of intermediate oxide layers. Following this idea, the reactivity of these samples was studied under argon at 450 degrees C, 550 degrees C and 800 degrees C. The formation of intermetallics was observed from 450 degrees C by solid state diffusion, while at 550 degrees C, the mechanical activation provided by differential hydrostatic extrusion allowed the sample to undergo Thermal Explosion. Using a low heating rate, this phenomenon could be avoided, and we were able to recover high density NiAl with a strong preferred orientation by a heat treatment at 800 degrees C. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：137 / 144

页数：8

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