无压反应烧结过程中Ti-20 wt.% Al混合物中间相形成的机制

Mechanism of the Intermediary Phase Formation in Ti-20 wt. % Al Mixture during Pressureless Reactive Sintering.

作者信息

Školáková Andrea, Salvetr Pavel, Novák Pavel, Leitner Jindřich, Deduytsche Davy

机构信息

Department of Metals and Corrosion Engineering, University of Chemistry and Technology, Technická 5, 166 28 Prague 6, Czech Republic.

Department of Solid State Engineering, University of Chemistry and Technology, Technická 5, 166 28 Prague 6, Czech Republic.

出版信息

Materials (Basel). 2019 Jul 6;12(13):2171. doi: 10.3390/ma12132171.

DOI:10.3390/ma12132171

PMID:31284548

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6651457/

Abstract

This work aims to describe the mechanism of intermediary phases formation in TiAl20 (wt. %) alloy composition during reactive sintering. The reaction between titanium and aluminum powders was studied by in situ diffraction and the results were confirmed by annealing at various temperatures. It was found that the TiAl phase formed preferentially and its formation was detected at 400 °C. So far, this phase has never been found in this alloy composition during reactive sintering processes. Subsequently, the TiAl phase reacted with the titanium, and the formation of the major phase, TiAl, was accompanied by the minor phase, TiAl. Equations of the proposed reactions are presented in this paper and their thermodynamic and kinetic feasibility are supported by Gibbs energies of reaction and reaction enthalpies.

摘要

本工作旨在描述反应烧结过程中TiAl20（重量百分比）合金成分中间相形成的机制。通过原位衍射研究了钛粉和铝粉之间的反应，并通过在不同温度下退火对结果进行了验证。结果发现，TiAl相优先形成，在400℃时检测到其形成。迄今为止，在反应烧结过程中从未在该合金成分中发现过此相。随后，TiAl相与钛发生反应，主要相TiAl的形成伴随着次要相TiAl的形成。本文给出了所提出反应的方程式，其反应的吉布斯自由能和反应焓支持了它们的热力学和动力学可行性。