Investigation of Phase Transformations and Ordering Mechanisms in a Pd–Cu–Ag–Ru Alloy

Author:

Lumper Lea Andrea1ORCID,Fecher Jonas2,Stark Andreas3ORCID,Maier‐Kiener Verena1ORCID

Affiliation:

1. Department of Materials Science Montanuniversität Leoben Franz Josef Strasse 18 Leoben 8700 Austria

2. Heraeus Precious Metals GmbH & Co. KG Heraeusstraße 12‐14 Hanau 63450 Deutschland Germany

3. Helmholz‐Zentrum Hereon Max‐Planck‐Straße 1 Geesthacht 21502 Deutschland Germany

Abstract

An in‐depth analysis of phase transformations in a Pd–Cu–Ag alloy, crucial for applications in hydrogen membranes and electrical components, is presented. The investigation emphasizes the influence of the deformation rate and addition of Ag on the formation of the ordered CuPd phase. This study focuses on a specific alloy composition, 49.1% Cu–41.3% Pd–8.3% Ag–1.3% Ru, investigating its behavior under various conditions. Through comprehensive analysis, including the influence of the initial state, deformation variations, and chemical composition modifications, high‐energy X‐ray diffraction to unveil detailed phase evolution dynamics is used. Surprisingly, experimental findings deviate from the anticipated phase diagram, uncovering a previously unrecognized three‐phase region with the formation of AgPd. Notably, the study reveals the pivotal role of the alloy's Ag content in the development of ordered CuPd and AgPd phases. The addition of Ru exhibits no involvement in the observed phase transformations, contributing to the understanding of the alloy's composition‐dependent behavior. This research provides valuable insights into the intricate interplay of factors influencing phase transformations, offering a nuanced perspective beyond theoretical predictions. The newfound understanding of Ag's role and Ru's inertness refines material design considerations, enhancing the grasp of the alloy's thermodynamic stability under varying conditions.

Publisher

Wiley

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