Analyzing the Precipitation Effects in Low-Alloyed Copper Alloys Containing Hafnium and Chromium

Dölling J, Kuglstatter M, Prahl U, Höppel HW, Ortner P, Ott B, Kracun SF, Fehlbier M, Zilly A (2024)

Publication Type: Journal article

Publication year: 2024

Journal

Metals MDPI

Book Volume: 14

Pages Range: 258

Issue: 3

DOI: 10.3390/met14030258

Abstract

Copper alloys containing chromium and hafnium combine elevated mechanical strength and high electrical and thermal conductivity. For the simultaneous enhancement of both material properties, precipitation hardening is the utilized mechanism. Therefore, the aim is to analyze the influence of chromium and hafnium in binary and ternary low-alloyed copper alloys and to compare the precipitation processes during temperature exposure. Atom probe tomography (APT) and differential scanning calorimetry (DSC) measurements enable to understand the precipitation sequence in detail. CuCr0.7 starts to precipitate directly, whereas CuHf0.7 is highly influenced by prior diffusion facilitating cold rolling. Within the ternary alloy, hafnium atoms accumulate at the shell of mainly Cr-containing precipitates. Increasing the local hafnium concentration results in the formation of intermetallic CuHf precipitates at the sites of mainly Cr-containing precipitates. Indirect methods are utilized to investigate the materials’ properties and show the impact of cold rolling prior to an aging treatment on binary alloys CuCr and CuHf. Finally, ternary alloys combine the benefits of facilitated precipitation processes and decelerated growing and coarsening, which classifies the alloys to be applicable for usage at elevated temperatures.

Authors with CRIS profile

Moritz Kuglstatter Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Heinz Werner Höppel Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Patrick Ortner Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Benedict Ott Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Additional Organisation(s)

Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Involved external institutions

Universität Kassel DE Germany (DE) Duale Hochschule Baden-Württemberg (DHBW) DE Germany (DE) Technische Universität Bergakademie Freiberg DE Germany (DE)

How to cite

APA:

Dölling, J., Kuglstatter, M., Prahl, U., Höppel, H.W., Ortner, P., Ott, B.,... Zilly, A. (2024). Analyzing the Precipitation Effects in Low-Alloyed Copper Alloys Containing Hafnium and Chromium. Metals, 14, 258. https://doi.org/10.3390/met14030258

MLA:

Dölling, Julia, et al. "Analyzing the Precipitation Effects in Low-Alloyed Copper Alloys Containing Hafnium and Chromium." Metals 14 (2024): 258.

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