Minor additions of Sn suppress the omega phase formation in beta titanium alloys

Florian Brumbauer*, Norihiko L. Okamoto, Tetsu Ichitsubo, Wolfgang Sprengel, Martin Luckabauer*

*Korrespondierende/r Autor/-in für diese Arbeit

Publikation: Beitrag in einer FachzeitschriftArtikelBegutachtung

Abstract

A critical characteristic of β-Ti alloys is the inevitable formation of ω-precipitates during certain heat treatments which leads to embrittlement, or even to a complete loss of ductility. Therefore, alloy design with the goal to inhibit the elementary ω-formation process is of utmost importance. Here, we propose a design strategy for prototypical β-type Ti–Cr–(Mo) alloys to alleviate this problem using only minor additions of Sn. Upon addition of Sn, we observed an extensive deceleration or even suppression of the ω-formation kinetics during isothermal ageing. Furthermore, the internal friction response of the elementary formation process indicated a decisive reduction of potential ω-nucleation sites, while the activation energy of the process remained almost unchanged. The results show, that the addition of Sn can significantly increase the width of the time–temperature process window and the long-time ageing resistance of β-Ti alloys, opening up huge opportunities for advanced alloy design and manufacturing routes.

Originalspracheenglisch
Aufsatznummer119466
Seitenumfang8
FachzeitschriftActa Materialia
Jahrgang262
Frühes Online-Datum5 Okt. 2023
DOIs
PublikationsstatusVeröffentlicht - 1 Jan. 2024

ASJC Scopus subject areas

  • Metalle und Legierungen
  • Biomaterialien

Fields of Expertise

  • Advanced Materials Science

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