Synergistic precipitation reactions in a novel high-temperature Ti-alloy

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia Pub Date : 2025-01-09 DOI:10.1016/j.scriptamat.2025.116543

Ehsan Farabi , Xinyi He , David Obersteiner , Michael Musi , José Neves , Thomas Klein , Sophie Primig

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Abstract

There is a pressing need for the development of new Ti-alloys tailored to wire-based directed energy deposition (waDED), to enable the wider uptake of this additive manufacturing process by the aerospace and energy industries. Here we present a novel high-temperature Ti-alloy for waDED. Our alloy design aims to exploit phase transformations and precipitation to achieve fine and homogeneous microstructures during processing and to provide improved high-temperature mechanical properties. Our new alloy design features combined additions of Si, Cu, Nb, and Y. We study its microstructural evolution during a simulated waDED solidification route and after various heat-treatments replicating the waDED thermal history in a deposited layer. Our alloy shows significant potential for the formation of fine and equiaxed β grains during waDED. Atom probe and transmission electron microscopy reveal the formation of nm-sized Ti₂Cu, (Ti, Zr)₆Si₃ and sandwich-like Y-Cu dispersoids that are known to improve high-temperature properties in Ti-alloys.

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来源期刊

Scripta Materialia 工程技术-材料科学：综合

CiteScore

11.40

自引率

5.00%

发文量

581

审稿时长

34 days

期刊介绍： Scripta Materialia is a LETTERS journal of Acta Materialia, providing a forum for the rapid publication of short communications on the relationship between the structure and the properties of inorganic materials. The emphasis is on originality rather than incremental research. Short reports on the development of materials with novel or substantially improved properties are also welcomed. Emphasis is on either the functional or mechanical behavior of metals, ceramics and semiconductors at all length scales.