TY - JOUR

T1 - In Situ Investigation of the Rapid Solidification Behavior of Intermetallic γ-TiAl-Based Alloys Using High-Energy X-Ray Diffraction

AU - Graf, Gloria

AU - Rosigkeit, Jan

AU - Krohmer, Erwin

AU - Staron, Peter

AU - Krenn, Raimund

AU - Clemens, Helmut

AU - Spörk-Erdely, Petra

N1 - Publisher Copyright: © 2021 The Authors. Advanced Engineering Materials published by Wiley-VCH GmbH.

PY - 2021/6/23

Y1 - 2021/6/23

N2 - Representing an attractive new processing method, additive manufacturing can be used to manufacture parts made of γ-TiAl-based alloys for high-temperature applications. However, in terms of nucleation during rapid solidification and subsequent solid-state phase transformations, the process is not yet fully understood, and research is still going on. This article focuses on a setup to study solidification processes during laser melting via in situ high-energy X-ray diffraction at a synchrotron radiation source. To create conditions similar to those encountered in powder bed-based additive manufacturing processes, such as electron beam melting or selective laser melting, a thin platelet is laser-melted on its upper edge. Phase transitions are measured simultaneously via high-energy X-ray diffraction in transmission geometry. The use of a thin platelet instead of the usual powder bed precludes the unfavorable contribution of solid phases from surrounding powder particles to the diffraction signal. First results of the in situ high-energy X-ray diffraction experiment on a Ti–48Al–2Nb–2Cr (in at%) alloy prove the applicability of the used setup for an accurate tracing of phase transformations upon rapid solidification.

AB - Representing an attractive new processing method, additive manufacturing can be used to manufacture parts made of γ-TiAl-based alloys for high-temperature applications. However, in terms of nucleation during rapid solidification and subsequent solid-state phase transformations, the process is not yet fully understood, and research is still going on. This article focuses on a setup to study solidification processes during laser melting via in situ high-energy X-ray diffraction at a synchrotron radiation source. To create conditions similar to those encountered in powder bed-based additive manufacturing processes, such as electron beam melting or selective laser melting, a thin platelet is laser-melted on its upper edge. Phase transitions are measured simultaneously via high-energy X-ray diffraction in transmission geometry. The use of a thin platelet instead of the usual powder bed precludes the unfavorable contribution of solid phases from surrounding powder particles to the diffraction signal. First results of the in situ high-energy X-ray diffraction experiment on a Ti–48Al–2Nb–2Cr (in at%) alloy prove the applicability of the used setup for an accurate tracing of phase transformations upon rapid solidification.

UR - http://www.scopus.com/inward/record.url?scp=85109075075&partnerID=8YFLogxK

U2 - 10.1002/adem.202100557

DO - 10.1002/adem.202100557

M3 - Article

VL - 23.2021

JO - Advanced engineering materials

JF - Advanced engineering materials

SN - 1438-1656

IS - 11

M1 - 2100557

ER -