TY - JOUR

T1 - Microstructure and mechanical properties of novel TiAl alloys tailored via phase and precipitate morphology

AU - Wimler, David

AU - Lindemann, Janny

AU - Kremmer, Thomas

AU - Clemens, Helmut

AU - Mayer, Svea

N1 - Publisher Copyright: © 2021 The Author(s)

PY - 2021/11

Y1 - 2021/11

N2 - Research and development of alloys based on the intermetallic γ-TiAl phase is experiencing a renewed interest since powder metallurgical approaches provide new near-net-shape processing options. In this work, the manufacturing via spark plasma sintering was facilitated, a straightforward manufacturing technique to consolidate gas atomized pre-alloyed TiAl powder for microstructural and mechanical evaluation. Two alloys, the so-called BMBF3 alloy (Ti-47.4Al-5.6Nb-0.4W, in at.%) and the BMBF2 alloy (Ti-48.6Al-4.1Nb-0.7W-0.4Si-0.5C-0.1B, in at.%) were microstructurally designed via a heat treatment into a mechanically balanced nearly lamellar γ microstructure, i.e. γ appears in globular and lamellar morphology, as well as a creep resistant fully lamellar one. The latter exhibits high creep strength up to 850 °C, especially due to the formation of p-Ti 3AlC carbides. A heat treatment study upon this fully lamellar microstructure of the C-containing alloy links carbide formation and growth kinetics to the mechanical response of the microstructure. Thus, a stabilization heat treatment at 800 °C leads to the formation of finest carbides which are homogeneously distributed and increase the strength of the microstructure due to lower dislocation mobility. The two investigated alloys can be addressed as either a ductile TiAl alloy employable up to 750 °C (BMBF3), while the BMBF2 alloy is considered useable up to 850 °C.

AB - Research and development of alloys based on the intermetallic γ-TiAl phase is experiencing a renewed interest since powder metallurgical approaches provide new near-net-shape processing options. In this work, the manufacturing via spark plasma sintering was facilitated, a straightforward manufacturing technique to consolidate gas atomized pre-alloyed TiAl powder for microstructural and mechanical evaluation. Two alloys, the so-called BMBF3 alloy (Ti-47.4Al-5.6Nb-0.4W, in at.%) and the BMBF2 alloy (Ti-48.6Al-4.1Nb-0.7W-0.4Si-0.5C-0.1B, in at.%) were microstructurally designed via a heat treatment into a mechanically balanced nearly lamellar γ microstructure, i.e. γ appears in globular and lamellar morphology, as well as a creep resistant fully lamellar one. The latter exhibits high creep strength up to 850 °C, especially due to the formation of p-Ti 3AlC carbides. A heat treatment study upon this fully lamellar microstructure of the C-containing alloy links carbide formation and growth kinetics to the mechanical response of the microstructure. Thus, a stabilization heat treatment at 800 °C leads to the formation of finest carbides which are homogeneously distributed and increase the strength of the microstructure due to lower dislocation mobility. The two investigated alloys can be addressed as either a ductile TiAl alloy employable up to 750 °C (BMBF3), while the BMBF2 alloy is considered useable up to 850 °C.

UR - http://www.scopus.com/inward/record.url?scp=85114027106&partnerID=8YFLogxK

U2 - 10.1016/j.intermet.2021.107316

DO - 10.1016/j.intermet.2021.107316

M3 - Article

VL - 138.2021

JO - Intermetallics

JF - Intermetallics

SN - 0966-9795

IS - November

M1 - 107316

ER -