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Updated: Jan 15, 2026

A Novel Biaxial Testing Apparatus for the Determination of Forming Limit under Hot Stamping Conditions
Published on: April 4, 2017
Gigapascal yield strength at 900 °C in a boron-free TiAl complex alloy having excellent room temperature formability
S S Nene1, A R Balpande1, A Dutta1
1Advanced Materials Design and Processing Group, Department of Materials Engineering, Indian Institute of Technology Jodhpur, Karwar, Jodhpur, 342037, Rajasthan, India. ssnene@iitj.ac.in.
None:
A newly designed boron-free alloy, Ti50Al45Nb2.5Mo1.25Ta0.5W0.5V0.25 (TiAl-complex alloy (CA), ρ = 4.12 ± 0.015 g cm-3), exhibited a compressive yield strength (YS) of 1.080 ± 0.029 GPa at 900 °C, along with excellent room temperature (RT) strength-formability (YS = 1.107 ± 0.038 GPa, ε = 0.12 ± 2) synergy in the as-cast state. Moreover, the as-cast TiAl CA exhibited controlled mass gain (1.46 ± 0.07 mg cm-2) at 900 °C upon isothermal exposure for 96 hours, displaying excellent oxidation resistance. The improved strength-formability synergy at RT is attributed to a refined γ-L10-dominated three-phase microstructure undergoing twinning and deformation-induced (γ → α2) transformation, in addition to slip-based plasticity. The unusual yet desired β0 phase dissolution (minimal phase fraction) at 900 °C provides exceptionally high YS, whereas the formation of dense Al2O3 + TiO2 layers on the surface results in controlled oxidation. Thus, the similar YS (∼1.1 GPa) of TiAl-CA at RT and 900 °C ensures exceptional microstructural stability in comparison with the pre-existing γ-TiAl and Ni-based superalloys, making it a potential candidate for fuel-efficient aero-engine applications.
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