A study of fracture behaviour of gamma lamella using the notched TiAl micro-cantilever

Ding, Rengen; Chiu, Yulung; Chu, Mingqiang; Paddea, Sanjooram and Su, Guanqiao (2020). A study of fracture behaviour of gamma lamella using the notched TiAl micro-cantilever. Philosophical Magazine. Part A: Materials Science, 100(8) pp. 982–997.

DOI: https://doi.org/10.1080/14786435.2020.1714088

Abstract

Microcantilevers were machined from a single $\gamma(TiAl)-\alpha_2(Ti_3Al)$ lamellae colony of a polycrystalline commercial Ti-45Al-2Mn-2Nb sample using the focussed ion beam. The long axis of the microcantilevers is perpendicular to the lamellar interface with the notch prepared in the same γ lamella. Bending test results demonstrated good repeatability and the fracture stress intensity factor of individual γ lamella was measured to be $3.1 \pm 0.2 MPa\ m^{1/2}$. $(\overline{1}\overline{1}1)[\overline{1}\overline{1}\overline{2}]$ twinning ahead of the notch (crack) tip plays a key role in the crack initiation. TEM analysis shows that the interaction of twinning with the lamellar interface leads to interfacial cracking and contributes to the work-hardening observed.

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