Yutaka Sato, Yuri Hovanski, and Ravi Verma TMS (The Minerals, Metals & Materials Society), 2011The article of record as published may be located at http://dx.doi.org/10.1002/9781118062302.ch12The evolution of the stir zone microstructure during single-pass and multi-pass 'FSP of an as-cast
NiAl bronze material was evaluated by optical and high-resolution scanning electron microscopy
(SEM) methods, including orientation imaging microscopy (OIM). Deformation commences
ahead of the tool as the local temperature exceeds the eutectoid temperature ("800'C) while
subsequent recrystallization in the primary a is accompanied by dissolution of Kiv particles
dispersed in this constituent. The recrystallized a grains remain equiaxed and appear annealed
despite large displacements onward into the resulting stir zone (SZ). Characteristic shear texture
components are retained in the thermomechanically affected zone (TMAZ) but the texture of the
primary a becomes random after recrystallization and remains so into both single-pass and multipass
SZs. Mechanisms to account for recrystallization and subsequent deformation are proposed.Office of Naval ResearchNOOO I 409WR2020
