A study on the orientation inheritance in laminated NiAl produced by in situ reaction annealing

Yan Du; Guohua Fan; Lin Geng

doi:10.1016/j.micron.2016.01.006

A study on the orientation inheritance in laminated NiAl produced by in situ reaction annealing

Micron. 2016 Apr:83:42-7. doi: 10.1016/j.micron.2016.01.006. Epub 2016 Jan 29.

Authors

Yan Du¹, Guohua Fan², Lin Geng¹

Affiliations

¹ School of Materials Science and Engineering, Harbin Institute of Technology, No.92 Xidazhi Street, Harbin, Heilongjiang Province 150001, PR China.
² School of Materials Science and Engineering, Harbin Institute of Technology, No.92 Xidazhi Street, Harbin, Heilongjiang Province 150001, PR China. Electronic address: ghfan@hit.edu.cn.

PMID: 26867210
DOI: 10.1016/j.micron.2016.01.006

Abstract

In order to promote the performance of B2 NiAl by texture control of orientation during in situ processing, phase transformation in laminated NiAl with bimodal grain size distribution manufactured by reaction annealing of Ni and Al foils has been studied. It turned out that there existed a Kurdjumov-Sachs orientation relationship (K-S OR) between parent Ni and product NiAl by crystallography analysis according to the electron backscatter diffraction (EBSD) results. The parent Ni did not transform to the product NiAl directly but via the formation of Ni3Al firstly according to the transmission electron microscope (TEM) observation of the interface. This led to a new K-S OR between Ni3Al and NiAl with a small atomic misfit, which made less residual stress generated through the formation of Ni3Al than directly from the parent Ni.

Keywords: EBSD; Laminated NiAl; Orientation relationship; Reaction annealing; Texture inheritance.

Publication types

Research Support, Non-U.S. Gov't