Quantitative Assessment Of Strain And Heat
Treatment On Twin Formation In Commercially
Pure Nickel
Author(s)
Q. Li, J. R. Cahoon & N. L. Richards
Abstract
Thermomechanical treatment comprising cold working to 6% strain followed by
annealing at temperatures in the range 700 oC to 1000 oC greatly increases the
fraction of special boundaries, primarily Σ3 type. The accompanying generation
of annealing twins is analysed using the accident growth model due to Gleiter
and the phenomenological model of Pande et al. It is shown that Gleiter’s model,
which contains no scaling factors, when used correctly, predicts the twin density
in Cu alloys and pure nickel. The model due to Pande et al also predicts the twin
density in Ni but this model incorporates two scaling factors that detract from its
generality.
Keywords: special grain boundaries, annealing twins, copper alloys, nickel.
1 Introduction
It has been long accepted that thermomechanical treatments can alter the size,
shape and crystallographic orientation of grains. In 1984, Watanabe [1] proposed
that the type of grain boundaries present could also be controlled sand thus the
concept of \“grain boundary engineering” was initiated. Grain boundary
engineering has been used to increase the fraction of \“special grain boundaries”,
usually defined in terms of coincidence lattice site (CSL) boundaries. A high
fraction of low Σ CSL boundaries {Σ (≤ 29)} has been shown to improve
resistance to intergranular crack propagation in Inconel 600 [2, 3] and to
substantially improve the elevated temperature crack growth resistance of a
nickel-based superalloy [4]. For type 304 stainless steel and alloy 600, high
Keywords
special grain boundaries, annealing twins, copper alloys, nickel.
Related Book
Other papers in this volume
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