Abstract
It is well known that twinning likely nucleates and forms pairs at grain boundaries (GBs) during the formation of hexagonal close-packed alloys. Therefore, the crystallography of GBs should be taken into account to assess the activation preference of twins (and pairs) at GBs. As Schmid factor (SF) is a grain-based parameter, it cannot predict from which GB segment, twinning prefers to nucleate. To solve this problem, recently we proposed a composite Schmid factor (CSF) that incorporates both the SF and a geometric compatibility factor (m’) between twin/slip systems in neighbouring grains. In this presentation, we first summarize the definition and calculation method of this parameter. Then, simultaneous twin nucleation and twin (or slip) stimulated twin behaviour in a twin chain were assessed by this parameter. For comparison, SF and m’ analyses were also performed. The advantages and limitations of this CSF in assessing twin behaviours were discussed.
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