Abstract
A High Voltage Electron Microscopy (HVEM) examination of quenched and strained alloys of low stacking-fault energy has indicated a high incidence of deformation twins at second phase particles. Deformation twins are produced at NbC particles during quenching of 20/25/Nb steel and following approximately 1% strain in the case of Ni3Al particles in PE-16 alloy. The association of twins and particles in these alloys is a direct result of the development of large stresses at the particle-matrix interface, due to differential contraction rates during quenching. At NbC particles of the order 103 nm diameter, the twinning stress is exceeded on quenching from the solution treatment temperature. In the case of PE-16 alloy the thermal stress set up at the Ni3Al particle is smaller, necessitating a further external applied stress in order to nucleate such twins.
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