Kinetics of elastic twinning in calcite
1962 ◽
Vol 270
(1343)
◽
pp. 525-537
◽
Keyword(s):
An investigation of the effect of localized transient stresses on calcite is described. It is shown that twinning may or may not occur, depending on the duration of the stress pulse, the temperature and a factor related to the length of twin which may be formed. An hypothesis is suggested to explain the results and, from it, the velocity of propagation of twin lamellae is calculated in the temperature range from 20 to 300 °C. An activation energy for twin propagation is also calculated. Direct observation of the twinning process using a high-speed camera has confirmed the above hypothesis and results and has shown that the velocity of propagation of twin lamellae in calcite is not very dependent on the applied shear stress.