Abstract
Abstract The instability of antiphase boundaries (APB's) on {111} is one possible explanation for the abnormal negative temperature dependence of yield strength (TOYS) in Fe3Ge but APB tubes are found in deformed Fe3Ge which suggests that APB{111}'s are not unstable. Actual measurement of the APB energy on {111} again indicates that APB {111}'s should be unstable and the APB{111}'s in the APB tubes are thought to be stabilized by the small APB widths and their end conditions. Thus an explanation of the abnormal negative temperature dependence of yield strength in terms of unstable {111} APB's still appears to be valid.
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