Abstract
The flow stress anomaly in some L1 2 alloys is a well-documented phenomenon. There are, however, other L1 2 alloys which show a large and negative temperature dependence of yield strength (TDYS). The present work attempts to answer the question of why materials with the same L1 2 structure can exhibit different TDYS by investigating the L1 2 compound Fe 3Ge. Transmission electron microscopy studies show that 〈110rrang;{001} are the easiest slip systems in Fe 3Ge. The high Peierls stress can readily explain the large and negative TDYS. The absence of the more usual octahedral slip systems is thought to be due to the instability of APBs on {111} planes.
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