Temperature and Strain-Rate Dependence of the Flow Stress of AgMg Single Crystals

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Abstract
The effect of temperature and strain rate on the flow stress of β‐AgMg single crystals was investigated in the temperature range of 77° to 900°K and strain‐rate range of 10−4 to 104 sec−1. The low‐temperature data were found to obey the predictions of the Peierls mechanism up to strain rates of 1.8×104 sec−1. Above strain rates of 1.8×104 sec−1 the shear stress becomes athermal and strain‐rate‐sensitive. The high‐temperature data were found to be thermally activated and showed increasing strength with decreasing temperature and increasing strain rate. There is a temperature‐sensitive, strain‐rate‐insensitive region which divides the low‐ and high‐temperature thermally activated mechanisms and shows increasing strength with increasing temperature.