Abstract
In this investigation, an asymmetrical yield criterion is proposed, and applies it to a hardness model which considers the interaction between statistically stored dislocations (SSDs) and geometrically necessary dislocations (GNDs). Based on this modified model, the relationship between pre-compression strain and hardness is analyzed by nanoindentation tests. In order to obtain the yield behavior of the CoCrFeNiMn high entropy alloy (HEA), the combined loading and uniaxial loading tests are conducted. Then different compression plastic strain is applied to specimens under various levels of temperature to investigate the interaction between SSDs and GNDs of CoCrFeNiMn HEA. Finally, the result shows that the effect of pre-compression depends on the competition between the pre-compression induced dislocations and nanoindentation nucleated dislocations because pre-compression causes the change of grain size.
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