On account of the integral behavior of dislocations and the interaction between solute atoms and dislocations, a model describing the serrated yielding (i.e. the PL effect) in substitutional alloys is proposed. Accord...On account of the integral behavior of dislocations and the interaction between solute atoms and dislocations, a model describing the serrated yielding (i.e. the PL effect) in substitutional alloys is proposed. According to this model, the serrated yielding occurring in a certain strain rate-temperature range will disappear when the strain exceeds a proper value under certain conditions. The model has been confirmed by tensile tests and rapid changing strain rate tests on a commercial Cu-32wt.％ Zn alloy. Experimental results agree well with the predicted effects of temperature and strain rate on the critical strain for the appearance and disappearance of serrations.展开更多
基金Project supported by the National Natural Science Foundation of China and the Natural Science Fund of Fujian, China.
文摘On account of the integral behavior of dislocations and the interaction between solute atoms and dislocations, a model describing the serrated yielding (i.e. the PL effect) in substitutional alloys is proposed. According to this model, the serrated yielding occurring in a certain strain rate-temperature range will disappear when the strain exceeds a proper value under certain conditions. The model has been confirmed by tensile tests and rapid changing strain rate tests on a commercial Cu-32wt.％ Zn alloy. Experimental results agree well with the predicted effects of temperature and strain rate on the critical strain for the appearance and disappearance of serrations.
