纳米颗粒增强金属基复合材料温度相关性屈服强度理论表征模型OA

Through quantitative characterization of the effects of various strengthening mechanisms on the yield strengths of nanoparticle-reinforced metal matrix composites(NRMMCs)within a wide temperature range,as well as the impacts of grain boundary sliding on the yield strength of the metal matrix,a theoretical character-ization model for the temperature-dependent yield strengths of NRMMCs without fitting parameters was estab-lished.This model only requires the yield strength of the metal matrix at any one reference temperature and rel-evant material parameters such as the specific heat capacity,the thermal expansion coefficient,and the melting point,etc.,to predict the yield strengths of the NRMMCs at any temperature.The predicted results of the mod-el are in good agreement with all the 4 sets of experimental data currently available,achieving a reasonable pre-diction of the yield strengths of the NRMMCs within a wide temperature range.On this basis,the effects of the main strengthening mechanisms on the yield strengths of the NRMMCs and their evolution laws with the temper-ature and the particle size were discussed,to provide a theoretical basis and effective suggestions for the design and development of NRMMCs applicable to a wide temperature range.