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刘生璞,李德富,贺金宇,郭胜利.25vol%B4Cp/2009Al复合材料热变形本构模型[J].稀有金属材料与工程(英文),2017,46(10):2831~2836.[Liu Shengpu,Li Defu,He Jinyu and Guo Shengli.Constitutive Analysis to Predict High-Temperature Flow Stress of 25vol% B4Cp/2009Al Composite[J].Rare Metal Materials and Engineering,2017,46(10):2831~2836.]
Constitutive Analysis to Predict High-Temperature Flow Stress of 25vol% B4Cp/2009Al Composite
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Received:August 31, 2016  Revised:October 20, 2016
DOI:
Key words: B4Cp/2009Al composite  hot deformation behavior  constitutive equation  flow stress prediction
Foundation item:国家自然科学基金项目(面上项目,重点项目,重大项目)
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Liu Shengpu,Li Defu,He Jinyu and Guo Shengli  
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Abstract:
      Isothermal compression tests of 25vol% B4Cp/2009Al composite have been carried out in the temperature range from 300℃ to 500℃ and the strain rate range from 0.001s-1 to 1s-1. The results show that high-temperature flow stress of the composite decreases with the increase of deformation temperature and the decrease of strain rate. The flow stress has been corrected by friction and the friction corrected stress is lower than experimental values. The influence of friction becomes more obvious with decreasing temperature and increasing strain rate. Then a constitutive equation considering the effect of stain on material constants (i.e. α, n, Q and A) is developed on the basis of Arrhenius type equation. Compared with the experimental results, the flow stress calculated by the constitutive equation possesses a high precision with the correlation coefficient of 0.992. Higher temperature and lower strain rate is beneficial for hot deformation of B4Cp/2009Al composite.
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