碳化硼-铝硅复合材料的热压缩流变应力研究

Flow Stress Behavior of Boron Carbide-aluminum Silicon Composite Under Hot Compression Deformation

采用Gleeble-1500D热模拟机高温等温压缩试验,研究了新型反应堆中子吸收材料—碳化硼-铝硅复合材料在应变速率为0.1～10s-1、变形温度为300～500℃条件下的流变应力特征。结果表明:该材料在试验条件下压缩变形时均存在稳态流变特征,应变速率和变形温度强烈影响试验材料流变应力;该流变应力随应变速率的提高而增大,随变形温度的升高而降低;采用Zener-Hollomon参数的双曲正弦函数描述该复合材料高温变形的峰值流变应力,获得峰值流变应力解析式,其热变形激活能为236.248 kJ/mol。

The flow stress behavior of new-type neutron absorber material boron carbide-aluminum silicon composite was studied on Gleeble-1500D simulator. The experimental strain rate is 0.1-10 s^（-1）. The de formation temperature is 300-500 ℃. The results show that the steady-state flow characteristics exist during hot compression deformation of boron carbide-aluminum silicon composite. The deformation temperature and strain rates have significant influences on the flow stress, which can increase with strain rate incresing and decrease with deforming temperature increasing. The peak flow stress of boron carbide-aluminum silicon composite during high temperature deformation can be represented by Zener-Hollomon parameter in hyperbolic. The hot deformation activation energy of boron carbide-aluminum silicon composite during hot deformation is 236.248kJ/mol.