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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。
Using the Gleeble-1500D thermal simulator high temperature isothermal compression test, the rheological behavior of the new reactor neutron absorber-boron carbide-aluminum-silicon composite at strain rate of 0.1 ~ 10s-1 and deformation temperature of 300 ~ 500 ℃ Stress characteristics. The results show that the material has steady rheological characteristics under compressive deformation under the test conditions. The strain rate and deformation temperature strongly influence the flow stress of the test material. The flow stress increases with the increase of strain rate. With the deformation temperature The peak flow stress of the composites was described by the hyperbolic sine function of Zener-Hollomon parameter, and the peak flow stress was obtained. The thermal deformation activation energy was 236.248 kJ / mol.