摘要
采用压缩实验法在Gleeble -15 0 0热模拟实验机上测定了HAl64 5 4 2复杂黄铜合金在恒定温度和恒定速度下的变形抗力。研究结果表明 :HAl64 5 4 2合金热变形的流变应力随温度的升高和应变速率的降低而减小 ;在较低的变形速率下 ,应力 应变曲线较平滑未显示出明显的屈服点 ,而在较高的变形速率下应力 应变曲线不仅显示出明显的屈服应力 ,而且在屈服应力点处有突然的下降。以经典的双曲正弦形式的模型为基础建立了HAl64 5 4 2合金热变形的本构方程 ,同时也通过对数据回归处理确定了合金不同温度下的应力指数n、变形激活能Q、材料常数lnA以及α。
The flow stress of HAl64-5-4-2 special brass is measured by upset tests of cylindrical samples in the Gleeble-1500 heat stimulation machine. The results show that the true stress of hot deformation of special brass increases with the decrease of the deformational temperature and the increase of the strain rate. At lower strain rates, there are no apparent yielding points in the curve of stress-strain, but at higher strain rates there are apparent yielding points and there is sudden falling at yielding points in the curve of true stress-strain. The constitutive equation for hot deformation of special brass is obtained on the basis of hyperbolic sine form model, and the material constants, including activation energy Q, stress exponent n and lnA, α, β are also obtained.
出处
《矿冶工程》
CAS
CSCD
北大核心
2004年第6期63-66,共4页
Mining and Metallurgical Engineering
基金
国家计委 2 0 0 2年高技术产业化新材料专项项目资助 (计高技 [2 0 0 2 ] 4 2 3号 )
