摘要
采用Ｈｏｐｋｉｎｓｏｎ杆加载技术和帽状试样，研究Ｍｏｎｅｌ合金在εｓ≈４．３×１０５ｓ－１的高应变速率条件下的应力－应变关系及塑性变形行为．实验及计算结果表明，塑性区（简称剪切带）内温度随剪切应变增加呈线性升高．透射电镜证实剪切带组织发生了动态再结晶，再结晶晶粒约为１７０ｎｍ．分析了剪切带中组织结构的演变过程。
The plastic deformation behavior and stress-strain response
characteristics of Monel alloy at high strain rate ( s≈4.3×10 5s -1 ) are studied using
Hopkinson bar and hat-shaped specimen. The temperature arising from the adiabatic heating
within the shear band is calculated and increases almost linearly with plastic shear strain. The
small recrystallized grains (170 nm in diameter) within the centre of the shear band and the
elongated cell structures in the transition zone between the center of the shear band and matrix
are observed by TEM. It is suggested that the microstructure evolution during plastic
deformation are as follows: first, large amount of dislocations are produced and
inhomogenously distributed in the band; second,elongated/equiaxed cells are formed, then
small nulei are appeared and their growth rate is controlled by the strain rate; finally cracking
occurs along the shear band.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1999年第1期49-52,共4页
Acta Metallurgica Sinica
基金
国家自然科学基金
辽宁省博士启动基金
