摘要
针对挤压态ZK60镁合金的高温力学性能及其超塑性行为进行了研究.结果表明,挤压态ZK60镁合金的高温力学性能与试验温度、应变速率密切相关.通常,屈服强度和抗拉强度随试验温度的降低和应变速率的增加而提高,而延伸率则随试验温度的升高和应变速率的降低而增大.塑性变形流变应力与温度的倒数之间呈线性关系,而且在应变速率为5×10-4/s下的激活能为93 4kJ/mol.
The superplasticity and high-temperature mechanical properties of as-extruded ZK60 alloys are investigated.The results shows that the high-temperature mechanical properties of as-extruded ZK60 alloys are associated with testing temperature and strain rates.It is evident from the experiments that the 0.2% offset yield strength and ultimate tensile strength of the alloy are increases with decreasing temperature and increasing strain rate.But the elongation to failure increases when the temperature increased and the strain rate decreased.The flowing stress of as-extruded ZK60 alloys during plastic deformation is proportioned to the reciprocal of temperature.At the initial strain-rate of 5×10^(-4)/s,the calculated active energy at 300 ℃ is 93.4 kJ/mol.
出处
《沈阳工业大学学报》
EI
CAS
2004年第3期261-264,共4页
Journal of Shenyang University of Technology
关键词
镁合金
超塑性
高温力学性能
magnesium alloys
superplasticity
high-temperature mechanical properties
