摘要
基于金属力学性质的微观理论,结合合金元素影响镁合金晶粒性质的分析结果,重点研究镁及镁合金晶体在振动变形过程中的阻尼特性机理,通过对阻尼特性机理的理论推导和试验验证,表明:其在宏观屈服前,随应变振幅增大,阻尼机理依次为位错弹性变形时的共振型阻尼、位错脱钉扎(滑移增殖)时、位错线相互纠结钉扎时和滑移带出现时的静滞后型阻尼四个机理阶段;杂质或合金元素的质量分数及分布影响位错源的数量及其平衡状态,进而影响各阶段的阻尼性能并决定各阻尼机理阶段的特征参数值。该研究为设计和制备高阻尼镁合金材料提供了理论基础。
Based on the micro theory of metal mechanical property, combining with the analysis result of the influence of alloy elements on the property of magnesium alloy grain, the mechanism of damping characteristics of magnesium and magnesium alloy in the vibration deformation process is studied. Through theoretical derivation and experimental verification, it is indicated that with the increase of strain amplitude before macroscopic yield, the damping mechanism can be divided into four stages： resonated damping during dislocation elastic deformation, static hysteresis damping during dislocation break loose pinning（slip breeding）, during dislocation line entwisted, and during slip band generated. The quantity of dislocation sources and their equilibrium state are influenced by the content and distribution of impurities or alloy elements, then the damping capacities and characteristic parameters of each stage are also influenced. Through this study, theoretical basis are provided for the design and manufacture of high-damping magnesium alloy.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2009年第9期272-278,共7页
Journal of Mechanical Engineering
基金
重庆市自然科学基金资助项目(2005CC19)
关键词
镁及镁合金
位错
阻尼性能
应变振幅
金属力学
G-L模型
Magnesium and magnesium alloys Dislocation Damping capacity Strain amplitude Metal mechanical G-L model
