用正电子湮没研究永磁合金Mn-Al-C的相变动力学和结构缺陷

用正电子湮没研究永磁合金Mn-Al-C的相变动力学和结构缺陷 INVESTIGATION OF TRANSFORMATION KINETICS AND STRUCTURAL DEFECTS IN FERROMAGNETIC ALLOY Mn-Al-C BY POSITRON ANNIHILATION 王少阶 1 2 first-author 朱光渠 1 2 刘善宜 1 2 武汉大学物理系 武汉大学物理系 武汉冶金研究所 武汉冶金研究所 用正电子湮没技术研究了新型永磁合金Mn-Al-C在500℃、550℃和700℃下的等温退火过程以及温热挤压工艺对其微观结构的影响。测得的正电子寿命随不同温度下等温退火时间的变化揭示出该合金从高温ε相到亚稳铁磁性τ相的相变动力学过程。在挤压样品中的正电子寿命显著增高表明,挤压样品中存在着高密度的结构缺陷,例如位错和晶界。 The isothermal annealing process of ferromagnetic ahoy Mn-Al-C at 500℃, 550℃,700℃ and the effects of extruding on microstructure of the alloy have been investigated by positron lifetime measurements, The transformation kinetics from e phase to r phase was observed by the changes of positron lifetime. In the extruding samples, the positron lifetime became higher which suggested existence of high density structural defects such as dislocation and grain boundaries. 中国科学院科学基金 1985-03-01 2021-04-01 3