科研之友
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摘要
The temperature for phase transformation of epsilon -> tau in Mn54Al46Cx (hereafter denoted by MnAlCx, x = 0-5) alloys was systematically studied by using the traditional thermal analysis method and a more precise magnetic measurement method developed in this work. The effect of carbon content and cold-rolling on the magnetic properties of the MnAlCx alloys was studied. The onset temperature of massive growth of tau- from epsilon-phase increases with increasing carbon content in MnAlCx. The carbon content has little effect on the onset temperature of displacive growth of epsilon -> tau but has substantial effect on the displacive growth rate at certain temperature. Pure tau-MnAlCx with varied x was obtained by annealing the epsilon-phase at optimum temperatures determined by our method. The Curie temperature of the MnAlCx decreases significantly first and then increases slightly with increasing carbon content. The coercivity and the remanent magnetization of the as-prepared tau-MnAlCx increase with increasing x first and become stable at x > 3 and x > 4, respectively. A cold-rolling method was introduced in this work to enhance the magnetic properties of tau-MnAlCx. The coercivity and remanent magnetization of the tau-MnAl after cold-rolling were enhanced up to 4.3 times and 3.3 times, respectively. The coercivity of the cold-rolled tau-MnAlCx decreases with increasing x and becomes stable when x > 2. The remanent magnetization and saturation magnetization of the cold-rolled tau-MnAlCx vary little with x.
- 出版日期2018-4-1
- 单位中国计量大学
