Determining the liquidus and ordering temperatures of the ternary Ni-Mn-Ga and quaternary Ni-Mn-Ga-Fe / Cu alloys
Determining the liquidus and ordering temperatures of the ternary Ni-Mn-Ga and quaternary Ni-Mn-Ga-Fe / Cu alloys
复制标题
确定三元 Ni-Mn-Ga 和四元 Ni-Mn-Ga-Fe / Cu 合金的液相线和有序温度
DOI：
--
复制
发表时间：
2009
期刊：
影响因子：
--
通讯作者：
S. Hannula
中科院分区：
文献类型：
--
作者：
I. Aaltio;M. Friman;I. Glavatskyy;Y. Ge;N. Glavatska;S. Hannula
研究了Ni47.7Mn31.2Ga21.1、Ni49.7Mn28.7Ga21.6、Ni49.6Mn24.0Ga26.6、Ni47.3Mn30.3Ga20.3Fe2.1、Ni49.9Mn28.3Ga20.1Fe1.7、Ni51.3Mn14.4Ga26.3Fe8.0、Ni47.3Mn25.5Ga24.5Cu2.7、Ni48.3Mn29.7Ga21.1Cu0.9、Ni49.4Mn23.3Ga25.6Cu1.7等合金的高温相变（如液相、有序温度）。首先测定了合金的化学成分（SEM-EDS）、马氏体温度和磁转变温度（DSC，交流磁化率）。在10k /min氩气中进行高温DSC测量。在固态（301 1273 K）下进行了第一次两次测量，在第三次测量中，材料被熔化（最大平均值）。温度：1573 K)。在固体状态下的测量得到了有序温度。当e/a比值大于7.53时，定序温度在1019 ~ 1039 K范围内，否则变化明显。在少量季元加入的情况下，加热和冷却的差异小于5 K，但8% Fe合金化使这一差异增加到18 K。Ni/Mn/ ga比相近的合金在固相温度和液相温度上只有微小的差异，但如果Ni/Mn比有明显的变化，即使e/a比相近的合金在熔化行为上也有明显的差异。当Ni/Mn为1.5时，较高的数值无法确定清晰区域。
The high temperature transformations (e.g. liquidus, ordering temperature) of the alloys Ni47.7Mn31.2Ga21.1, Ni49.7Mn28.7Ga21.6, and Ni49.6Mn24.0Ga26.6, Ni47.3Mn30.3Ga20.3Fe2.1, Ni49.9Mn28.3Ga20.1Fe1.7, Ni51.3Mn14.4Ga26.3Fe8.0, Ni47.3Mn25.5Ga24.5Cu2.7, Ni48.3Mn29.7Ga21.1Cu0.9, and Ni49.4Mn23.3Ga25.6Cu1.7 were studied for the practical melting and annealing purposes. At first the chemical compositions (SEM-EDS) and the martensitic and magnetic transition temperatures (DSC, ac magnetic susceptibility) of the alloys were determined. High temperature DSC measurements were made in argon with 10 K/min. Two first measurements were carried out in the solid state (301 1273 K) and in the third measurement the material was melted (max meas. temp. 1573 K). The ordering temperature was obtained from the measurements in the solid state. As the e/a ratio was above 7.53 the ordering temperature was in the range of 1019-1039 K, otherwise a clear change was observed. The variation in heating and cooling was less than 5 K with small quaternary additions, but alloying of 8% Fe increased this difference to 18 K. Alloys with close Ni/Mn/Ga-ratio showed only minor differences in solidus and liquidus temperatures, but if there was a clear change in the Ni/Mn-ratio even those alloys having close e/a ratios showed a clear difference in melting behavior. When Ni/Mn is 1.5with higher values not clear region could be determined.