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Phase transformation and magnetic properties of Mn54Al46Six

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(1)

HM06

115

-Phase transformation and

magnetic properties of Mn

54

Al

46

Si

x

Hui-Dong Qian1,2*, Ping-Zhan Si1†, Chul-Jin Choi1†, Jihoon Park1, Kyung Mox Cho2 1Powder & Ceramic Division, Korea Institute of Materials Science, Changwon, R. Korea

2School of Materials Science and Engineering Pusan National University, R. KoreaE-mail: cjchoi@kims.re.kr; pzsi@mail.com

The metastable nature of ferromagnetic MnAl usually results in its decomposition during prolonged annealing or high temperature processing. The doping of carbon to MnAl has been proved to be effective in improving the stability of ferromagnetic MnAl. In this work, we systematically studied the effect of silicon doping on the magnetic properties and phase transformation of MnAl. We prepared the Mn54Al46Six alloys by using traditional induction melting method and subsequent optimized annealing processes. It is found that the addition of silicon to MnAl increases the triggering temperature for massive phase transformation of MnAl, while the magnetization of the samples is decreased. Several samples with varied atomic percent of silicon were prepared and analyzed by using XRD, SEM and PPMS.

수치

Fig. 1. Magnetic properties of Mn 54 Al 46 Si 0.5  and Mn 54 Al 46 Si samples after 482℃ heat treatment

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