Cu、Ga和C掺杂对MnAl合金相结构及磁性能的影响
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摘要
研究Cu、Ga、C元素掺杂的MnAl合金的相结构和磁性能。结果表明:在Cu或者Ga掺杂的MnAl合金中加入C元素,有助于磁性相τ-MnAl的形成。Mn_(50)Al_(47)Ga_3C_3粉末的饱和磁化强度(M_s)随着球磨时间的增加而减小,矫顽力(H_c)随着球磨时间的增加先增大后减小。球磨前Mn_(50)Al_(47)Ga_3C_3合金(1000℃×20 h)样品的饱和磁化强度为89.98 Am~2/kg,约为其理论饱和磁化强度值144 Am~2/kg的62.5%;获得最好磁性能是在粉末球磨1h后,Ms=51.91Am~2/kg,Hc=155.2 kA/m。
The phase structure and magnetic properties of MnAl alloys doped with Cu, Ga and C elements were investigated. The results show that the carbon addition promotes the formation of the τ-MnAl phase in MnAl alloys doped with Cu or Ga. The saturation magnetization(M_s) of Mn_(50)Al_(47)Ga_3C_3 powders decreases with the increase of the milling time,and the coercivity(H_c) firstly increases and then decreases with the increase of milling time. Msfor Mn_(50)Al_(47)Ga_3C_3 bulk speciment(1000 ℃×20 h heat treatment) before milling is 89.98 Am~2/kg, which is about 62.5% of its theoretical Msvalue(144 Am~2/kg). and then the optimal magnetic properties, such as Ms=51.91 Am~2/kg, Hc=155.2 kA/m, can be obtained from the powders ball milling for 1 h.
The phase structure and magnetic properties of MnAl alloys doped with Cu, Ga and C elements were investigated. The results show that the carbon addition promotes the formation of the τ-MnAl phase in MnAl alloys doped with Cu or Ga. The saturation magnetization(M_s) of Mn_(50)Al_(47)Ga_3C_3 powders decreases with the increase of the milling time,and the coercivity(H_c) firstly increases and then decreases with the increase of milling time. Msfor Mn_(50)Al_(47)Ga_3C_3 bulk speciment(1000 ℃×20 h heat treatment) before milling is 89.98 Am~2/kg, which is about 62.5% of its theoretical Msvalue(144 Am~2/kg). and then the optimal magnetic properties, such as Ms=51.91 Am~2/kg, Hc=155.2 kA/m, can be obtained from the powders ball milling for 1 h.
引文
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[3]Bittner F,Schultz L,Woodcock G.Twin-like defects in L10,orderedτ-MnAl-C studied by EBSD[J].Acta Materialia,2015,101:48-54.
[4]Park J H,Hong Y K,Bae S,et al.Saturation magnetization and crystalline anisotropy calculations for Mn Al permanent magnet[J].Journal ofApplied Physics,2010,107(9):1444-1556.
[5]Liu X J,Kainuma R,Ohtani H,et al.Phase equilibria in the Mn-rich portion of the binary system Mn Al[J].Journal of Alloys&Compounds,1996,235(2):256-261.
[6]Zeng Q,Baker I,Cui J B,et al.Structural and magnetic properties of nanostructured Mn-Al-C magnetic materials[J].Journal of Magnetism&Magnetic Materials,2007,308(2):214-226.
[7]Su K P,Wang J,Wang H O,et al.Strain-induced coercivity enhancement in Mn51Al46C3flakes prepared by surfactant-assisted ball milling[J].Journal of Alloys&Compounds,2015,640:114-117.
[8]Su K P,Chen X X,Wang H O,et al.Effect of milling on the structure and magnetic properties in Mn54Al46,flakes prepared by surfactant-assisted ball milling[J].Materials Characterization,2016,114:263-266.
[9]Saravanan P,Hsu J H,Vinod V T P,et al.Coercivity enhancement in Mn-Al-Cu flakes produced by surfactantassisted milling[J].Applied Physics Letters,2015,107(19):75S.
[10]Yanar C,Wiezorek J M K,Soffa W A,et al.Massive transformation and the formation of the ferromagnetic L10phase in manganese-aluminum-based alloys[J].Metallurgical&Materials Transactions A,2002,33(8):2413-2423.