TY - JOUR
T1 - Phase equilibria and magnetic properties in Mn-Ga-Cu ternary alloys
AU - Minakuchi, Kazuhiro
AU - Sasaki, Masahiro
AU - Ito, Wataru
AU - Nagasako, Makoto
AU - Kainuma, Ryosuke
N1 - Funding Information:
This work was supported by Grant-in-Aids for Scientific Research from the Japan Society for the Promotion of Science (JSPS) and a Grant for Excellent Graduate Schools from MEXT, Japan .
PY - 2014/10/25
Y1 - 2014/10/25
N2 - Phase equilibria at 600 and 800 °C and magnetic properties of some selected alloys in the low Ga portion of the Mn-Ga-Cu ternary system were investigated. It was clarified that the α-fcc (γMn, Cu) and β-bcc (δMn, Cu3Ga) phase exist in a wide composition range along the Ga-Cu side at 800 °C, while a very stable ternary compound, τ2 (Cu5Ga3Mn4, hP12), appears in the center of the low Ga region at 600 °C. It was also confirmed that all the β phase specimens quenched from 800 °C martensitically transform to the 2H, 2M or 6M phase with high density of stacking faults. In the Mn-19.0Ga-25.8Cu (at.%) martensite alloy followed by aging at 400 °C, a high coercivity of 11.7 kOe was detected, which may have resulted from the dispersion of the metastable ferrimagnetic Mn3Ga-D022 phase during the aging treatment.
AB - Phase equilibria at 600 and 800 °C and magnetic properties of some selected alloys in the low Ga portion of the Mn-Ga-Cu ternary system were investigated. It was clarified that the α-fcc (γMn, Cu) and β-bcc (δMn, Cu3Ga) phase exist in a wide composition range along the Ga-Cu side at 800 °C, while a very stable ternary compound, τ2 (Cu5Ga3Mn4, hP12), appears in the center of the low Ga region at 600 °C. It was also confirmed that all the β phase specimens quenched from 800 °C martensitically transform to the 2H, 2M or 6M phase with high density of stacking faults. In the Mn-19.0Ga-25.8Cu (at.%) martensite alloy followed by aging at 400 °C, a high coercivity of 11.7 kOe was detected, which may have resulted from the dispersion of the metastable ferrimagnetic Mn3Ga-D022 phase during the aging treatment.
KW - Coercivity
KW - Martensitic transformation
KW - Phase equilibria
KW - Rear-earth free magnet
UR - http://www.scopus.com/inward/record.url?scp=84902270640&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84902270640&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2014.05.107
DO - 10.1016/j.jallcom.2014.05.107
M3 - Article
AN - SCOPUS:84902270640
VL - 611
SP - 284
EP - 291
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
SN - 0925-8388
ER -