Microstructure characterization of ball milled Sm(CoCuFeZr) 2:17 powders

Journal Article · Sun May 15 04:00:00 EDT 2005 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.1853851· OSTI ID:20711632

Zhang, Y; Zeng, Q; Hadjipanayis, G C ^[1]

---

1. Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716 (United States)

The microstructure evolution and coercivity development in ball milled Sm(Co,Cu,Fe,Zr){sub z} powders have been investigated by TEM, SEM, HRTEM, and VSM. The fully heat-treated Sm(Co{sub bal},Fe{sub 0.1},Cu{sub 0.08},Zr{sub 0.03}){sub 7.5} and Sm(Co{sub bal},Fe{sub 0.1},Cu{sub 0.08},Zr{sub 0.03}){sub 8.3} alloys were ball milled to powders with different ball milling rates and times. At a low ball milling rate, both the particle size and coercivity decrease slowly and monotonically with increasing milling time. Even after 48 h milling, both powders with an average particle size of about 2 {mu}m still retain about 40%-50% of their initial coercivity. Both the cellular and lamellar structures are still observed in the two powders even after 48 h milling, although crystal lattice distortion and defects are introduced into the cellular and lamellar structures in both powders. At a high milling rate, both the particle size and the coercivity drop sharply with milling time for both powders, and even 2 min milling leads to the loss of 50% of the initial coercivity; the mean particle size was measured to be 5 {mu}m, whereas the initial cellular structure was significantly destroyed and highly strained. Further ball milling leads to sample oxidation and the formation of amorphous phase.

• OSTI ID: 20711632
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 10 Vol. 97; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AMORPHOUS STATE
COBALT ALLOYS
COERCIVE FORCE
COPPER ALLOYS
CRYSTAL LATTICES
FERROMAGNETIC MATERIALS
GRAIN BOUNDARIES
HEAT TREATMENTS
IRON ALLOYS
MILLING
MORPHOLOGY
OXIDATION
PARTICLE SIZE
PARTICLES
POWDERS
SAMARIUM ALLOYS
SCANNING ELECTRON MICROSCOPY
TRANSMISSION ELECTRON MICROSCOPY
VIBRATING SAMPLE MAGNETOMETERS
ZIRCONIUM ALLOYS