Study of mechanical alloying of Sm and Fe

Journal Article · Tue Apr 01 04:00:00 EST 1997 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.364674· OSTI ID:496636

Seifu, D; Oliver, F W; Hoffman, E ^[1]; Aning, A ^[2]; Suresh Babu, V; Seehra, M S ^[3]; Catchings, R M ^[4]

---

1. Department of Physics, Morgan State University, Baltimore, Maryland 21239 (United States)
2. Department of Materials Science and Engineering, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061 (United States)
3. Department of Physics, West Virginia University, Morgantown, West Virginia 26506-6315 (United States)
4. Department of Physics, Howard University, Washington, DC 20059 (United States)

Mechanical alloying of Sm and Fe with the composition of SmFe{sub 3} was studied using x-ray-diffraction (XRD), M{umlt o}ssbauer, and magnetization measurements. Data taken as a function of milling time for up to 20 h show significant changes occurring during ball milling. The XRD studies show that the initial crystalline Bragg reflections changed to a broad maximum, which is attributed to the formation of an amorphous phase. The initial six-line pattern in the M{umlt o}ssbauer spectrum, characteristic of magnetic ordering, changed to a broad singlet, characteristic of a nonmagnetic material. Magnetization measurements revealed that the coercive field was at its maximum after 5 h of milling and decreased sharply as the milling time increased. The remanent magnetization was at its maximum between 5 and 10 h of milling. The final product of the ball milling, which exhibited the characteristics of an amorphous paramagnetic material in its XRD and M{umlt o}ssbauer spectrum, was studied after heat treatment. The XRD and the M{umlt o}ssbauer spectra of the heat treated alloy show that substantial changes occurred during heat treatment in that sharp Bragg reflections, characteristic of crystalline materials, reappear and the alloy changed from a paramagnetic to a ferromagnetic state. {copyright} {ital 1997 American Institute of Physics.}

• OSTI ID: 496636
• Report Number(s): CONF-961141--
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 81; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COERCIVE FORCE
FERROMAGNETIC MATERIALS
IRON ALLOYS
MAGNETIZATION
MILLING
MOESSBAUER EFFECT
POWDER METALLURGY
SAMARIUM ALLOYS
TIME DEPENDENCE
X-RAY DIFFRACTION