Title :
Effect of the variation in Sm/Cu/Zr content on phase stability of an Sm(Co,Fe,Cu,Zr)7.4 permanent magnet alloy
Author :
Chin, T.S. ; Chang, W.C. ; chang, R.T. ; Hung, M.P. ; Lee, H.T.
Author_Institution :
Dept. of Mater. Sci. & Eng., Nat. Tsing Hua Univ., Hsinchu, Taiwan
fDate :
9/1/1989 12:00:00 AM
Abstract :
The effect of composition variation on the phase stability of an Sm(Co,Fe,Cu,Zr)7.4 system was studied to provide information on interpreting phase changes after partitioning of composition in the heat treatment of this alloy. Three quasi-binary phase diagrams were obtained by X-ray diffractometry, differential thermal analysis, scanning electron microscopy, and energy dispersive X-ray spectroscopy. The zonal and grain boundary phases which are precipitates at the later stages of permanent magnet heat treatment can be explained by these phase diagrams. The major phase of all the alloys studied is either the 2:17 H or 2:17 R phase. However, additional phases appear as a result of compositional variations
Keywords :
X-ray chemical analysis; X-ray diffraction examination of materials; cobalt alloys; copper alloys; ferromagnetic properties of substances; iron alloys; permanent magnets; phase diagrams; samarium alloys; scanning electron microscope examination of materials; thermal analysis; zirconium alloys; Sm-Co-Fe-Cu-Zr; X-ray diffractometry; composition variation; differential thermal analysis; energy dispersive X-ray spectroscopy; grain boundary phases; heat treatment; permanent magnet alloy; phase stability; precipitates; quasi-binary phase diagrams; scanning electron microscopy; zonal phase; Dispersion; Grain boundaries; Heat treatment; Magnetic analysis; Permanent magnets; Scanning electron microscopy; Spectroscopy; Stability; X-ray diffraction; Zirconium;
Journal_Title :
Magnetics, IEEE Transactions on
