Transactions of Nonferrous Metals Society of China
JOURNAL OF RAILWAY SCIENCE AND ENGINEERING
|Vol. 2 No. 1 February 1992|
（General Research Institute of Non-Ferrous Metals, Being, 100088, China）
Abstract:The relation between the tempering effects of sinterd SmCos alloy at 750℃and its intrinsic coercivity (iHC) has been studied by the use of photoelectron energy spectrum, X-ray diffraction and high-voltage electrop microscope. The result is that the cause of iHC dropping seriously for sintered SmCo5 alloy tempered at 750℃ is not the eutectoid decomposition of SmCo5 and the increase of oxygen. In fact, iHC dropping is caused by that some defect-rich regions in Sm2Co17 decomposed form SmC05 from nucleation centers in reversed magnetization course.
Key words: sintered alloy, tempering effect, intrinsic coercivity, SmCo5