72nd Magnetic Materials Center Seminar
April 10, 2008, 9:00-
7th floor small seminar room, Sengen
Mechanical property and microstructure of extruded Mg-Sn-Zn based alloy
T. Sasaki
Although precipitation hardening is effective for adding high strength to wrought alloys, only a limited number of studies have been devoted to utilize precipitation hardening and to understand the precipitation process in Mg alloys. Our magnesium research aims to explore possibilities to develop high strength wought alloy utilizing precipitation hardening.
In the presentation, some progress will be reported about the extruded Mg-Sn-Zn alloy containing Ca+Ag, Cu or Al. Based on the microstructure analyses, the way to increase its strength will be discussed.

Mg-Ca alloys of age hardening development
R. Watanabe
Mg-Ca alloy has good combination of strength ,creep resistance ,and low cost. of Nie reported age hardening response of mg-ca alloy can be improved by added small amount of Zn. An small amount of Zn to Mg-Ca alloy was investigated by J.C. Oh et all.
In previous work ,I talked Mg-0.3Ca-1.8Zn alloy. In this work, I show the analysis of the microstructure. And I will introduce new composition.

Microstructure of sintered NdDyFeB magnets with different heat treatment conditions
W. Li
Addition of Dy and post sintering heat treatment can both increase the coercivity of the sintered magnet greatly. a lot of investigations have been done to get optimal heat treatment conditions and to get optimal distribution of Dy in the sintered magnet, because Dy is much more expensive and also it couples antiferromamgetically with Fe. In this report microstructure of sintered NdDyFeB magnet experienced different annealing conditions would be discussed. Focuses have been put on the grain boundaries of the hard magnetic phase, and also the distribution of Dy in the intergranular region by employing SEM, TEM and FIB.