It is well known that an SmCo5 magnet quenched at about 900℃ has high coercivity iHc. But annealing at about 700℃ causes a rapid decrease of iHc. It has been considered that the drop of iHc is caused by the precipit...It is well known that an SmCo5 magnet quenched at about 900℃ has high coercivity iHc. But annealing at about 700℃ causes a rapid decrease of iHc. It has been considered that the drop of iHc is caused by the precipitation of Sm2Co17 phase in the SmCo5 matrix, and the precipitates act as the centers of reversed magnetic do-展开更多
Ⅰ. INTRODUCTION The deformed-thermochemical treatment is a new technology of heat treatment which has a bright future. But there are some discrepancies as to whether the dislocations produced in room temperature pre-...Ⅰ. INTRODUCTION The deformed-thermochemical treatment is a new technology of heat treatment which has a bright future. But there are some discrepancies as to whether the dislocations produced in room temperature pre-deformation will accelerate the carbonitriding process or retard it.展开更多
I.INTRODUCTION It has long been well-known that Cu-base shape memory alloys are very sensitive to aging treatment. However, it is only in recent years that the stabilization effect of thermoelastic martensite has been...I.INTRODUCTION It has long been well-known that Cu-base shape memory alloys are very sensitive to aging treatment. However, it is only in recent years that the stabilization effect of thermoelastic martensite has been found and has attracted great attention of some investigators of shape memory alloys. Several mechanisms, such as reordering in展开更多
Ⅰ. INTRODUCTIONGenerally speaking, when metals are deformed, the S-parameter of positron annihilation increases obviously with the strain increasing. The parameter gradually tends to saturation when the strain is get...Ⅰ. INTRODUCTIONGenerally speaking, when metals are deformed, the S-parameter of positron annihilation increases obviously with the strain increasing. The parameter gradually tends to saturation when the strain is getting larger and larger. Park et al. concluded that the variation of positron lifetime with the strain was dependent on the conditions of deformation (coldrolling, bending and tensile stretching at 200 K). The lifetimes of positron at the edge and展开更多
文摘It is well known that an SmCo5 magnet quenched at about 900℃ has high coercivity iHc. But annealing at about 700℃ causes a rapid decrease of iHc. It has been considered that the drop of iHc is caused by the precipitation of Sm2Co17 phase in the SmCo5 matrix, and the precipitates act as the centers of reversed magnetic do-
文摘Ⅰ. INTRODUCTION The deformed-thermochemical treatment is a new technology of heat treatment which has a bright future. But there are some discrepancies as to whether the dislocations produced in room temperature pre-deformation will accelerate the carbonitriding process or retard it.
文摘I.INTRODUCTION It has long been well-known that Cu-base shape memory alloys are very sensitive to aging treatment. However, it is only in recent years that the stabilization effect of thermoelastic martensite has been found and has attracted great attention of some investigators of shape memory alloys. Several mechanisms, such as reordering in
文摘Ⅰ. INTRODUCTIONGenerally speaking, when metals are deformed, the S-parameter of positron annihilation increases obviously with the strain increasing. The parameter gradually tends to saturation when the strain is getting larger and larger. Park et al. concluded that the variation of positron lifetime with the strain was dependent on the conditions of deformation (coldrolling, bending and tensile stretching at 200 K). The lifetimes of positron at the edge and