Preparation of Giant Mangetostrictive Sintered Compacts by Powder Metallurgy

摘要

Powder metallurgy technique was applied to prepare rare earth giant magnetostrictive materials. This preparation process consists of casted Tb_ 0.30Dy_ 0.70Fe_ 1.80 alloy, which is pulverized by ball mill, aligned in magnetic field, compacted and sintered in inertial atmosphere. The experimental results indicate that when the magnetic field is 240 kA·m -1, the sample with particle size less than 0.147 mm being compacted in magnetic field exhibits 1613×10 -3 magnetostriction under a compressive pre-stress 8.0 MPa after being sintered at 1200 ℃ for 2 h and annealed at 950 ℃ for 24 h.