By Shuming Pan
The means of extreme temperature part transition of infrequent earth permanent-magnet alloys is published by means of photos taken by means of excessive voltage TEM. the connection among the formation of nanocrystal and magnetic houses is mentioned intimately, which results alloys composition and instruction process.
The scan effects proven a few presumptions, and have been beneficial for next medical examine and developing new permanent-magnet alloys.
The ebook is meant for researchers, engineers and bosses within the box of fabric technological know-how, metallurgy, and physics.
Prof. Shuming Pan is senior engineer of Beijing basic study Institute of Non-ferrous Metal.
Read Online or Download Rare Earth Permanent-Magnet Alloys’ High Temperature Phase Transformation: In Situ and Dynamic Observation and Its Application in Material Design PDF
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The method of extreme temperature part transition of infrequent earth permanent-magnet alloys is published via pictures taken via excessive voltage TEM. the connection among the formation of nanocrystal and magnetic houses is mentioned intimately, which results alloys composition and coaching approach. The scan effects proven a few presumptions, and have been necessary for next medical learn and growing new permanent-magnet alloys.
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Additional resources for Rare Earth Permanent-Magnet Alloys’ High Temperature Phase Transformation: In Situ and Dynamic Observation and Its Application in Material Design
Example text
First-order phase transformation usually goes along with larger heat stagnant, such as phase transformation from Į-Fe to ȕ-Fe (Shi, 2004). 4 one-order differential item has: § wG · Vȕ VĮ ¨ ¸ © wp ¹T § wG · ¨ ¸ © wT ¹ p Sȕ SĮ That is, first-order differential coefficient of free enthalpy at the point of phase transformation, in the other word, in the system there is enthalpy change (absorbing or releasing of latent heat), and also there is volume change, such as phase transformation phenomenon like melting, vaporizing, sublimating, etc.
If an appropriate amount of Nb is added, the coercivity of NdFeB alloys can be greatly increased, while the Curie temperature is also elevated. Based on the in situ and dynamic observation to SmCo5 using JEM-1000 kV super-high voltage TEM, the crystal nuclei of Sm2Co17 phase segregated from the parent phase SmCo5 at 600-750ć grow, collide each other and get together under the phase transition driving force, and thus slowing down the rate of phase transition. At the same time, the crystal nuclei in other regions still grow.
GAnalyze functions of elements for the rear earth ferrous permanent magnetic alloys of ternary system or above, and analyze problem existed in material preparation process in order to improve performance of material. If the relation between the coercivity and the manufacturing process for the rear earth permanent magnetic alloy is described in functional formulate, or say, the coercivity is the function of (element component, melting, milling, forming, sintering, and magnetization). Thus to enhance coercivity it is necessary to optimize every variables in manufacturing process.