Decomposition of the Nd2Fe14B intermetallic compound upon severe plastic deformation by shear under pressure

被引：0

作者：

Gaviko, V.S. ^{[1
]}

Popov, A.G. ^{[1
]}

Ermolenko, A.S. ^{[1
]}

Shchegoleva, N.N. ^{[1
]}

Stolyarov, V.V. ^{[1
]}

Gunderov, D.V. ^{[1
]}

机构：

[1] Inst. of Metal Physics, Ural Div., RAS, ul. S. Kovalevskoi 18, Ekaterinburg, 620219, Russia

来源：

Fizika Metallov i Metallovedenie | 2001年 / 92卷 / 02期

关键词：

Alloying elements - Annealing - Boron - Decomposition - High pressure effects - Iron compounds - Neodymium compounds - Phase composition - Phase transitions - Plastic deformation - Shear deformation;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

The effect of severe plastic deformation by shear under high pressure in Bridgman-type anvil setup on the intermetallic compound Nd2Fe14B was studied by structural (X-ray and electron-microscopic) and magnetic methods. Alloys with a different content of this phase were investigated. It was found that under heavy plastic deformation the major part of the compound decomposes into the Fe-enriched bcc and Nd-enriched amorphous phases. With increasing deformation, the volume of the decomposed phase increases. Other phases influence only the rate of Nd2Fe14B compound decomposition. Decomposition is slower in hyperstoichiometric Nd20Fe70B10 and Nd20Fe77.5B2.5 alloys and is faster in hypostoichimetric Nd9Fe84B7 alloy than in nearly stoichiometric Nd11.7Fe82.4B5.9 alloy. The initial phase composition of the deformed samples was restored by fast heating to T > 600°C and subsequent annealing at this temperature for 10-20 minutes. Stepped annealing or slow heating did not result in complete restoration of the initial phase composition. Possible factors that cause the different influence of these anneals on the phase changes are discussed.

引用

页码：58 / 66