Effective Temperature of High Pressure Torsion in Zr-Nb Alloys

被引：26

作者：

Straumal, Boris B. ^{[1
,2
]}

Gornakova, Alena S. ^{[1
]}

Fabrichnaya, Olga B. ^{[3
]}

Kriegel, Mario J. ^{[3
]}

Mazilkin, Andrey A. ^{[1
,2
]}

Baretzky, B. ^{[2
]}

Gusak, A. M. ^{[4
]}

Dobatkin, S. V. ^{[5
]}

机构：

[1] Russian Acad Sci, Inst Solid State Phys, Chernogolovka 142432, Russia

[2] Karlsruher Inst Technol, Inst Nanotechnol, D-76344 Eggenstein Leopoldshafen, Germany

[3] TU Bergakad Freiberg, Inst Werkstoffwissensch, Freiberg, Germany

[4] Cherkasy Natl Univ, Cherkasy, England

[5] Russian Acad Sci, AA Baikov Inst Met & Mat Sci, Moscow 117901, Russia

来源：

HIGH TEMPERATURE MATERIALS AND PROCESSES | 2012年 / 31卷 / 4-5期

基金：

俄罗斯基础研究基金会;

关键词：

Nanocrystalline materials; high pressure torsion; phase transitions; Zr-Nb alloys; SEVERE PLASTIC-DEFORMATION; NANOCRYSTALLINE STRUCTURE; PHASE-TRANSFORMATIONS; MECHANICAL-PROPERTIES; PEARLITIC STEEL; CRYSTAL-STRUCTURES; PURE ZIRCONIUM; SOLID-SOLUTION; CU ALLOY; AL-ZN;

D O I：

10.1515/htmp-2012-0057

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Severe plastic deformation by the high pressure torsion (HPT) leads to the phase transitions and strong grain refinement. The starting alpha Zr-phase in Zr alloyed by 2.5 and 8 mass% Nb transforms into beta + omega mixture. This beta + omega phase mixture can be found in the equilibrium phase diagram at higher (effective) temperature (T-eff = 620 degrees C for Zr-2.5 mass% Nb and T-eff = 550 degrees C for Zr-8 mass% Nb). The published papers on phase transitions during HPT are analysed and the values of effective temperature are estimated. Contrary to the increasing temperature, the increasing pressure slows down the diffusion and grain boundary migration. Therefore, the forced atomic movement during HPT produces the states equivalent to higher temperature, but not to the higher pressure.

引用

页码：339 / 350

页数：12

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