A new low-temperature internal friction peak in NiTi based alloys

被引：10

作者：

Coluzzi, B. ^{[1
]}

Biscarini, A. ^{[1
]}

Mazzolai, G. ^{[1
]}

Mazzolai, F. M. ^{[1
]}

机构：

[1] Univ Perugia, Dept Phys, I-06100 Perugia, Italy

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2006年 / 442卷 / 1-2期

关键词：

internal friction; NiTi based alloys; martensitic transformation; Young's modulus; calorimetry;

D O I：

10.1016/j.msea.2006.03.125

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The elastic, anelastic and calorimetric behavior of Ni-rich binary Ni50.8Ti49.2 and quaternary Ni47Ti40Hf10Cu3 alloys have been investigated in vacuum annealed and plastically deformed materials. A thermally activated internal friction peak has been detected at around 150 K (1 kHz frequency), which is a distinct feature from the ones previously recorded in the aged and hydrogen-loaded alloys. It has also been found that the ultrasonic attenuation peak reported in the literature for an equi-atomic NiTi alloy is of the same nature as the present one. The common relaxation parameters of these two effects are W = 0.29 +/- 0.02 eV and tau(0) = (8 +/- 2) x 10(-14) s, where W is the activation enthalpy and tau(0) is the limiting relaxation time. The suggested structural mechanisms for the relaxation are stress-assisted motions of vacancies interacting with twin boundaries (annealed state) and with bulk dislocations (plastically deformed state). (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：414 / 417

页数：4

共 24 条

[1] STUDY OF THE HCP-FCC PHASE-TRANSITION IN COBALT BY ACOUSTIC MEASUREMENTS [J].