Heat Treatments and Thermomechanical Cycling Influences on the R-Phase in Ti-Ni Shape Memory Alloys

被引：13

作者：

Gonzalez, Cezar Henrique ^{[1
]}

do Nascimento Oliveira, Carlos Augusto ^{[1
]}

Cabral de Pina, Euclides Apolinario ^{[1
]}

Urtiga Filho, Severino Leopoldino ^{[1
]}

de Araujo Filho, Oscar Olimpio ^{[1
]}

de Araujo, Carlos Jose ^{[2
]}

机构：

[1] Univ Fed Pernambuco, Dept Mech Engn, BR-50740530 Recife, PE, Brazil

[2] Univ Fed Campina Grande, Dept Mech Engn, BR-58109970 Campina Grande, PB, Brazil

来源：

MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS | 2010年 / 13卷 / 03期

关键词：

shape memory spring; heat treatments; R-phase; ti-ni alloys and thermoelastic properties; TRANSFORMATION; BEHAVIOR;

D O I：

10.1590/S1516-14392010000300008

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This article studies changes observed on the R-phase thermoelastic behavior in a near-equiatomic Ti-Ni shape memory alloy. Three kinds of procedures have been performed: different treatments, thermomechanical cycling under constant loading in shape memory helical springs and thermal cycling in as-treated and trained samples. Several heat treatments were carried out to investigate evolution of the R-phase by differential scanning calorimetry (DSC). A heat treatment was chosen on which R-phase is absent. Shape memory springs were produced and submitted to a training process in an apparatus by tensioning the springs under constant loading. Thermal cycling in DSC was realized in as-treated and trained samples. Several aspects of one-step (B2 -> B19') and two-steps (B2 -> R -> B19') martensitic transformations and R-phase formation and their evolution during tests were observed and discussed.

引用

页码：325 / 331

页数：7

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