Effect of cold rolling ratio on the microstructure and recovery properties of Ti-Ni-Nb-Co shape memory alloys

Bo Cui; Jian Yao; Ye Wu; Wei Cai

doi:10.1016/j.jallcom.2018.09.113

Effect of cold rolling ratio on the microstructure and recovery properties of Ti-Ni-Nb-Co shape memory alloys

Bo Cui
, Jian Yao
, Ye Wu
, Wei Cai^*

^*Corresponding author for this work

Harbin Institute of Technology

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

Abstract

The Ti_44.5Ni_44.5Nb₉Co₂ alloys with different cold rolling ratios were annealed at 650 °C to investigate the influence of cold rolling ratio on the microstructure and recovery properties. The change in cold rolling ratio remarkably affected the distribution of β-Nb phase and the density of dislocations and precipitates. The density of dislocations increased with the increase of cold rolling ratio, which facilitated preferential nucleation and growth of Ti₂Co precipitates. Meanwhile, high density of dislocations and precipitates retarded the recovery and recrystallization process. Owing to the strengthening effect of dislocations and nanoscale precipitates, the 40% cold rolled Ti_44.5Ni_44.5Nb₉Co₂ alloy annealed at 650 °C after 16% pre-strain exhibited 25% enhancement in the total recovery strain and over 50% improvement for the recovery stress compared to the typical Ti-Ni-Nb alloys.

Original language	English
Pages (from-to)	728-734
Number of pages	7
Journal	Journal of Alloys and Compounds
Volume	772
DOIs	https://doi.org/10.1016/j.jallcom.2018.09.113
State	Published - 25 Jan 2019
Externally published	Yes

Keywords

Nanoscale precipitates
Recovery and recrystallization
Recovery properties
Ti-Ni-Nb-Co alloys
Wide hysteresis shape memory alloys

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10.1016/j.jallcom.2018.09.113

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@article{3624a5d21e3d470b835c3a9b290b5ec3,

title = "Effect of cold rolling ratio on the microstructure and recovery properties of Ti-Ni-Nb-Co shape memory alloys",

abstract = "The Ti44.5Ni44.5Nb9Co2 alloys with different cold rolling ratios were annealed at 650 °C to investigate the influence of cold rolling ratio on the microstructure and recovery properties. The change in cold rolling ratio remarkably affected the distribution of β-Nb phase and the density of dislocations and precipitates. The density of dislocations increased with the increase of cold rolling ratio, which facilitated preferential nucleation and growth of Ti2Co precipitates. Meanwhile, high density of dislocations and precipitates retarded the recovery and recrystallization process. Owing to the strengthening effect of dislocations and nanoscale precipitates, the 40\% cold rolled Ti44.5Ni44.5Nb9Co2 alloy annealed at 650 °C after 16\% pre-strain exhibited 25\% enhancement in the total recovery strain and over 50\% improvement for the recovery stress compared to the typical Ti-Ni-Nb alloys.",

keywords = "Nanoscale precipitates, Recovery and recrystallization, Recovery properties, Ti-Ni-Nb-Co alloys, Wide hysteresis shape memory alloys",

author = "Bo Cui and Jian Yao and Ye Wu and Wei Cai",

note = "Publisher Copyright: {\textcopyright} 2018 Elsevier B.V.",

year = "2019",

month = jan,

day = "25",

doi = "10.1016/j.jallcom.2018.09.113",

language = "英语",

volume = "772",

pages = "728--734",

journal = "Journal of Alloys and Compounds",

issn = "0925-8388",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Effect of cold rolling ratio on the microstructure and recovery properties of Ti-Ni-Nb-Co shape memory alloys

AU - Cui, Bo

AU - Yao, Jian

AU - Wu, Ye

AU - Cai, Wei

PY - 2019/1/25

Y1 - 2019/1/25

N2 - The Ti44.5Ni44.5Nb9Co2 alloys with different cold rolling ratios were annealed at 650 °C to investigate the influence of cold rolling ratio on the microstructure and recovery properties. The change in cold rolling ratio remarkably affected the distribution of β-Nb phase and the density of dislocations and precipitates. The density of dislocations increased with the increase of cold rolling ratio, which facilitated preferential nucleation and growth of Ti2Co precipitates. Meanwhile, high density of dislocations and precipitates retarded the recovery and recrystallization process. Owing to the strengthening effect of dislocations and nanoscale precipitates, the 40% cold rolled Ti44.5Ni44.5Nb9Co2 alloy annealed at 650 °C after 16% pre-strain exhibited 25% enhancement in the total recovery strain and over 50% improvement for the recovery stress compared to the typical Ti-Ni-Nb alloys.

AB - The Ti44.5Ni44.5Nb9Co2 alloys with different cold rolling ratios were annealed at 650 °C to investigate the influence of cold rolling ratio on the microstructure and recovery properties. The change in cold rolling ratio remarkably affected the distribution of β-Nb phase and the density of dislocations and precipitates. The density of dislocations increased with the increase of cold rolling ratio, which facilitated preferential nucleation and growth of Ti2Co precipitates. Meanwhile, high density of dislocations and precipitates retarded the recovery and recrystallization process. Owing to the strengthening effect of dislocations and nanoscale precipitates, the 40% cold rolled Ti44.5Ni44.5Nb9Co2 alloy annealed at 650 °C after 16% pre-strain exhibited 25% enhancement in the total recovery strain and over 50% improvement for the recovery stress compared to the typical Ti-Ni-Nb alloys.

KW - Nanoscale precipitates

KW - Recovery and recrystallization

KW - Recovery properties

KW - Ti-Ni-Nb-Co alloys

KW - Wide hysteresis shape memory alloys

UR - https://www.scopus.com/pages/publications/85053540857

U2 - 10.1016/j.jallcom.2018.09.113

DO - 10.1016/j.jallcom.2018.09.113

M3 - 文章

AN - SCOPUS:85053540857

SN - 0925-8388

VL - 772

SP - 728

EP - 734

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

ER -

Effect of cold rolling ratio on the microstructure and recovery properties of Ti-Ni-Nb-Co shape memory alloys

Abstract

Keywords

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