Microstructural characterization of NiTi shape memory alloy produced by rotary hot forging

P. Rodrigues; F. M. Braz Fernandes; A. S. Paula; J. P. Oliveira; S. B. Ribeiro; E. N. Texeira; N. Schell

doi:10.1017/S0885715617000549

Microstructural characterization of NiTi shape memory alloy produced by rotary hot forging

P. Rodrigues, F. M. Braz Fernandes, A. S. Paula, J. P. Oliveira, S. B. Ribeiro, E. N. Texeira, N. Schell

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

2 Citations (Scopus)

Abstract

The thermomechanical processing of NiTi shape memory alloys usually involves several steps of hot and/or cold deformation. The present work presents the structural characterization of a Ni-rich NiTi alloy bar, produced by vacuum-induced melting and thermomechanical processing in laboratory scale, aiming at massive production in the future. This study focused on the first step of hot working at 800 °C during rotary forging. Microstructural characterization was performed using differential scanning calorimetry, high- and low-temperature X-ray diffraction (XRD) using a laboratory source and synchrotron XRD. Thus, it was possible to obtain the phase transformation characteristics of the material: the transformation temperatures and the transformation sequence. Proposed thermomechanical processing is intended for production of bars and wires that will be subsequently drawn to get thin wires, for different applications, including orthodontic arch wires.

Original language	English
Pages (from-to)	1-6
Number of pages	6
Journal	Powder Diffraction
Volume	32
Issue number	S1
DOIs	https://doi.org/10.1017/S0885715617000549
Publication status	Published - 2017

Keywords

microstructural characterization
NiTi alloy
phase transformation
rotary hot forging
X-ray diffraction

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abstract = "The thermomechanical processing of NiTi shape memory alloys usually involves several steps of hot and/or cold deformation. The present work presents the structural characterization of a Ni-rich NiTi alloy bar, produced by vacuum-induced melting and thermomechanical processing in laboratory scale, aiming at massive production in the future. This study focused on the first step of hot working at 800 °C during rotary forging. Microstructural characterization was performed using differential scanning calorimetry, high- and low-temperature X-ray diffraction (XRD) using a laboratory source and synchrotron XRD. Thus, it was possible to obtain the phase transformation characteristics of the material: the transformation temperatures and the transformation sequence. Proposed thermomechanical processing is intended for production of bars and wires that will be subsequently drawn to get thin wires, for different applications, including orthodontic arch wires.",

keywords = "microstructural characterization, NiTi alloy, phase transformation, rotary hot forging, X-ray diffraction",

author = "P. Rodrigues and {Braz Fernandes}, {F. M.} and Paula, {A. S.} and Oliveira, {J. P.} and Ribeiro, {S. B.} and Texeira, {E. N.} and N. Schell",

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AU - Rodrigues, P.

AU - Braz Fernandes, F. M.

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AU - Oliveira, J. P.

AU - Ribeiro, S. B.

AU - Texeira, E. N.

AU - Schell, N.

N1 - sem pdf. CENIMAT/I3N by COMPETE through FCT - UID/CTM/50025/2013 ; CAPES - APQ-1 2009/02 E-26/110.414/2010 APQ-1 2011-2 E-26/110.269.2012 E-26/111.435/2012 - CsF/Brazil - BEX 11943-13-0 ; CNPq - 307798/2015-1

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N2 - The thermomechanical processing of NiTi shape memory alloys usually involves several steps of hot and/or cold deformation. The present work presents the structural characterization of a Ni-rich NiTi alloy bar, produced by vacuum-induced melting and thermomechanical processing in laboratory scale, aiming at massive production in the future. This study focused on the first step of hot working at 800 °C during rotary forging. Microstructural characterization was performed using differential scanning calorimetry, high- and low-temperature X-ray diffraction (XRD) using a laboratory source and synchrotron XRD. Thus, it was possible to obtain the phase transformation characteristics of the material: the transformation temperatures and the transformation sequence. Proposed thermomechanical processing is intended for production of bars and wires that will be subsequently drawn to get thin wires, for different applications, including orthodontic arch wires.

AB - The thermomechanical processing of NiTi shape memory alloys usually involves several steps of hot and/or cold deformation. The present work presents the structural characterization of a Ni-rich NiTi alloy bar, produced by vacuum-induced melting and thermomechanical processing in laboratory scale, aiming at massive production in the future. This study focused on the first step of hot working at 800 °C during rotary forging. Microstructural characterization was performed using differential scanning calorimetry, high- and low-temperature X-ray diffraction (XRD) using a laboratory source and synchrotron XRD. Thus, it was possible to obtain the phase transformation characteristics of the material: the transformation temperatures and the transformation sequence. Proposed thermomechanical processing is intended for production of bars and wires that will be subsequently drawn to get thin wires, for different applications, including orthodontic arch wires.

KW - microstructural characterization

KW - NiTi alloy

KW - phase transformation

KW - rotary hot forging

KW - X-ray diffraction

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SP - 1

EP - 6

JO - Powder Diffraction

JF - Powder Diffraction

IS - S1

ER -

Microstructural characterization of NiTi shape memory alloy produced by rotary hot forging

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Keywords

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