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Article
The Effect of Thermo-Mechanical Treatment on Mechanical Properties & Microstructure for (Cu-Al-Ni )Shape Memory Alloy

Authors: Muna Khethier Abbass --- Munther Mohamed Al-Kubaisy --- Raad Suhail Ahmed Adnan
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2016 Volume: 34 Issue: 13 Part (A) Engineering Pages: 2518-2526
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

This paper aims to study the effect of thermo mechanical treatment in different temperatures of (260 ,280& 300) ◦C on the microstructure and mechanical properties of Cu-14wt%Al-4.5wt%Ni shape memory alloy which prepared by casting method in induction furnace under argon atmosphere. Then thermo –mechanical treatment was performed upon the alloy by applying stress of 190MPa with heating upto 260◦C,280◦C,300◦C, then cooled to room temperature performingstrain recovery measurement. Many tests and inspections such as optical and SEM examinations , DSC Measurement ,XRD inspection , compression and Vickers hardness tests were investigated. The results showed that there is an increase in the transformation temperatures, shape memory limits at 300◦C .It was found that hardness increases and Young modulus decreases Also It was found that the thermo-mechanical treatment at 260 ◦C gave better properties , 2%in recovery strain , increase hardness due to the formation of martensitic phase and austenite phase in structure.


Article
Effect of (Ta &Nb) on Corrosion Behavior of Nitinol Alloys

Author: Emad S. Al-Hassani
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2016 Volume: 34 Issue: 9 Part (A) Engineering Pages: 1894-1902
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

In this research, a study of the effect of Ta and Nb additions on the corrosion behavior and properties of Ni-Ti shape memory alloys prepared by powder metallurgy is presented. It was found that; the transformation temperatures and phase structures of the samples prepared consist of martensitic and austenitic phases at room temperature. Also, Vickers hardness values increased with increasing of Ta and Nb additions. Porosity percentages decreased with increasing of addition of Ta and Nb. Finally, the corrosion rate decreased with increasing of Ta and Nb additions.


Article
NUMERICAL AND EXPERIMENTAL STUDY OF SHAPE EFFECT BEHAVIOR OF NITINOL WIRE

Authors: Samir Ali Amin --- Ali Yasser Hassan
Journal: Journal of Engineering and Sustainable Development مجلة الهندسة والتنمية المستدامة ISSN: 25200917 Year: 2019 Volume: 23 Issue: 2 Pages: 1-11
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

The aim of this research, returned NiTinol wire to original length by activation. The experimental test and ANSYS v15 software were conducted to study the shape memory effect behavior for NiTinol wire has high temperature about 80°C±10°C. Full annealing of NiTinol wire was employed with a straight shape, this alloy it consists of (Ni-55%, H-0.001%, O-0.05%, N-0.001%, C-0.05% and Ti-Balance). In this research, a NiTinol wire was implemented (2 mm diameter) and (100 mm length). The experimental results and ANSYS software were almost near. Shape memory effect data constants used in ANSYS software were extracted from the experimental test by applying linear interpolation. These data were hardening parameter (C1) about 900 MPa and elastic limit (C3) about 30 MPa. These data were temperature scaling parameter C4=0.89, maximum transformation strain C5=0.074%, martensite modulus C6=20000 MPa and dependency parameter C7=0. The amount of strain (7 %) applied in this test returned to zero after activation NiTinol wire, and that gives an indication that the permanent deformation is decline. The start austenite temperature (As) was about 58°C±2℃ and finish austenite temperature (Af) was about 70°C±2℃. ANSYS software provided good results when compared with the experimental work.


Article
Investigate the Microstructure and the Mechanical Properties of Ni-Ti-Cu Shape Memory Alloys
التحقيق في البنيه المجهرية والخواص الميكانيكيه لسبائك Ni-Ti-Cu الذاكرة الشكل

Authors: Dania F. Abbas Aljuboori --- Kadhim K.Resan --- Ayad M.Takhakh
Journal: AL-NAHRAIN JOURNAL FOR ENGINEERING SCIENCES مجلة النهرين للعلوم الهندسية ISSN: 25219154 / eISSN 25219162 Year: 2017 Volume: 20 Issue: 1 Pages: 105-112
Publisher: Al-Nahrain University جامعة النهرين

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Abstract

In this study a Nickel-Titanium-Cupper shape memory alloys was manufactured by powder metallurgy (PM) technique, powder mixture of 50% Ti , 47% Ni and 3% Cu was prepared by mixing for two hours and compacted in a press machine using various compacting pressure (600, 700 and 800) MPa , sample was then sintered for 5 hrs in an electrical tube vacuum furnace using sintering temperature of (850˚C, 900˚C and 950˚C) .phase analysis of samples was conducted by X-ray diffraction test, the effect of different sintering temperature and compacting pressure on the porosity, microhardness ,compression strength and the shape memory effect (SME) was studied, the result showed decrease in the porosity and increasing in the shape recovery ,compression strength and microhardness with increasing compacting pressure and at lower sintering temperature and hence the best results was at 800MPa compacting pressure and 850˚C sintering temperature.

في هذه الدراسة تم تصنيع سبائك ذاكره الشكل (نيكل – تيتانيوم – نحاس) بواسطة تقنيه ميتالورجيا المساحيق وتم تحضير النماذج بخلط المساحيق بنسب وزنية (50%Ti)، (47%Ni ) و((3%Cu لمدة ساعتين. تم كبس الخليط بضغط 600،700و 800 ميكا بسكال وبعدها أجراء عملية التلبيد باستخدام فرن كهربائي و لمده 5 ساعات وبدرجات حرارة 950,900,850 ˚م. تم دراسة تكون الأطوار باستخدام مطياف الأشعة السينية , ودراسة تأثير حرارة التلبيد وضغوط الكبس المختلفة على المسامية, الانضغاط,الصلادة وقابليه التذكر للسبائك.النتائج العملية أظهرت زيادة قابليه التذكر,الصلادة, قوة الانضغاط ونقصان المسامية بزيادة الضغط ونقصان درجه حرارة التلبيد وبالتالي فأن أفضل النتائج كانت عند ضغط كبس 800 ميكا بسكال وحرارة تلبيد850˚ م.

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