مقاله انگلیسی رایگان در مورد روش های ساخت آلیاژهای حافظه دار – الزویر 2018

 

مشخصات مقاله
انتشار مقاله سال 2018
تعداد صفحات مقاله انگلیسی 36 صفحه
هزینه دانلود مقاله انگلیسی رایگان میباشد.
منتشر شده در نشریه الزویر
نوع مقاله ISI
عنوان انگلیسی مقاله Methods of fabricating Cu-Al-Ni shape memory alloys
ترجمه عنوان مقاله روش های ساخت آلیاژهای حافظه دار Cu-Al-Ni
فرمت مقاله انگلیسی  PDF
رشته های مرتبط مهندسی مواد
گرایش های مرتبط شکل دادن فلزات
مجله مجله آلیاژها و ترکیبات – Journal of Alloys and Compounds
دانشگاه Automation Division – Tata Steel Limited – India
کلمات کلیدی آلیاژهای حافظه دار Cu-Al-Ni؛ مسیر ریخته گری؛ متالورژی پودر؛ انجماد سریع؛ رسوب اسپری، انتخاب ذرات لیزر
کلمات کلیدی انگلیسی Cu-Al-Ni shape memory alloys; casting route; powder metallurgy; rapid solidification; spray deposition, selective laser melting
شناسه دیجیتال – doi https://doi.org/10.1016/j.jallcom.2018.03.390
کد محصول E8278
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Introduction

Shape memory alloys (SMAs) are an exquisite class of active materials with an ability to regain its original shape at high temperatures. There is a wide range of alloys which exhibit the shape memory effect, but only those alloys are commercially attractive which show a substantial amount of strain recovery and generate significant force due to shape change. Among the Cu-based shape memory alloys, Cu-Al-Ni alloys have a higher thermal stability than Cu-Zn-Al alloys [1, 2]. Therefore, Cu-Al-Ni alloys are being developed for high temperature applications due to their potential to be used as sensors and actuators at temperatures around 200 ºC. On the other hand, Cu-Zn-Al alloys have maximum working temperatures of 120 °C, but they sh ow better ductility as compared to Cu-Al-Ni alloys for low temperature applications [2]. Shape Memory Effect (SME) is shown by alloys exhibiting crystallographically reversible thermo-elastic martensitic transformation. At a higher temperature, the same alloys have another unique property called as super-elasticity [3]. Superelasticity is caused due to large non-linear recoverable strain (up to 18%) upon loading and unloading, in which a specimen once deformed by application of force regain its original shape automatically without any application of heat [1]. The Ni-Ti, ferrous alloys and Cu-based alloys are considered as practical materials for applications among many shape memory alloys. Ni-Ti alloys, an equi-atomic compound of Ni and Ti, are the most widely used shape memory alloys. They show excellent shape memory strain up to 8 % and are thermally stable. However, the reactivity of Ti limits their processing in air and hence all melting operations are to be carried out in vacuum. In recent decades, Cu-based shape memory alloys have emerged as a potential material for variety of applications, such as high damping material, sensors and actuators. Cu-Al-Ni shape memory alloys have gained special attention due to their high thermal stability among the other Cubased shape memory alloys. The presence of SME, thermo-elastic martensitic transformation and crystallography in the Cu-Al-Ni alloy was confirmed by Otsuka [4-6]. Some ferrous alloys also exhibit SME under certain conditions [7]. Fe-Mn-Si alloys are the most important iron-based shape memory alloy. However, they can recover shape memory strain less than 4 %.