Machining of Shape Memory Alloys through Different Non Conventional Machining Process

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International Journal of Research and Scientific Innovation (IJRSI) | Volume VI, Issue VII, July 2019 | ISSN 2321–2705

Machining of Shape Memory Alloys through Different Non Conventional Machining Process

Shivangi Paliwal1, Dr. P.Sudhakar. Rao2

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1M.E. Scholar, Department of Mechanical Engineering NITTTR, Chandigarh, India
2Assistant Professor, Department of Mechanical Engineering NITTTR, Chandigarh, India

Abstract – Shape Memory Alloys are highly advanced materials which have the capability to restore themselves with change in pressure, temperature etc. They have variety of applications in aerospace, defense, biomedical etc. In case of shape memory alloys, nitinol is most commonly used. The objective of this sort of research is to identify the type of machining required as wire EDM, laser cutting, EDM etc and also to study the effect of various critical parameters as voltage, pulse off time, pulse on time,current on material removal rate, electrode wear rate, surface roughness etc. Thus different machining are used so as to maintain surface integrity in case of shape memory alloy.

Keywords — Shape memory alloys, kerf width, superelasticity, nitinol, material removal rate.

I. INTRODUCTION

Shape memory alloys are those materials which have the ability to regain its shape after severe deformation. They display a special property known as super elasticity [1].There are different types of shape memory alloys as Copper based shape memory alloy (CuAlNi,CuSn),Nickel Titanium based alloys (NiTiCu,NiTiFe,NiTi, NiTiPd,NiTiCo), Iron based alloys (FeMnSi).But mostly NiTi alloys are used [2].SMAs are used in different application of aerospace, medical industry, mobile phone antennas etc [3].They have several properties as high wear resistance, high biocompatibility, high strength to weight ratio, high tensile strength, super elasticity, low density[4].Conventional machining of shape memory alloys are difficult so non-conventional machining as electro discharge machining, laser cutting, wire EDM are used for machining of them [5].There are different types of techniques used in manufacturing of NiTi based shape memory alloys as shown in Figure 1 :