Paper Title
Study on the Micro structural Properties of Aluminium Alloy Strips Fabricated by the Large Strain Extrusion Machining Process
Abstract
Manufacturing of bulk nano structured are in high demand in today’s industry because of recent development and
application of advanced materials. Many traditional machining processes we reused but none of them have been able to
produce complex shapes precisely at low cost. In order to overcome this difficulty Large–strain extrusion
machining(LSEM)is introduced. It is basically a fabrication process. It is a single step manufacturing process. It is a method
of severe plastic deformation (SPD)which is used particularly for machining bulk nano structured materials. It is a low cost
manufacturing technique with advantage of machining and controlling dimensions simultaneously. Different controlled
dimension shapes such as foils, sheets and bars are produced with controlled geometric parameters of the deformation using
this machining process. In the present work experimental investigation and property analysis is carried out. Response surface
methodology (RSM) has been used to develop the input output relations. Feed, rake angle and speed have been considered as
input parameters while micro hardness have been considered as output parameters. Aluminium alloy AL5052 was used as
the raw material. This alloy is widely used in aircrafts, marine, railways and some other important industries. Experiments
are carried out in HMT21 lathe with the help of special design tool post. Based on experiments carried out, Box-Behnken
design technique has been used to develop nonlinear models. The mechanical properties of the strips produced were
measured by micro hardness tester. Also, the surface morphology of strips were studied using scanning electron microscope
(SEM). While measuring the hardness of strips produced it was revealed that hardness of strips was more as compared to the
alloy. Similarly, properties of surface were found to be improved.
Keywords - SPD,RSM, SEM, LSEM, Nano Structured Materials