Founding Research Journal

Founding Research Journal

Correlation of Microstructure, Hardness and Wear Resistance of Aluminum 3000 Series with Li Additive Fabricated by Horizontal Centrifugal Casting Method

Document Type : Original Research Article

Authors
Amir Rezaie 1
Seyed Ebrahim Vahdat 2
1 MSc Student, Department of Engineering, Ayatollah Amoli Branch, Islamic Azad University, Amol, Iran.‎
2 Assistant Professor, Department of Engineering, Ayatollah Amoli Branch, Islamic Azad University, Amol, Iran.‎
10.22034/frj.2018.148128.1050
Abstract
The purpose of this study was to investigate the microstructure, hardness and wear resistance of lightweight 3000 series Al functionally graded tube containing 2.3 wt.% Li at the inner, middle and outer layers. For this purpose, an Al-8.1 wt.% Si-2.7 wt.% copper- 2.3 wt.% Li tube fabricated at a pouring temperature of 750°C and a final rotation of mould at 1000 rpm by using a horizontal centrifugal casting machine. Mould was preheated up to 150°C. Microscopic evaluation has been carried out by using VEGA2 scanning electron microscopy; micro-hardness evaluation has done by using Vickers method at 50 gr and evaluation of wear resistance has been carried out by using a pin on disc method under a stress of 7.6 MPa in a distance of 1000 m. The results indicated that the amount of Li, Si and Cu has gradually increased from the outer surface to the inner surface of the tube. Also, the sum of the existing phases in the matrix, such as β-intermetallic compounds (ie, AlxLi, AlSi and Al2Cu) has increased from 17 vol.% to 35 vol.% at the outer surface to the inner surface of the tube. For this reason, the hardness has increased from 95 HV at the outer surface to 251 HV at the inner layer. As a result, the wear resistance of the inner surface has increased 18 percent over the outer surface.
Keywords
Functionally graded material
Intermetallic compound
Solid solution
Wear
Subjects
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Founding Research Journal
Volume 2, Issue 4 - Serial Number 7
Spring 2019
Pages 239-249

  • Receive Date 09 September 2018
  • Revise Date 28 November 2018
  • Accept Date 23 December 2018