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Effect of Cr Addition on Mechanical Properties and Wear Rate of Cast Al-Cu Alloy

Affiliations

  • Department of Mechanical Engineering, Amrita School of Engineering- Coimbatore, Amrita Vishwa Vidyapeetham University, Coimbatore – 641112, Tamil Nadu, India

Abstract


Objectives: This paper investigates the effect of Cr addition on hardness, tensile properties and wear behaviour of Al-4.5Cu alloy A206. Methodology: The base alloy was melted and stirred well, fine Cr powder added in required amount, in oil fired pit furnace and poured into a permanent cast iron mold. The cast specimens were solution heat treated at 540⁰C for 4 hrs and were aged at 170⁰C for 17 hrs and 20 hrs. The as-cast and aged specimens were subjected to microstructure and EDAX evaluation followed by hardness, tensile and wear testing. Findings: The microstructure analysis and EDAX analysis reported an irregularly distributed polyhedral structures that appear blocky due to the phase formation of Al-Cr-Mn-Fe-Si. The hardness, ultimate tensile strength and yield strength were found to increase, reach a peak value and then decrease upon further chromium addition in aged condition. The wear rate decreased with increasing hardness and coefficient of friction remained constant with time. Application/Improvements: Evaluate the effect of Cr in Al alloys on the mechanical strength and wear properties.

Keywords

Al-Cu Alloy, Cr Addition, Heat Treatment, Tensile Properties, Wear Rate.

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References


  • Kabir MS, Minhaj TI, Ashrafi EA, Islam MM. Effect of Cu and Ge on solute clustering in Al–Mg–Si alloys. International Journal of Recent Technology and Engineering. 2014 Jul; 3(3):1–6.
  • Liu M, Banhart J. Effect of Cu and Ge on solute clustering in Al–Mg–Si alloys. Journal of Materials Science and Engineering. 2016 Mar; 658:238–45.
  • Tao GH, Liu CH, Chen JH, Lai YX, Ma PP, Liu LM. The influence of Mg/Si ratio on the negative natural aging effect in Al–Mg–Si–Cu alloys. Journal of Materials Science and Engineering. 2015 Aug; 642:241–8.
  • Marceau RKW, Sha G, Ferragut R, Dupasquier A, Ringer SP. Solute clustering in Al–Cu–Mg alloys during the early stages of elevated temperature ageing. Acta Materialia. 2010 Sep; 58(15):4923–39.
  • Stability of vacancies during solute clustering in Al-Cu-based alloys. Available from: http://journals.aps.org/prb/abstract/10.1103/PhysRevB.65.094107, Date accessed: 07/02/2002.
  • Moller H, Masuku EP, Curle UA, Pistorius PC, Knutsen RD, Govender G. The influence of Mn on the tensile properties of SSM-HPDC Al-Cu-Mg-Ag alloy A201. The Journal of the South African Institute of Mining and Metallurgy. 2011 Mar; 111:167–71.
  • Tsivoulas D, Robson JD. Heterogeneous Zr solute segregation and Al3Zr dispersoid distributions in Al–Cu–Li alloys. Acta Materialia. 2015 Jul; 93:73–86.
  • Thuong NV, Zuhailawati H, Seman AA, Huy TD, Dhindaw BK. Microstructural evolution and wear characteristics of equal channel angular pressing processed semi-solid-cast hypoeutectic aluminum alloys. Materials and Design, Elsevier. 2015 Feb; 67:448–56.
  • Raju K, Ojha SN. Effect of spray forming on the microstructure and wear properties of Al-Si alloys. International Conference in Advances in Manufacturing and Materials Engineering, AMME 2014. Procedia Materials Science. 2014 Sep; 5:345–54.
  • Strengthening Aluminum by Zirconium and Chromium. Available from: http://www.socialweb.net/Events/150751.lasso, Date accessed: 19/12/2012.
  • Timelli G, Ferraro S, Fabrizi A. Effects of chromium and bismuth on secondary aluminium foundry alloys. International Journal of Cast Metals Research. 2013 Nov; 26(4):239–46.
  • Mahajan G, Karve N, Patil U, Kuppan P, Venkatesan K. Analysis of Microstructure, Hardness and Wear of Al-SiC-TiB₂ Hybrid Metal Matrix Composite. Indian Journal of Science and Technology. 2015 Jan; 8(S2):101–5.

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