Title

High Temperature Tensile Deformation Behavior Of New Heat Resistant Aluminum Alloy

Keywords

(Ni; Deformation behavior; Heat-resistant aluminum alloy; High temperature tensile; Strengthening phase

Abstract

This study attempted to investigate the high temperature tensile deformation behaviour of new Al-1%Mg-1.1%Si-0.8%CoNi heat resistant aluminium alloy. New aluminium alloy strengthened by Co-Ni based phase was manufactured by using powder ball milling and continuous casting, based on the alloy design & preliminary test. High temperature tensile tests were conducted at various temperatures from 25 °C to 450 °C. OM, SEM, EPMA, XRD, FIB and HR-TEM equipments were used to analyse microstructure, phases, and fracture surface. Microstructure of the new alloy mainly consisted of Al matrix and Co-Ni based phases (1∼8 μm). The Co-Ni based phase was analyzed and confirmed as (Ni, Co)3Al having incoherent interface with matrix. In high temperature tensile results, the new aluminium alloy didn't show significant decrease (19.6%) of strength with increasing temperature (450°C), suggesting totally different behaviour with conventional A319 alloy (87.0% decrease of T.S.). Fractography observation results of new alloy represented the ductile fracture mode with dimples. Voids were mainly initiated at Co-Ni based strengthening phases. It was apparently observed that the strengthening effect of the (Ni, Co)3Al could be still maintained at high temperature of 450 °C. The deformation mechanism of this alloy was also discussed. © 2011 Published by Elsevier Ltd.

Publication Date

1-1-2011

Publication Title

Procedia Engineering

Volume

10

Number of Pages

159-164

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/j.proeng.2011.04.029

Socpus ID

80052958816 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/80052958816

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