Title

High Temperature Tensile Deformation Behavior Of New Heat Resistant Aluminum Alloy

Keywords

(nickel, cobalt) Al 3 4; 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 298K to 723 K. 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 (1̃8 μm). The Co-Ni based phase was analyzed and confirmed as (Ni, Co)3Al4 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 (723 K), suggesting totally different behaviour vis-a-vis 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)3Al4 could be still maintained at high temperature of 723 K. The deformation mechanism of this alloy was also discussed. © 2011 The Japan Institute of Metals.

Publication Date

11-11-2011

Publication Title

Materials Transactions

Volume

52

Issue

8

Number of Pages

1661-1666

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.2320/matertrans.M2011025

Socpus ID

80655141781 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/80655141781

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