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Enhancing elevated temperature strength of copper containing aluminium alloys by forming L12 Al3Zr precipitates and nucleating θ″ precipitates on them.

Abstract：

:Strengthening by precipitation of second phase is the guiding principle for the development of a host of high strength structural alloys, in particular, aluminium alloys for transportation sector. Higher efficiency and lower emission demands use of alloys at higher operating temperatures (200 °C-250 °C) and stresses, especially in applications for engine parts. Unfortunately, most of the precipitation hardened aluminium alloys that are currently available can withstand maximum temperatures ranging from 150-200 °C. This limit is set by the onset of the rapid coarsening of the precipitates and consequent loss of mechanical properties. In this communication, we present a new approach in designing an Al-based alloy through solid state precipitation route that provides a synergistic coupling of two different types of precipitates that has enabled us to develop coarsening resistant high-temperature alloys that are stable in the temperature range of 250-300 °C with strength in excess of 260 MPa at 250 °C.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Kumar Makineni S,Sugathan S,Meher S,Banerjee R,Bhattacharya S,Kumar S,Chattopadhyay K

doi

10.1038/s41598-017-11540-2

subject

Has Abstract

pub_date

2017-09-11 00:00:00

pages

11154

issue

1

issn

2045-2322

pii

10.1038/s41598-017-11540-2

journal_volume

7

pub_type

杂志文章

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