Paper Titles
Temperature and Strain Rate Effects on Plastic Deformation of Titanium Alloys
p.3619
Beta Phase Decomposition in a TiAl Alloy during Continuous Cooling
p.3625
Production of Functionally-Graded Samples Using Simultaneous Powder and Wire-Feed
p.3631
An Experimental and Modelling Study of Laser Fabricated Samples
p.3637
New Process-Microstructure Method for Affordable 2024 Series Aerospace Aluminum Alloys
p.3643
Effect of Surface Oxide Films on Degradation of Titanium
p.3649
Optimization of the Equal Channel Angular Pressing (ECAP) Process for Strain Homogeneity
p.3655
A Physically Based Flow Rule for the Simulation of Ti-6Al-4V Forging in the α - β Range
p.3661
Micro Metal Injection Molding Process for High Performance Titanium Alloy
p.3667

New Process-Microstructure Method for Affordable 2024 Series Aerospace Aluminum Alloys

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Abstract:

New affordable 2024 series aerospace aluminum alloy has been developed. Fracture toughness has been demonstrated increase in inverse proportion to the root of the distance between constituents, Cu2FeAl7, formed during ingot solidification. Higher fracture toughness material is obtained by means of combination of reduction of Fe content and wider spacing between the constituents. The fractured surface of those materials has been confirmed to show larger dimples due to the wider constituents. An outcome is the fracture toughness increases 20% through broadening the space from 75 to 140μm. Fatigue crack growth (FCG) has been governed by the morphology of dispersoids such as Cu2MnAl20, Cr2Mg3Al18 and ZrAl3, formed in homogenization process during heat treatment of ingot. In a low ΔK region, the FCG rate is slower when Cu2MnAl20 becomes larger. It is reconfirmed that the FCG rate is still faster for small dispersoids, Cr2Mg3Al18 or ZrAl3 bearing materials than Cu2MnAl20 bearing one through bridging effect of dispersoids. In a high ΔK region, on the other hands, the FCG rate becomes slower by broadening the spacing of the constituents. A new 2024 series alloy (2x24) with high fracture toughness and excellent FCG resistance has been developed on the basis of process- microstructure-structure methods.

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Periodical:

Materials Science Forum (Volumes 539-543)

Pages:

3643-3648

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.539-543.3643

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Online since:

March 2007

Authors:

Takehiko Eto, Manabu Nakai

Keywords:

2024 Series Aluminium Alloys, Constituents, Dispersoid, Fatigue Crack Growth (FCG), Fracture Toughness, Heat Treatment, Precipitation

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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