Comparative Evaluation of Cast Aluminum Alloys for Automotive Cylinder Heads: Part II—Mechanical and Thermal Properties

Shibayan Roy; Lawrence F. Allard; Andres Rodriguez; Wallace D. Porter; Amit Shyam

doi:10.1007/s11661-017-3986-0

Comparative Evaluation of Cast Aluminum Alloys for Automotive Cylinder Heads: Part II—Mechanical and Thermal Properties

Shibayan Roy, Lawrence F. Allard, Andres Rodriguez, Wallace D. Porter, Amit Shyam

Research output: Contribution to journal › Article › peer-review

74 Scopus citations

Abstract

The first part of this study documented the as-aged microstructure of five cast aluminum alloys namely, 206, 319, 356, A356, and A356+0.5Cu, that are used for manufacturing automotive cylinder heads (Roy et al. in Metall Mater Trans A, 2016). In the present part, we report the mechanical response of these alloys after they have been subjected to various levels of thermal exposure. In addition, the thermophysical properties of these alloys are also reported over a wide temperature range. The hardness variation due to extended thermal exposure is related to the evolution of the nano-scale strengthening precipitates for different alloy systems (Al-Cu, Al-Si-Cu, and Al-Si). The effect of strengthening precipitates (size and number density) on the mechanical response is most obvious in the as-aged condition, which is quantitatively demonstrated by implementing a strength model. Significant coarsening of precipitates from long-term heat treatment removes the strengthening efficiency of the nano-scale precipitates for all these alloys systems. Thermal conductivity of the alloys evolve in an inverse manner with precipitate coarsening compared to the strength, and the implications of the same for the durability of cylinder heads are noted.

Original language	English
Pages (from-to)	2543-2562
Number of pages	20
Journal	Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume	48
Issue number	5
DOIs	https://doi.org/10.1007/s11661-017-3986-0
State	Published - May 1 2017

Bibliographical note

Publisher Copyright:
© 2017, The Minerals, Metals & Materials Society and ASM International.

Funding

The authors acknowledge Dana McClurg for the indentation experiments and Zach LaDouceur and Patrick Shower for image analysis. The research was sponsored by the Propulsion Materials Program, DOE Office of Vehicle Technologies. This research utilized some equipment purchased by the Oak Ridge National Laboratory’s High Temperature Materials Laboratory User Program which was sponsored by the U. S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Vehicle Technologies Program.

Funders	Funder number
DOE Office of Vehicle Technologies
U.S. Department of Energy
Office of Energy Efficiency and Renewable Energy
Oak Ridge National Laboratory

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abstract = "The first part of this study documented the as-aged microstructure of five cast aluminum alloys namely, 206, 319, 356, A356, and A356+0.5Cu, that are used for manufacturing automotive cylinder heads (Roy et al. in Metall Mater Trans A, 2016). In the present part, we report the mechanical response of these alloys after they have been subjected to various levels of thermal exposure. In addition, the thermophysical properties of these alloys are also reported over a wide temperature range. The hardness variation due to extended thermal exposure is related to the evolution of the nano-scale strengthening precipitates for different alloy systems (Al-Cu, Al-Si-Cu, and Al-Si). The effect of strengthening precipitates (size and number density) on the mechanical response is most obvious in the as-aged condition, which is quantitatively demonstrated by implementing a strength model. Significant coarsening of precipitates from long-term heat treatment removes the strengthening efficiency of the nano-scale precipitates for all these alloys systems. Thermal conductivity of the alloys evolve in an inverse manner with precipitate coarsening compared to the strength, and the implications of the same for the durability of cylinder heads are noted.",

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Comparative Evaluation of Cast Aluminum Alloys for Automotive Cylinder Heads: Part II—Mechanical and Thermal Properties. / Roy, Shibayan; Allard, Lawrence F.; Rodriguez, Andres et al.
In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, Vol. 48, No. 5, 01.05.2017, p. 2543-2562.

Research output: Contribution to journal › Article › peer-review

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Comparative Evaluation of Cast Aluminum Alloys for Automotive Cylinder Heads: Part II—Mechanical and Thermal Properties

Abstract

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