Comparative evaluation of cast aluminum alloys for automotive cylinder heads: Part II: Mechanical and thermal properties
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.
- Authors:
-
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Indian Inst. of Technology (IIT),Kharagpur (India)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Nemak, Garza Garcia, N.L. (Mexico)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1360031
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science
- Additional Journal Information:
- Journal Volume: 48; Journal Issue: 5; Journal ID: ISSN 1073-5623
- Publisher:
- ASM International
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Roy, Shibayan, Allard, Jr, Lawrence Frederick, Rodriguez, Andres, Porter, Wallace D., and Shyam, Amit. Comparative evaluation of cast aluminum alloys for automotive cylinder heads: Part II: Mechanical and thermal properties. United States: N. p., 2017.
Web. doi:10.1007/s11661-017-3986-0.
Roy, Shibayan, Allard, Jr, Lawrence Frederick, Rodriguez, Andres, Porter, Wallace D., & Shyam, Amit. Comparative evaluation of cast aluminum alloys for automotive cylinder heads: Part II: Mechanical and thermal properties. United States. https://doi.org/10.1007/s11661-017-3986-0
Roy, Shibayan, Allard, Jr, Lawrence Frederick, Rodriguez, Andres, Porter, Wallace D., and Shyam, Amit. Wed .
"Comparative evaluation of cast aluminum alloys for automotive cylinder heads: Part II: Mechanical and thermal properties". United States. https://doi.org/10.1007/s11661-017-3986-0. https://www.osti.gov/servlets/purl/1360031.
@article{osti_1360031,
title = {Comparative evaluation of cast aluminum alloys for automotive cylinder heads: Part II: Mechanical and thermal properties},
author = {Roy, Shibayan and Allard, Jr, Lawrence Frederick and Rodriguez, Andres and Porter, Wallace D. and Shyam, Amit},
abstractNote = {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.},
doi = {10.1007/s11661-017-3986-0},
journal = {Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science},
number = 5,
volume = 48,
place = {United States},
year = {Wed Mar 08 00:00:00 EST 2017},
month = {Wed Mar 08 00:00:00 EST 2017}
}
Web of Science
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