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Title: Comparative evaluation of cast aluminum alloys for automotive cylinder heads: Part II: Mechanical and thermal properties

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:
 [1] ;  [2] ;  [3] ;  [2] ;  [2]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Indian Inst. of Technology (IIT),Kharagpur (India)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Nemak, Garza Garcia, N.L. (Mexico)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
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
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1360031

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., 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. doi:10.1007/s11661-017-3986-0.
Roy, Shibayan, Allard, Jr, Lawrence Frederick, Rodriguez, Andres, Porter, Wallace D., and Shyam, Amit. 2017. "Comparative evaluation of cast aluminum alloys for automotive cylinder heads: Part II: Mechanical and thermal properties". United States. doi: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 = {2017},
month = {3}
}