Hybrid Treatment and Natural Aging Behavior of Peak-Aged Eutectoid Steel Powder-Reinforced Al 7075 Matrix Composites
The current work focuses on the natural aging phenomenon of a eutectoid steel powder-(0.8 wt.%) reinforced Al-Zn-Mg (Al 7075) alloy, which was subjected to a hybrid heat treatment. The hybrid treatment comprises the aging treatment of a matrix and the conventional treatment of a steel reinforcement...
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| Veröffentlicht in: | Journal of composites science 2024-03, Vol.8 (3), p.89 |
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| creator | Hegde, Ananda Birur Manjunathaiah, Karthik Sharma, Sathyashankara Mandya Chennegowda, Gowrishankar Anne, Gajanan Sadanand, Ramakrishna Vikas |
| description | The current work focuses on the natural aging phenomenon of a eutectoid steel powder-(0.8 wt.%) reinforced Al-Zn-Mg (Al 7075) alloy, which was subjected to a hybrid heat treatment. The hybrid treatment comprises the aging treatment of a matrix and the conventional treatment of a steel reinforcement in a single stretch on the stir cast composite. This material finds uses in space and transportation applications. The hybrid treatment consists of a conventional heat treatment cycle to obtain pearlite, bainite, and martensite phases in steel powder, followed by an age-hardening treatment for the Al 7075 matrix. This hybrid heat treatment resulted in improvements in the hardness and strength over the conventional aging treatment. The peak-aged hybrid specimens were subjected to natural aging in an open atmosphere for a continuous duration of 25 weeks to study the stability of the properties after peak aging. Tests of the mechanical properties such as the hardness and tensile strength along with microstructure analysis were carried out. During natural aging, the hardness of composites decreases irrespective of the quantity of the reinforcement in the composites and the type of reinforcement phase alteration during hybrid heat treatment. Also, the composites subjected to hybrid heat treatment show better resistance to natural aging compared to the conventionally aged samples. Within the group, the hybrid-treated martensite formed into a composite with 6 wt.% reinforcement showed only a 4% reduction in hardness during natural aging, which is an indication of a decent level of resistance to natural aging. |
| doi_str_mv | 10.3390/jcs8030089 |
| format | Article |
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The hybrid treatment comprises the aging treatment of a matrix and the conventional treatment of a steel reinforcement in a single stretch on the stir cast composite. This material finds uses in space and transportation applications. The hybrid treatment consists of a conventional heat treatment cycle to obtain pearlite, bainite, and martensite phases in steel powder, followed by an age-hardening treatment for the Al 7075 matrix. This hybrid heat treatment resulted in improvements in the hardness and strength over the conventional aging treatment. The peak-aged hybrid specimens were subjected to natural aging in an open atmosphere for a continuous duration of 25 weeks to study the stability of the properties after peak aging. Tests of the mechanical properties such as the hardness and tensile strength along with microstructure analysis were carried out. During natural aging, the hardness of composites decreases irrespective of the quantity of the reinforcement in the composites and the type of reinforcement phase alteration during hybrid heat treatment. Also, the composites subjected to hybrid heat treatment show better resistance to natural aging compared to the conventionally aged samples. Within the group, the hybrid-treated martensite formed into a composite with 6 wt.% reinforcement showed only a 4% reduction in hardness during natural aging, which is an indication of a decent level of resistance to natural aging.</description><identifier>ISSN: 2504-477X</identifier><identifier>EISSN: 2504-477X</identifier><identifier>DOI: 10.3390/jcs8030089</identifier><language>eng</language><publisher>Basel: MDPI AG</publisher><subject>Aging (artificial) ; Aging (natural) ; Alloys ; Aluminum alloys ; Aluminum base alloys ; Aluminum matrix composites ; Analysis ; Bainite ; Composite materials ; Eutectoid composition ; Eutectoids ; Hardness ; Heat treatment ; Magnesium ; Martensite ; Mechanical properties ; Metal powders ; Pearlite ; Powders ; Reinforcement ; Solid solutions ; Steel ; Temperature ; Tensile strength ; Transportation applications ; Zinc compounds</subject><ispartof>Journal of composites science, 2024-03, Vol.8 (3), p.89</ispartof><rights>COPYRIGHT 2024 MDPI AG</rights><rights>2024 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). 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During natural aging, the hardness of composites decreases irrespective of the quantity of the reinforcement in the composites and the type of reinforcement phase alteration during hybrid heat treatment. Also, the composites subjected to hybrid heat treatment show better resistance to natural aging compared to the conventionally aged samples. Within the group, the hybrid-treated martensite formed into a composite with 6 wt.% reinforcement showed only a 4% reduction in hardness during natural aging, which is an indication of a decent level of resistance to natural aging.</abstract><cop>Basel</cop><pub>MDPI AG</pub><doi>10.3390/jcs8030089</doi><orcidid>https://orcid.org/0000-0002-8354-8893</orcidid><orcidid>https://orcid.org/0000-0001-7865-1928</orcidid><orcidid>https://orcid.org/0000-0002-5769-9874</orcidid><oa>free_for_read</oa></addata></record> |
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| ispartof | Journal of composites science, 2024-03, Vol.8 (3), p.89 |
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| source | MDPI - Multidisciplinary Digital Publishing Institute; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals |
| subjects | Aging (artificial) Aging (natural) Alloys Aluminum alloys Aluminum base alloys Aluminum matrix composites Analysis Bainite Composite materials Eutectoid composition Eutectoids Hardness Heat treatment Magnesium Martensite Mechanical properties Metal powders Pearlite Powders Reinforcement Solid solutions Steel Temperature Tensile strength Transportation applications Zinc compounds |
| title | Hybrid Treatment and Natural Aging Behavior of Peak-Aged Eutectoid Steel Powder-Reinforced Al 7075 Matrix Composites |
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