Mechanical Properties and Very High Cycle Fatigue Behavior of Peak-Aged AA7021 Alloy
The effect of heat treatment condition on non-Cu AA7021 alloy was investigated with respect to mechanical properties and very high cycle fatigue behavior. With a focus on the influence of heat treatment, AA7021 alloy was solution heat-treated at 470 °C for 4 h and aged at 124 °C. Comparing the resul...
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MDPI AG
2018-12-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/8/12/1023 |
| _version_ | 1818541814253092864 |
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| author | Byung-Hoon Lee Sung-Woo Park Soong-Keun Hyun In-Sik Cho Kyung-Taek Kim |
| author_facet | Byung-Hoon Lee Sung-Woo Park Soong-Keun Hyun In-Sik Cho Kyung-Taek Kim |
| author_sort | Byung-Hoon Lee |
| collection | DOAJ |
| description | The effect of heat treatment condition on non-Cu AA7021 alloy was investigated with respect to mechanical properties and very high cycle fatigue behavior. With a focus on the influence of heat treatment, AA7021 alloy was solution heat-treated at 470 °C for 4 h and aged at 124 °C. Comparing the results of solution-treated and peak-aged AA7021 alloy shows a significant increase in Vickers hardness and tensile strength. The hardness of AA7021 alloy was increased by 65% after aging treatment, and both tensile strength and yield strength were increased by 50~80 MPa in each case. In particular, this paper investigated the very high cycle fatigue behavior of AA7021 alloy with the ultrasonic fatigue testing method using a resonance frequency of 20 kHz. The fatigue results showed that the stress amplitude of peak-aged AA7021 alloy was about 50 MPa higher than the solution-treated alloy at the same fatigue cycles. Furthermore, it was confirmed that the size of the crack initiation site was larger after peak aging than after solution treatment. |
| first_indexed | 2024-12-11T22:14:06Z |
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| id | doaj.art-e55573921a254ab09ae747f1d0e6455f |
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| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-12-11T22:14:06Z |
| publishDate | 2018-12-01 |
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| spelling | doaj.art-e55573921a254ab09ae747f1d0e6455f2022-12-22T00:48:40ZengMDPI AGMetals2075-47012018-12-01812102310.3390/met8121023met8121023Mechanical Properties and Very High Cycle Fatigue Behavior of Peak-Aged AA7021 AlloyByung-Hoon Lee0Sung-Woo Park1Soong-Keun Hyun2In-Sik Cho3Kyung-Taek Kim4Advanced Process and Materials R&D Group, Korea Institute of Industrial Technology, 156, Gaetbeol-ro, Yeonsu-gu, Incheon 21999, KoreaAdvanced Process and Materials R&D Group, Korea Institute of Industrial Technology, 156, Gaetbeol-ro, Yeonsu-gu, Incheon 21999, KoreaDepartment of Advanced Science of Engineering, Inha University, 100, Inha-ro, Michuhol-gu, Incheon 22201, KoreaMbrosia. Co., 70, Sunmoon-ro 22beon-gil, Tangjeong-myeon, Asan-si, Chungcheongnam-do 31460, KoreaAdvanced Process and Materials R&D Group, Korea Institute of Industrial Technology, 156, Gaetbeol-ro, Yeonsu-gu, Incheon 21999, KoreaThe effect of heat treatment condition on non-Cu AA7021 alloy was investigated with respect to mechanical properties and very high cycle fatigue behavior. With a focus on the influence of heat treatment, AA7021 alloy was solution heat-treated at 470 °C for 4 h and aged at 124 °C. Comparing the results of solution-treated and peak-aged AA7021 alloy shows a significant increase in Vickers hardness and tensile strength. The hardness of AA7021 alloy was increased by 65% after aging treatment, and both tensile strength and yield strength were increased by 50~80 MPa in each case. In particular, this paper investigated the very high cycle fatigue behavior of AA7021 alloy with the ultrasonic fatigue testing method using a resonance frequency of 20 kHz. The fatigue results showed that the stress amplitude of peak-aged AA7021 alloy was about 50 MPa higher than the solution-treated alloy at the same fatigue cycles. Furthermore, it was confirmed that the size of the crack initiation site was larger after peak aging than after solution treatment.https://www.mdpi.com/2075-4701/8/12/1023AA7021 alloyage hardeninghardnesstensile testhigh cycle fatigue test |
| spellingShingle | Byung-Hoon Lee Sung-Woo Park Soong-Keun Hyun In-Sik Cho Kyung-Taek Kim Mechanical Properties and Very High Cycle Fatigue Behavior of Peak-Aged AA7021 Alloy Metals AA7021 alloy age hardening hardness tensile test high cycle fatigue test |
| title | Mechanical Properties and Very High Cycle Fatigue Behavior of Peak-Aged AA7021 Alloy |
| title_full | Mechanical Properties and Very High Cycle Fatigue Behavior of Peak-Aged AA7021 Alloy |
| title_fullStr | Mechanical Properties and Very High Cycle Fatigue Behavior of Peak-Aged AA7021 Alloy |
| title_full_unstemmed | Mechanical Properties and Very High Cycle Fatigue Behavior of Peak-Aged AA7021 Alloy |
| title_short | Mechanical Properties and Very High Cycle Fatigue Behavior of Peak-Aged AA7021 Alloy |
| title_sort | mechanical properties and very high cycle fatigue behavior of peak aged aa7021 alloy |
| topic | AA7021 alloy age hardening hardness tensile test high cycle fatigue test |
| url | https://www.mdpi.com/2075-4701/8/12/1023 |
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