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Effect of Interrupted Quenching on Microstructure and Fracture Toughness of 7N65 Aluminum Alloy
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Lijian LIN1, Yong ZHANG1, Xu ZHENG1, 2, Jianguo TANG1, 3
Mining and Metallurgical Engineering | 2023, 43(5) : 149 - 153
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Mining and Metallurgical Engineering | 2023, 43(5): 149-153
• MATERIALS •
Effect of Interrupted Quenching on Microstructure and Fracture Toughness of 7N65 Aluminum Alloy
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Lijian LIN1, Yong ZHANG1, Xu ZHENG1, 2, Jianguo TANG1, 3
Affiliations
  • 1.School of Materials Science and Engineering, Central South University, Changsha 410083, Hunan, China
  • 2.Guangxi Key Laboratory of Materials and Processes of Aluminum Alloys, ALG Aluminum Inc, Nanning 530031, Guangxi, China
  • 3.Key Laboratory of Nonferrous Metallic Materials Science and Engineering, Ministry of Education, Central South University, Changsha 410083, Hunan, China
Published: 2023-10-01 doi: 10.3969/j.issn.0253-6099.2023.05.034
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Interrupted quenching experiments were conducted to investigate the hardness (HV) and unit initiation energy (UIE) of 7N65 alloy samples at various temperatures with different hold time, and the relative TTP-HV and TTP-UIE contour diagrams were also plotted. The precipitation behavior of second phases at various temperatures was characterized by adopting scanning electron microscope and transmission electron microscope. The findings reveal that S-phase (Al2CuMg) is the dominant grain boundary precipitate after the alloy is held at a temperature between 390 ℃and 450 ℃, and increases in grain size and numbers as hold time is prolonged. Thus the alloy has less fracture toughness and is prone to fragile fracture along with the broken grains. When the alloy sample is held at a temperature between 250 ℃and 390 ℃, precipitates at grain boundaries are predominated by η-phase (MgZn2), which increases in the numbers and grain size as hold time is prolonged, leading to lower strength of inner grain, smaller difference in strength between inner grains and grain boundaries. Thus, the alloy has higher fracture toughness and is more prone to ductile fracture with more transgranular dimples.

7N65 aluminum alloy  /  interrupted quenching  /  fracture toughness  /  aluminum alloy  /  solid solution treating  /  aging  /  unit initiation energy (UIE)  /  TTP curve
Lijian LIN, Yong ZHANG, Xu ZHENG, Jianguo TANG. Effect of Interrupted Quenching on Microstructure and Fracture Toughness of 7N65 Aluminum Alloy[J]. Mining and Metallurgical Engineering, 2023 , 43 (5) : 149 -153 . DOI: 10.3969/j.issn.0253-6099.2023.05.034
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Year 2023 volume 43 Issue 5
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doi: 10.3969/j.issn.0253-6099.2023.05.034
  • Receive Date：2023-04-20
  • Online Date：2026-03-05
  • Published：2023-10-01
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  • Received：2023-04-20
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Affiliations
    1.School of Materials Science and Engineering, Central South University, Changsha 410083, Hunan, China
    2.Guangxi Key Laboratory of Materials and Processes of Aluminum Alloys, ALG Aluminum Inc, Nanning 530031, Guangxi, China
    3.Key Laboratory of Nonferrous Metallic Materials Science and Engineering, Ministry of Education, Central South University, Changsha 410083, Hunan, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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