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| Keywords | |
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Al-Mg-Si-Cu alloy |
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Pre-ageing treatment |
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Age hardening |
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Differential scanning calorimetry (DSC) curve |
| Authors | |
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HE Li-Zi |
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HAITAO -Zhang |
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JIANZHONG -Cui |
| PubMed | |
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Article by He,L.Z |
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Article by Haitao,.Z |
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Article by Jianzhong,.C |
Effects of Pre-Ageing Treatment on Subsequent Artificial Ageing Characteristics of an Al-1.01Mg-0.68Si-1.78Cu Alloy
Lizi He, Haitao Zhang, Jianzhong Cui
Key Lab of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110004, China
The influences of pre-ageing temperature and natural ageing time on subsequent artificial age hardening behavior and precipitation sequence of new type Al-1.01Mg-0.68Si-1.78Cu alloy were investigated by hardness test, differential scanning calorimetry (DSC) test and transmission electronic microscopy (TEM) observations. When pre-ageing temperature is 20°C (natural ageing), the peak hardness of subsequent artificial aged alloy is lower than that of T6 treated alloy (negative effect), while a positive effect appears when pre-ageing temperature is above 80°C. The size of needlelike β-precipitate in subsequent artificial aged alloy is much coarser when pre-ageing temperature is 20°C, which causes a decrease in peak-hardness. The positive effect occurs again when natural ageing time is longer than 3 weeks. There are seven exothermic peaks in DSC curve of as-quenched alloy, while the number and height of exothermic peak decrease with increasing pre-ageing temperature and natural ageing time.
the National Key Technology R&D Program of China under grant No. 2007BAE38B01.
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