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| Microstructure and mechanical property of 7056 aluminum alloy produced by spark plasma sintering |
| HUANG Lanping1,2,3, HE Jun1, LI Song1, CHEN Songyi4, CHEN Kanghua1,2,4 |
1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
2. Key Laboratory of Lightweight High Strength Structural Materials, Central South University, Changsha 410083, China;
3. Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou, 213164, China;
4. Light Alloy Research Institute, Central South University, Changsha 410083, China |
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Abstract The bulk ultra-high strength 7056 aluminum alloys were prepared by spark plasma sintering (SPS) combined with nitrogen atomization process. The effects of sintering temperatures on the density, microstructure and mechanical properties of this consolidated alloy were studied. The results showed that the gas-atomized 7056 aluminum alloy particles of an average of 43.4 μm exhibited a cellular-like dendritic structure with a grain size of about 1-2 μm, obvious solute element segregation was found at grain boundaries. The nearly full dense bulk body could be obtained by spark plasma sintering. It was the yield strength maxium of 284.7 MPa of the consolidated alloy during compression when the sintering temperature was 480 ℃. With the increase of sintering temperature, the yield strength during compression first increased and then decreased. The mechanical properties of the consolidated alloy could be obviously enhanced after solution and aging treatment, the yield strength of alloy was amaxium of 575.9 MPa as sintering temperature was 420 ℃, and gradually decreased with the increase of sintering temperature.
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Received: 01 November 2018
Published: 12 July 2019
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2019, Vol. 24 
