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Chinese Journal of Materials Research  2018, Vol. 32 Issue (4): 263-270    DOI: 10.11901/1005.3093.2017.437
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Effect of Laser Heat Treatment on Microstructure and Mechanical Property of 7075 Al-alloy
Tong LIU, Ruiming SU(), Yingdong QU, Junhua YOU, Yanhua BAI, Rongde LI
School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
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Tong LIU, Ruiming SU, Yingdong QU, Junhua YOU, Yanhua BAI, Rongde LI. Effect of Laser Heat Treatment on Microstructure and Mechanical Property of 7075 Al-alloy. Chinese Journal of Materials Research, 2018, 32(4): 263-270.

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Abstract  

The effect of laser heat treatment, in stead of the retrogression process within the traditional retrogression and re-aging (RRA) treatment, on the microstructure and mechanical property of 7075 Al-alloy was investigated. The results show that the laser heat treatment can effectively replace the regression process of RRA. The hardness of the resulted 7075 Al-alloy exhibits the aging feature with double peaks. After pre-aging, laser treatment (850 W, 2 mm/s) and re-aging, the hardness of 7075 Al-alloy reaches the value of the second peak-aged ones with the highest hardness of 181 HBW, which then presented oxidation-wear character during wear test. The second peak-aged alloy possesses higher hardness and much better tribological performance than the first peak-aged ones. Which may be ascribed to the large number of fine precipitates of η'- and η-phase within the laser treated 7075 Al-alloy.
Key words:  metallic materials      7075 aluminum alloy      laser heat treatment      microstructure      hardness      wear mechanism     
Received:  19 July 2017     
Fund: Supported by National Natural Science Foundation of China (No. 51574167), Doctoral Scientific Research Foundation of Liaoning Province (No. 20170520337), Program for Innovative Research Team in University of Liaoning Province (No. LT2015020) and Science and Technology Program of Liaoning Provincial Department of Education (No. LGD2016003)
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Articles by authors
Tong LIU
Ruiming SU
Yingdong QU
Junhua YOU
Yanhua BAI
Rongde LI

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https://www.cjmr.org/EN/10.11901/1005.3093.2017.437     OR     https://www.cjmr.org/EN/Y2018/V32/I4/263

Cu Mn Mg Cr Zn Ti Al
1.60 0.29 2.86 0.21 6.0 0.17 Bal.
Table 1  Chemical composition of 7075 aluminum alloy (%, mass fraction)
Hot treatment Preaging Retrogression Reaging
Ageing with different power 600~900 W, 2 mm/s
Ageing with different scanning speed 120℃×16 h 850 W, 1~5 mm/s 120℃×16 h
Traditional RRA ageing 240℃×30 s
Table 2  Aging treatments of 7075 aluminum alloy
Fig.1  Average hardness after LRRA treatment with different scanning speed and RRA treatment
Fig.2  Average of hardness after LRRA treatment with different scanning speed and RRA treatment
Fig.3  Hardness distribution of laser treatment layers of 7075 aluminum
Fig.4  Wear mass of samples after LRRA treatment with different laser power and RRA treatment
Fig.5  Wear mass of samples after LRRA treatment with different scanning speed and RRA treatment
Fig.6  Morphology of worn surface of 7075 alloy after different heat treatments (a) LRRA(600 W); (b) LRRA(700 W); (c) LRRA(750 W); (d) LRRA(850 W); (e) LRRA(900 W); (f) LRRA(1 mm/s); (g) LRRA(5 mm/s); (h) RRA
Fig.7  X-ray diffraction patterns of 7075 aluminum alloy with different heat treatments
Fig.8  TEM images of 7075 alloy after different heat treatments (a) 600 W; (b) 850 W; (c) 900 W; (d) 1 mm/s; (e) 5 mm/s; (f) RRA
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