Research on Hot Deformation Behaviors of Discontinuously Reinforced Aluminum Composites

doi:10.11900/0412.1961.2018.00461

Acta Metall Sin

2019, Vol. 55

Issue (1): 59-72 DOI: 10.11900/0412.1961.2018.00461

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Research on Hot Deformation Behaviors of Discontinuously Reinforced Aluminum Composites

Bolü XIAO(

), Zhiye HUANG, Kai MA, Xingxing ZHANG, Zongyi MA

Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Cite this article:

Bolü XIAO, Zhiye HUANG, Kai MA, Xingxing ZHANG, Zongyi MA. Research on Hot Deformation Behaviors of Discontinuously Reinforced Aluminum Composites. Acta Metall Sin, 2019, 55(1): 59-72.

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Abstract

This paper describes the research progress in hot deformation behaviors of discontinuously reinforced aluminum (DRA) composite, including research method, deformation mechanism and hot workability. The reliability of constitutive equation and processing map for description of flowing behaviors and deformation mechanisms in the previous studies were discussed. Based on that, the strain rate and temperature sensitivities of flow stress were introduced to further identify the deformation mechanisms. Deformation characteristics and microstructures of the composites with different reinforcements were illustrated. Finally, the future researches of hot deformation of DRA composite are suggested.

Key words: metal matrix composite hot working constitutive equation processing map deformation mechanism

Received: 08 October 2018

ZTFLH:

TB333

Fund: Supported by National Key Research and Development Program of China (No.2017YFB0703104) and Joint Funds of National Natural Science Foundation of China (No.U1508216)

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	Bolü XIAO
	Zhiye HUANG
	Kai MA
	Xingxing ZHANG
	Zongyi MA

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https://www.ams.org.cn/EN/10.11900/0412.1961.2018.00461 OR https://www.ams.org.cn/EN/Y2019/V55/I1/59

Table 1 Comparison of the apparent activation energies (Q_a) of hot deformation for different discontinuously reinforced aluminum (DRA) composites^{[44,45,46,47,48,49]}

Fig.1 Comparison of Young's modulus varying with temperature between the empirical equations and the experimental data in Al alloys

Fig.2 3D power dissipation coefficient (η) maps of 2.0%CNT/2024Al (mass fraction) composite at temperatures of 200, 300 and 400 ℃ (a), strain rates of 0.001, 0.01 and 0.1 s^-1 (b)^[74]

Fig.3 Contour map of strain rate sensitivity index (m) (a) and processing map (b) for 14%SiCp/2014Al (volume fraction) composite at true strain of 0.8, grey area up right corner in (b) denotes flowing instability which resulted in damage of specimens at higher strain of 0.9 (c)^[9]

Fig.4 Contour maps of temperature sensitive index (s) for 14%SiCp/2014Al (volume fraction) composite at true strain of 0.8^[9]

Fig.5 EBSD image in shear deformation region of 17%SiCp/2009Al (volume fraction) composite compressed at 400 ℃ and 1 s^-1 (a), and 500 ℃ and 1 s^-1 (b) with ε =0.7 (Low angle boundaries 2°~15° are marked by red lines, high angle boundaries ≥15° are marked by black lines, SiC particles are shown by black)

Fig.6 TEM images in compressive deformation region of 17%SiCp/2009Al (volume fraction) composite compressed at 400 ℃ and 1 s^-1 (a), and 500 ℃ and 1 s^-1 (b) with ε =0.7 (DRX—dynamic recrystallization, SG—subgrain)

Fig.7 Morphologies of CNT in 1.5%CNT/2009Al (volume fraction) composite before (a) and after (b) rolling^[117]

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