Aging Behavior of Nano-SiC/2014Al Composite Fabricated by Powder Metallurgy and Hot Extrusion Techniques

doi:10.1016/j.jmst.2016.07.011

Abstract

Abstract:

The aging-hardening kinetics of powder metallurgy processed 2014Al alloy and its composite have been studied. The existence of n-SiC particulates leads to the increase of peak hardness. Interestingly, the aging-hardening peak of the composite takes place at earlier time than that of the unreinforced alloy. Transmission electron microscopy (TEM) studies indicated that the major precipitation phases are Al₅Cu₂Mn₃ and θ′ (Al₂Cu). Besides, Ω phase appeared in both specimens at peak hardening condition, which has been rarely observed previously in aluminum metal matrix composites without Ag. Accelerated aging kinetics and increased peak hardness may be attributed to the higher dislocation density resulted from the mismatch of coefficients of thermal expansion between n-SiC and 2014Al matrix. The results are beneficial to fabricating high performance composites for the application in automobile field such as pistons, driveshaft tubes, brake rotors, bicycle frames, railroad brakes.

Key words: Metal matrix composites, Nano-SiC, Powder metallurgy, Hot extrusion, Aging hardening

Wang Zhiguo,Li Chuanpeng,Wang Huiyuan,Zhu Xian,Wu Min,Li Jiehua,Jiang Qichuan. Aging Behavior of Nano-SiC/2014Al Composite Fabricated by Powder Metallurgy and Hot Extrusion Techniques[J]. J. Mater. Sci. Technol., 2016, 32(10): 1008-1012.

Figures/Tables 8

Table 1 Chemical compositions of the matrix (in wt%)

Table 1 Chemical compositions of the matrix (in wt%)">

Cu	Si	Mg	Mn	Fe	Al
4.0	0.8	0.5	0.8	0.7	Balance

Fig. 1. DSC curves of 2014Al and 0.5 vol.% n-SiC/2014Al composite.

Fig. 2. Aging-hardening curves of 2014Al and 0.5 vol.% n-SiC/2014Al composite.

Table 2 Summary of hardness and aging behavior of matrix and composite

Fig. 3. TEM bright field images of Al5Cu2Mn3 precipitates in (a) 2014Al alloy, (b) 0.5 vol.% n-SiCp/2014Al aged at 160 °C for 1 h and corresponding (c) EDX and (d) SAED in (b).

Fig. 4. TEM bright field images of (a) Al5Cu2Mn3 in 2014Al alloy, (b) θ′ precipitates in 2014Al alloy, (c) Al5Cu2Mn3 in 0.5 vol.% n-SiCp/2014Al composite and (d) θ′ precipitates in 0.5 vol.% n-SiCp/2014Al composite at peak hardness.

Fig. 5. TEM bright field image of (a) Ω (Al2Cu) and T (Al20Cu2Mn3), (b) σ (Al5Cu6Mg2) and the corresponding HRTEM images of (c) Ω (Al2Cu), (d) T (Al20Cu2Mn3) and (e) σ (Al5Cu6Mg2) precipitates.

Table 3 Summary of size of precipitates in 2014Al alloy and n-SiCp/2014Al composite

Materials	Precipitate	Size (1 h)	Size (peak hardness)	Size (24 h)
2014Al	Al₅Cu₂Mn₃	~200 nm	~210 nm	~250 nm
2014Al	θ′	—	~37 nm	~80 nm
n-SiC/2014Al	Al₅Cu₂Mn₃	~130 nm	~135 nm	~210 nm
n-SiC/2014Al	θ′	—	~33 nm	~60 nm

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