Preparation and Performance of a Novel Al-alloy Based Composite 7075-TiB2

doi:10.11901/1005.3093.2024.444

Chinese Journal of Materials Research

2025, Vol. 39

Issue (9): 683-693 DOI: 10.11901/1005.3093.2024.444

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Preparation and Performance of a Novel Al-alloy Based Composite 7075-TiB₂

XIE Fangxia¹^,²(

), WU Guangqing¹, ZHANG Shiwen³, LU Zeyi¹, MU Yanming¹^,², HE Xueming¹^,²

^1.School of Mechanical Engineering, Jiangnan University, Wuxi 214122, China
^2.Key Laboratory of Advanced Food Manufacturing Equipment and Technology, Wuxi 214122, China
^3.Wuxi Xizuan Geological Drilling Equipment Co., Ltd., Wuxi 214413, China

Cite this article:

XIE Fangxia, WU Guangqing, ZHANG Shiwen, LU Zeyi, MU Yanming, HE Xueming. Preparation and Performance of a Novel Al-alloy Based Composite 7075-TiB₂. Chinese Journal of Materials Research, 2025, 39(9): 683-693.

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Abstract

Al-alloy 7075 based composites 7075-xTiB₂ (x = 0%, 3%, 6%, 9%, 12%, 15%, mass fraction) were prepared by hot pressing sintering. The effect of TiB₂ particle content and the post solution treatment temperatures on the microstructure and mechanical properties of the composites were studied. The results show that by hot press sintering at 600 ^oC, the density of 7075-6%TiB₂ composites can reach 98.17%; TiB₂ particles could effectively inhibit the growth of α-Al, and the average grain size of 7075-6%TiB₂ composite was significantly refined, decreasing from 57.53 μm to 38.12 μm; TiB₂ particles are mainly located at the grain boundaries, which hinder the diffusion of solute atoms, slow down their diffusion rate, and inhibit the growth of η(MgZn₂) and S(Al₂CuMg) phases at the grain boundaries; Correspondingly, the mechanical properties of the hot-press sintered 7075-6%TiB₂ composite reached the peak, and the yield strength and tensile strength were (205 ± 5) MPa and (338 ± 6) MPa, respectively, due to the joint action of fine crystal strengthening and dispersion strengthening. With the increase of solution temperature within the range 460-520 ^oC, the yield strength and tensile strength of hot-pressed 7075-6%TiB₂ composites first increase and then decrease. When the solution temperature is 500 ^oC, more small strengthening phases (η, S) are precipitated inside the composite matrix, and the dispersion strengthening effect is significant. Compared with the as hot-pressed 7075-6%TiB₂ composite, the yield strength and tensile strength are increased by 39.5% and 25.4%. It should be also mentioned that the composite 7075-6%TiB₂ being subjected to solution treated at 500 ^oC showed better mechanical properties than those of 7075 Al-alloy.

Key words: composite 7075-6%TiB₂ hot pressing sintering mechanical properties solution temperature

Received: 01 November 2024

ZTFLH:

TB333

Fund: National Natural Science Foundation of China(51501073);National Natural Science Foundation of China(51975251);National Natural Science Foundation of China(52205056);China Postdoctoral Science Foundation(2023M731424)

Corresponding Authors: XIE Fangxia, Tel: (0510)85910562, E-mail: xiefangxia@jiangnan.edu.cn

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	XIE Fangxia
	WU Guangqing
	ZHANG Shiwen
	LU Zeyi
	MU Yanming
	HE Xueming

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https://www.cjmr.org/EN/10.11901/1005.3093.2024.444 OR https://www.cjmr.org/EN/Y2025/V39/I9/683

Fig.1 Density curves of 7075-xTiB₂ (x = 0%, 3%, 6%, 9%, 12%, 15%) composites in different hot pressing sintering temperatures

Fig.2 XRD patterns of hot-pressed 7075-xTiB₂ (x = 0%, 3%, 6%, 9%, 12%, 15%) composites (a) and local magnification images of box selection parts of 1 (b) and 2 (c)

Fig.3 SEM images of hot pressed 7075-xTiB₂ composites (a) x = 0%, (b) x = 3%, (c) x = 6%, (d) x = 9%, (e) x = 12%, (f) x = 15%

Fig.4 Histograms of grain size distribution in hot pressed 7075-xTiB₂ composites (a) x = 0%, (b) x = 3%, (c) x = 6%, (d) x = 9%, (e) x = 12%, (f) x = 15%

Fig.5 SEM (a, b) and Al (c), Ti (d), Mg (e), Cu (f), Zn (g), B (h) element distribution of hot-pressed 7075-6%TiB₂ composites and EDS analysis of point A in Fig.5b (i)

Fig.6 Tensile stress-strain curves (a) and mechanical properties (b) of hot-pressed 7075-xTiB₂ (x = 0%, 3%, 6%, 9%, 12%, 15%) composites

Fig.7 Fracture morphologies of hot-pressed 7075-xTiB₂ composites (a) x = 0%, (b) x = 3%, (c) x = 6%, (d) x = 9%, (e) x = 12%, (f) x = 15%

Fig.8 XRD patterns of 7075-6%TiB₂ composite at different solution temperatures (a) and local magnification of box selection parts of 1 (b) and 2 (c)

Fig.9 SEM images of 7075-6%TiB₂ composite at solution temperature of 460 ^oC (a, b), 480 ^oC (d, e), 500 ^oC (g, h), 520 ^oC (j, k) and EDS analysis of points B (c), C (f), D (i), E (l)

Fig.10 Tensile stress-strain curves (a) and mechanical properties (b) of 7075-6%TiB₂ composite at different solution temperatures

Fig.11 Fracture morphologies of 7075-6%TiB₂ composite at different solution temperatures (a) 460 ^oC, (b) 480 ^oC, (c) 500 ^oC, (d) 520 ^oC

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