Evolution of Primary and Eutectic Si Phase and Mechanical Properties of Al2O3/Al-20Si Composites under High Pressure

Wang, Xiaohong; Chen, Zhipeng; Ma, Tengfei; Zhu, Dongdong; Dong, Duo; Yang, Xiaohong; Liu, Li; Wang, Gang

doi:10.3390/cryst11040364

Open AccessArticle

Evolution of Primary and Eutectic Si Phase and Mechanical Properties of Al₂O₃/Al-20Si Composites under High Pressure

by

Xiaohong Wang

^1,*

,

Zhipeng Chen

^1,2,

Tengfei Ma

¹,

Dongdong Zhu

^1,*,

Duo Dong

^1,*,

Xiaohong Yang

³,

Li Liu

¹ and

Gang Wang

²

¹

Key Laboratory of Air-Driven Equipment Technology of Zhejiang Province, Quzhou University, Quzhou 324000, China

²

School of Mechanical and Automotive Engineering, Anhui Polytechnic University, Wuhu 241000, China

³

School of Mechanical and Electrical Engineering, Jinhua Polytechnic, Jinhua 321017, China

^*

Authors to whom correspondence should be addressed.

Crystals 2021, 11(4), 364; https://doi.org/10.3390/cryst11040364

Submission received: 11 March 2021 / Revised: 22 March 2021 / Accepted: 26 March 2021 / Published: 30 March 2021

(This article belongs to the Section Hybrid and Composite Crystalline Materials)

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Abstract

To further improve the mechanical properties of Al-Si alloys. The phase, microstructure and mechanical properties of Al₂O₃/Al-20Si composites under different pressures were studied. The results show that the phase of Al₂O₃/Al-20Si composites are composed of α-Al phase, β-Si phase and Al₂O₃. Under the condition of hot-pressing sintering (0.02 GPa), a large number of Si phases with irregular shape and sharp angle are distributed on the α-Al matrix. Under high pressure solidification, the growth of primary Si phase is inhibited and the eutectic Si is spheroidized obviously. The microhardness of Al₂O₃/Al-20Si composite increases from 102.5 HV_0.05 at 0.02 GPa to 156.4 HV_0.05 at 4 GPa, which increases by 52.6%. The compressive strength increased from 381.5 MPa at 0.02 GPa to 469.1 MPa at 4 GPa, increasing by 23%. With the increase of solidification pressure, the fracture mechanism changes from cleavage fracture to quasi cleavage fracture.

Keywords: composite; phase transformation; Si; microstructure; stress/strain relationship

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MDPI and ACS Style

Wang, X.; Chen, Z.; Ma, T.; Zhu, D.; Dong, D.; Yang, X.; Liu, L.; Wang, G. Evolution of Primary and Eutectic Si Phase and Mechanical Properties of Al₂O₃/Al-20Si Composites under High Pressure. Crystals 2021, 11, 364. https://doi.org/10.3390/cryst11040364

AMA Style

Wang X, Chen Z, Ma T, Zhu D, Dong D, Yang X, Liu L, Wang G. Evolution of Primary and Eutectic Si Phase and Mechanical Properties of Al₂O₃/Al-20Si Composites under High Pressure. Crystals. 2021; 11(4):364. https://doi.org/10.3390/cryst11040364

Chicago/Turabian Style

Wang, Xiaohong, Zhipeng Chen, Tengfei Ma, Dongdong Zhu, Duo Dong, Xiaohong Yang, Li Liu, and Gang Wang. 2021. "Evolution of Primary and Eutectic Si Phase and Mechanical Properties of Al₂O₃/Al-20Si Composites under High Pressure" Crystals 11, no. 4: 364. https://doi.org/10.3390/cryst11040364

APA Style

Wang, X., Chen, Z., Ma, T., Zhu, D., Dong, D., Yang, X., Liu, L., & Wang, G. (2021). Evolution of Primary and Eutectic Si Phase and Mechanical Properties of Al₂O₃/Al-20Si Composites under High Pressure. Crystals, 11(4), 364. https://doi.org/10.3390/cryst11040364

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Evolution of Primary and Eutectic Si Phase and Mechanical Properties of Al₂O₃/Al-20Si Composites under High Pressure

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