Microstructure and Properties of In Situ Fabricated Al-5wt.%Si-Al₂O₃ Composites

Abstract:

Alumina reinforced aluminum matrix composites (Al-5wt.%Si-Al₂O₃) fabricated by powder metallurgy through hot isotactic pressing were sintered in different processes, i.e. solid and liquid phase sintering. Optical microscopy (OM), X-ray diffraction (XRD), scanning electron microscope (SEM), Energy Dispersive X-ray (EDX) techniques were used to characterize the sintered composites. The effects of solid phase and liquid phase sintering on density, microstructure, microhardness, compression and shear strength were investigated. It was found that in situ chemical reaction was completed in solid phase sintering, but the composites had lower microhardness, comprehension and shear strength due to low density and segregation of alumina and Si particles in microstructure. Segregation of reinforcement particles in solid phase sintering resulted from character of solid reaction and Si diffusion at high temperature over a long hold time.

• Periodical: Advanced Materials Research (Volume 567)
• Pages: 15-20
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.567.15
• Online since: September 2012
• Authors: Ling Cheng, De Gui Zhu, Ying Gao, Wei Li, Bo Wang
• Keywords: Al-5wt.%Si-Al₂O₃, In Situ Fabrication, Liquid Phase Sintering (LPS), Microstructure, Property, Solid Phase Sintering

References

[1] G. O'Donnell, L. Looney: Materials Science and Engineering A Vol. 303 (2001), p.292.

[2] Majid Hoseini, Mahmood Mertian: Materials letters. Vol. 59 (2005), p.3414.

[3] J.M. Torralba, C.E. da Costa and F. Velasco: Journal of Materials Processing Technology Vol. 133 (2003), p.203.

[4] Zhao Yu-tao, Zhang Song-li and Chen Gang: Transaction of Nononferrous Metals Society of China Vol. 20 (2010), p.2129.

[5] Hailong Wang, Rui Zhang, Xing Hu, Chang-An Wang and Yong Huang: Journal of materials processing technology Vol. 197 (2008), p.43.

[6] Majid Hoseini, Mahmood Meratian: Journal of Alloys and Compounds Vol. 471 (2009), p.378.

[7] Chen Guo-qin, Xiu Zi-yang, Yang Wen-shu, Jiang Long-tao and Wu Gao-hui: Transaction of Nonferrous Metals Society of China Vol. 20 (2010), p.2143.

[8] X. X Yu, W.B. Lee: Composites Part A: applied science and manufacturing Vol. 31(2000), p.245.

[9] G. Abouelmagd: Journal of Materials Processing Technology Vol. 155-156 (2004), p.1395.

[10] Hongming Wang, Guirong Li, Yutao Zhao and Gang Chen: Materials Science and Engineering A Vol. 527 (2010), p.2881.

[11] Ying Gao, Degui Zhu, Ling Cheng, Hongliang Sun and Qing Wang: Advanced Materials Research Vol. 283-286 (2011), p.38.

[12] In Jun Hwang, Duck Young Hwang, Yong Min Kim, Bongyoung Yoo and Dong Hyuk Shin. Journal of Alloys and Compounds Vol. 5045 (2010), p.527.

[13] Liu Zheng, Zhu Yinglu, Chen Cigao and Liu Xiaomei: [J] Mining & Metallurgy. Vol. 4 (1996), p.60 (in Chinese).

[14] Liu Zheng, Liu Xiao-mei: Mining & Metallurgy. Vol. 9 (2000), p.74 (in Chinese).

[15] Jian Zengyun, Yang Genchang and Zhou yaohe. The Chinese Journal of Nonferrous Metals [J] Vol. 5 (1995), p.133 (in Chinese).

[16] Zhang Zhiqing, Li Qiulin, Chen Dandan, Liu Wei and Liu Qing: Rare Metal Materials and Engineering. Vol. 40 (2011), p.322 (in Chinese).

[17] Randall M. German, Pavan Suri and Seong Jin Park: J Materials Science Vol. 44 (2009), p.1.