Effect of TiB2 Content on Microstructure and Hardness of In Situ TiB2 Reinforced High Zinc Content Al-Zn-Mg-Cu-Zr Composite Materials

He Li; Li Hua Chai; Zi Yong Chen; Hai Jing Wang; Tou Nan Jin

doi:10.4028/www.scientific.net/MSF.894.34

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HomeMaterials Science ForumMaterials Science Forum Vol. 894Effect of TiB2 Content on Microstructure and...

Effect of TiB₂ Content on Microstructure and Hardness of In Situ TiB₂ Reinforced High Zinc Content Al-Zn-Mg-Cu-Zr Composite Materials

Abstract:

TiB₂p/Al-10Zn-1.7Mg-1.0Cu-0.12Zr composite was prepared by synthesis of in-situ Al-TiB₂ master alloy, high purity aluminum, pure zinc, pure magnesium, Al-50 wt% Cu and Al-4 wt% Zr master alloys. The mass fraction of TiB₂ particles was varied from 0% to 9.14%. SEM and TEM were applied to evaluate the microstructure and phase component. HB hardness test were carried out on hardness value of the matrix alloy and the composite. The results showed that TiB₂ particles uniformly distributed in the composite and well combined with the matrix alloy. The average grain size of the composites decreased from 110.35μm to 52.07μm when the TiB₂ particles is 4.47%, and the grain size changed slightly when TiB₂ content increased further. The hardness value of the composites which raised from 189HB to 206HB is superior to that of the matrix alloy. As the content of TiB₂ particles increased, HB hardness value also increased.

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Periodical:

Materials Science Forum (Volume 894)

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34-37

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.894.34

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Online since:

March 2017

Authors:

He Li*, Li Hua Chai, Zi Yong Chen, Hai Jing Wang, Tou Nan Jin

Keywords:

Aluminum Alloys, Composite, Hardness, TiB₂

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