Microstructure-property evolution of mechanically alloyed Al-20 wt% Si matrix powders and sintered composites reinforced withTiB2 particulates

Hasan Gökçe, M. Lütfi Öveçoğlu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Microstructural, physical and mechanical properties of Al–20 wt% Si matrix alloy powders and those reinforced with TiB2 and their sintered composites were investigated in relation to TiB2 content and mechanical alloying (MA) durations. Al–20 wt% Si matrix alloy powders and those containing 5 and 10 wt% TiB2 reinforcing particles were MA'd for 1, 2, 4, and 8 h followed by consolidation and sintering at 843 K. Si solubility in a-Al matrix increased with increasing MA duration. Increasing the TiB2 content, on the other hand, resulted in a systematic drop in Si solubility over the same MA period. Scanning electron micrographs of the sintered samples revealed sub-micron-sized, rod-shaped Si and spherical Al9Si phase particles. With increasing TiB2 content and MA durations, the microhardness of the Al20Si/TiB2 composites improved. The wear resistances of TiB2 reinforced composites better by 5 to 8 times than that of the as-blended and 1 h MA'd AlSi matrix alloy. Due to the presence of the Al3Ti intermetallic phase, sintered composite samples containing 10 wt% TiB2 particles MA'd for 8 h had the maximum hardness value and lower wear resistance values than those of the Al–20 wt% Si/5 wt% TiB2 composites.

Original languageEnglish
Article number101341
JournalEngineering Science and Technology, an International Journal
Volume39
DOIs
Publication statusPublished - Mar 2023

Bibliographical note

Publisher Copyright:
© 2023

Funding

The authors acknowledge the Scientific and Technological Research Council of Turkey (TÜBITAK) which provided funding to this research investigation (project number: 214M093). The authors would also like to express their gratitude to the members of the Particle Materials Laboratories (ITU-PML) for their assistance regarding some experimental work.

FundersFunder number
Türkiye Bilimsel ve Teknolojik Araştırma Kurumu214M093

    Keywords

    • Mechanical properties
    • Metal-matrix composites (MMCs)
    • Microstructural analysis
    • Powder processing
    • Si solubility in α-Al matrix
    • Sub-micron grains

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