Title

Mechanical Properties And Fracture Behavior Of An Ultrafine-Grained Al-20 Wt Pct Si Alloy

Abstract

The effect of powder particle size on the microstructure, mechanical properties, and fracture behavior of Al-20 wt pct Si alloy powders was studied in both the gas-atomized and extruded conditions. The microstructure of the as-atomized powders consisted of fine Si particles and that of the extruded bars showed a homogeneous distribution of fine eutectic Si and primary Si particles embedded in the Al matrix. The grain size of fcc-Al varied from 150 to 600 nm and the size of the eutectic Si and primary Si was about 100 to 200 nm in the extruded bars. The room-temperature tensile strength of the alloy with a powder size <26 μm was 322 MPa, while for the coarser powder (45 to 106 μm), it was 230 MPa. The tensile strength of the extruded bar from the fine powder (<26 μm) was also higher than that of the Al-20 wt pct Si-3 wt pet Fe (powder size: 60 to 120 μm) alloys. With decreasing powder size from 45 to 106 μm to <26 μm, the specific wear of all the alloys decreased significantly at all sliding speeds due to the higher strength achieved by ultrafine-grained constituent phases. The thickness of the deformed layer of the alloy from the coarse powder (10 μm at 3.5 m/s) was larger on the worm surface in comparison to the bars from the fine powders (5 μm at 3.5 m/s), attributed to the lower strength of the bars with coarse powders. © ASM International & TMS-The Minerals Metals and Materials Society 2005.

Publication Date

12-1-2005

Publication Title

Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science

Volume

36

Issue

13

Number of Pages

715-723

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1007/s11661-005-1003-5

Socpus ID

60049099656 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/60049099656

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