Title

Mechanical Properties And Fracture Mechanism Of Nanostructured Al-20 Wt% Si Alloy

Keywords

Al-20Si alloy; Extrusion; Nanostructure; Rapid solidification; Wear

Abstract

The effect of powder size on the microstructure, mechanical properties and fracture behavior was studied in gas atomized Al-20 wt% Si alloy powders and their extruded bars using SEM, XRD, TEM, tensile testing and wear testing. The microstructure of the extruded bars showed a homogeneous distribution of eutectic Si and primary Si particles embedded in the Al matrix. The grain size of α-Al varied from 150 to 600 nm and the size of the eutectic Si and primary Si in the extruded bars was about 100 - 200 nm. The tensile strength of the Al-20Si (powder size < 26 μm) alloys at room temperature was 322 MPa while for the Al-20Si (powder size: 45-106 μm) it was 230 MPa; this value is higher than that of Al-20Si-3Fe (powder size: 60-120 μm) alloys. With decreasing powder size from 45-106 μm to < 26 nm, the specific wear decreased significantly at all sliding speeds due to the fine nanostructute. The wear resistance was also better than that of the Al-20Si-3Fe alloys. The fracture mechanism of failure in tension testing and wear testing was also studied.

Publication Date

12-1-2003

Publication Title

Processing and Properties of Structural Nanomaterial: Proceedings of Symposia held at the Materials Science and Technology 2003 Meeting

Number of Pages

133-140

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

Socpus ID

1542538482 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/1542538482

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