Wear-resistant aluminum alloy extruded material exhibiting excellent fatigue strength and machinability

Abstract

A wear-resistant aluminum alloy extruded material that exhibits excellent fatigue strength and machinability is formed using an aluminum alloy that includes 3.0 to 8.0 mass % of Si, 0.1 to 0.5 mass % of Mg, 0.01 to 0.5 mass % of Cu, 0.1 to 0.5 mass % of Zr, 0.4 to 0.9 mass % of Fe, 0.01 to 0.5 mass % of Mn, 0.01 to 0.5 mass % of Cr, and 0.01 to 0.1 mass % of Ti, with the balance being Al and unavoidable impurities.

What is claimed is: 
     
         1 . A wear-resistant aluminum alloy extruded material that exhibits excellent fatigue strength and machinability, the aluminum alloy extruded material being formed using an aluminum alloy that comprises 3.0 to 8.0 mass % of Si, 0.1 to 0.5 mass % of Mg, 0.01 to 0.5 mass % of Cu, 0.1 to 0.5 mass % of Zr, 0.4 to 0.9 mass % of Fe, 0.01 to 0.5 mass % of Mn, 0.01 to 0.5 mass % of Cr, and 0.01 to 0.1 mass % of Ti, with the balance being Al and unavoidable impurities. 
     
     
         2 . The aluminum alloy extruded material according to  claim 1 , a metal structure of the extruded material having an average Si particle size of 20 μm or less. 
     
     
         3 . The aluminum alloy extruded material according to  claim 1 , the extruded material having an average crystal grain size of 30 μm or less. 
     
     
         4 . The aluminum alloy extruded material according to  claim 2 , the extruded material having an average crystal grain size of 30 μm or less.