Fatigue properties and microstructure of quasicrystalline AlFeCrTi alloy. (October 2016)

• Record Type: Journal Article
• Authors: Chlupova, Alice; Chlup, Zdenek; Kruml, Tomas
• Is Part Of: International journal of fatigue. Volume 91: Part 1(2016)
• Page Start: 251
• Page End: 256
• Publication Date: 2016-10
• Subjects: Aluminium alloy -- Quasicrystals -- Fatigue -- Fractography; Materials -- Fatigue -- Periodicals; Materials -- Fatigue; Periodicals; 620.1122
• DOI: 10.1016/j.ijfatigue.2016.06.007
• Languages: English
• ISSNs: 0142-1123

Abstract

Highlights: Bulk material reinforced by icosahedral phase was prepared via hot extrusion method. The finest material exhibited the highest tensile and fatigue strength. Values of fatigue strength are approx. 100 MPa higher than for commercial Al alloys. The weakest link fracture mechanism is operating and fish-eye formation was observed. Abstract: Aluminium based material having chemical composition of Al93 Fe3 Ti2 Cr2 (at.%) was prepared by hot extrusion of gas atomised powder. Microstructure consisting of aluminium matrix and icosahedral quasicrystalline particles was investigated by scanning and transmission electron microscopy a X-ray spectroscopy. Size, distribution and inner structure of quasicrystalline particles were determined. When quasicrystalline particles having submicron size were present in the microstructure together with fine-grained aluminium matrix, it resulted in enhancement of mechanical properties. Fatigue experiments were performed in load controlled regime with positive mean stress and fatigue life data for this quasicrystalline material were compared with similar results for commercially available aluminium alloys. Longer fatigue life together with higher fatigue strength reaching value of 350 MPa was observed. It is approx. 100 MPa higher than for commercially produced coarse-grained aluminium alloys. Fractographic observations revealed presence of fish eye fracture patterns and validity of weakest link fracture mechanism acting in this type of material under investigation.