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      Fatigue crack paths and properties in A356-T6 aluminum alloy microstructurally modified by friction stir processing under different conditions

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          Abstract

          A356-T6 cast aluminum alloy is a light weight structural material, but fatigue crack initiates and propagates from a casting defect leading to final fracture. Thus it is important to eliminate casting defects. In this study, friction stir processing (FSP) was applied to A356-T6, in which rotating tool with probe and shoulder was plunged into the material and travels along the longitudinal direction to induce severe plastic deformation, resulting in the modification of microstructure. Two different processing conditions with low and high tool rotational speeds were tried and subsequently fully reversed fatigue tests were performed to investigate the effect of processing conditions on the crack initiation and propagation behavior. The fatigue strengths were successfully improved by both conditions due to the elimination of casting defects. But the lower tool rotational speed could further improve fatigue strength than the higher speed. EBSD analyses revealed that the higher tool rotational speed resulted in the severer texture having detrimental effects on fatigue crack initiation and propagation resistances.

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          Most cited references 3

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          Fatigue behavior of A356-T6 aluminum cast alloys. Part I. Effect of casting defects

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            Microstructural evolution and mechanical properties of friction-stir-welded Al-Mg-Si joint

             T Morita,  M. Yamanaka (2014)
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              Notch fatigue behaviour in a Sb-modified permanent-mold cast A356-T6 aluminium alloy

               Keiro Tokaji (2005)
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                Author and article information

                Affiliations
                [1 ] Murata Machinery, Ltd., Japan
                [2 ] Gifu University, Japan
                [3 ] Okuma Corp., Japan
                Journal
                Frattura ed Integrità Strutturale
                Gruppo Italiano Frattura
                01 October 2015
                : 9
                : 34
                : 347-354
                260c17f941eb4d81bb38f8205327a633

                This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

                Categories
                Technology
                T
                Electrical engineering. Electronics. Nuclear engineering
                TK1-9971
                Materials of engineering and construction. Mechanics of materials
                TA401-492

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