Structure change near grain boundaries resulting from aging-treatment and its effect on fatigue strength of an Al-1.2%Si alloy.

中川, 惠友; 金谷, 輝人; 細川, 智生; 谷本, 雅

doi:10.2464/jilm.50.650

J. Japan Inst. Light Metals

2000

DOI: 10.2464/jilm.50.650

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Structure change near grain boundaries resulting from aging-treatment and its effect on fatigue strength of an Al-1.2%Si alloy.

惠友中川¹,

輝人金谷²,

智生細川³

et al.

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Cited by 4 publications

References 9 publications

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Effect of Electroless Ni-P Plating on the Mechanical Properties of an Al-1.2%Si Alloy

Nagata¹,

Kanadani²,

Hiraoka³

et al. 2013

J. Japan Inst. Metals and Materials

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In this study, the effect of electroless Ni P plating on the mechanical properties of an Al 1.2Si alloy was investigated. As results, the following points were clarified. (1) Fatigue strength of the specimen subjected to zincate treatment only after furnace cooling treatment was almost the same as the furnace cooling only. (2) Fatigue strength of the specimen subjected to Ni P plating after furnace cooling treatment, was reduced overall, except for high stress region, rather than one of non processing materials. (3) Fatigue strength of the specimen subjected to Ni P plating after aging treatment showed a clear increase in comparison with one of non processing materials. (4) Tensile strength of the specimen subjected to Ni P plating after aging treatment or furnace cooling treatment was improved by about 10 in comparison with one of non processing materials. (5) Breaking elongation of the specimen subjected to Ni P plating after aging treatment showed no significant changes in comparison with one of non processing materials. On the other hand, breaking elongation of the specimen subjected to Ni P plating after furnace cooling treatment reduced by half in comparison with one of non processing materials. Especially, it seems that poor fatigue strength and ductility of plating materials are mainly caused due to interaction between surface precipitates and hydrogen gas.

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Effect of Electroless Ni-P Plating on the Mechanical Properties of an Al-1.2%Si Alloy

Nagata¹,

Kanadani²,

Hiraoka³

et al. 2013

J. Japan Inst. Metals and Materials

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Effect of Surface Structure and Hydrogen on the Fatigue Strength of Electroless Nickel-Phosphorus Plated Al-1.2%Si Alloy

Nagata¹,

Kanadani²,

Nakagawa³

et al. 2015

J.Japan Inst.Metals

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In this study, we examined the influence of surface precipitates and hydrogen gas on the fatigue strength of an electroless Ni P plated Al 1.2Si alloy.As the results, the following points were clarified.(1) Fatigue strength of the specimen subjected to zincate treatment only after a furnace cooling treatment was almost the same as only furnace cooling. (2) Fatigue strength of the specimen subjected to Ni P plating after a furnace cooling treatment was reduced overall, except for the high stress region, rather than one of the non processed materials. (3) Fatigue strength of the specimen subjected to Ni P plating after aging treatment showed a clear increase in comparison to one of the non processed materials. (4) In the specimens subjected to the Ni P plating after a furnace cooling treatment or aging treatment, clear hydrogen desorption was recognized. On the other hand, there was only hydrogen desorption from a few of the specimens subjected to zincate treatment after the furnace cooling treatment or only furnace cooling.It is considered that the poor fatigue strengths of the plating materials are mainly due to the interaction between the surface precipitates and hydrogen gas. [doi:10.2320/jinstmet.JC201412] (Received November 12, 2014; Accepted January 8, 2015; Published March 1, 2015) Keywords: aluminum silicon alloy, nickel phosphorus plating, fatigue strength, aging, surface precipitate, hydrogen gas

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Effect of microstructure on fatigue strength in an aged Al-4% Ge alloy.

惠友¹,

輝人²,

吾朗³

et al. 2003

J. Japan Inst. Light Metals

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EŠect of microstructure on fatigue strength in an aged Al 4Ge alloy Keiyu NAKAGAWA , Teruto KANADANI , Goroh ITHO  Norio HOSOKAWAand Tadashi TANIMOTO EŠects of aging at 473 K on the relationship between microstructure and fatigue strength for an Al 4Ge alloy has been investigated. The fatigue strength is lowered with increasing aging time. The fatigue life is deduced to be greatly aŠected by the initiation of the crack since the present fatigue test condition is in a high-cycle range. The crack is likely to initiate at the coarse precipitate located at the intersection between the free surface and grain boundary. This mechanism can explain the reduction in fatigue strength with increasing aging time, that is, with the increase in the size of the coarse precipitate.

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Structure change near grain boundaries resulting from aging-treatment and its effect on fatigue strength of an Al-1.2%Si alloy.

Cited by 4 publications

References 9 publications

Effect of Electroless Ni-P Plating on the Mechanical Properties of an Al-1.2%Si Alloy

Effect of Electroless Ni-P Plating on the Mechanical Properties of an Al-1.2%Si Alloy

Effect of Surface Structure and Hydrogen on the Fatigue Strength of Electroless Nickel-Phosphorus Plated Al-1.2%Si Alloy

Effect of microstructure on fatigue strength in an aged Al-4% Ge alloy.

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