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

惠友, 中川; 輝人, 金谷; 吾朗, 伊藤; 智生, 細川; 雅, 谷本

doi:10.2464/jilm.53.104

J. Japan Inst. Light Metals

2003

DOI: 10.2464/jilm.53.104

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

中川惠友¹,

金谷輝人²,

伊藤吾朗³

et al.

Abstract: 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 li… Show more

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Cited by 4 publications

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Fatigue Crack Behavior Related to Aged Microstructure in an Al-4%Ge Alloy

惠友¹,

輝人²,

紀幸³

et al. 2006

J. Japan Inst. Metals

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Fatigue crack initiation and propagation have been investigated in relation to the aged microstructure in an Al 4Ge alloy by means of a fatigue test, microstructural characterization, and fractography. Specimens were solution treated at 693 K, quenched in iced water, kept at 273 K for 60 s, aged at 473 K for times up to 72 ks and then fatigue tested. It was confirmed that as the aging time increases, the tensile strength initially increases, reaches a maximum, and then decreases, while the fatigue strength monotonously decreases. Both in the interior and at the surface of the specimen, as the aging proceeded, the growth of precipitates inside the grain as well as on the grain boundary was observed while the width of precipitate free zones (PFZs) adjacent to the grain boundary was almost constant. Fractographic observations showed that intergranular fracture became predominant with increasing aging time and decreasing stress amplitude. From this result and close observations of the fatigue cracks initiation sites, the cracking was deduced to proceed in the following steps: 1) cracks initiate in the intergranular region of the specimen surface, 2) the cracks propagate along the intergranular region towards the interior of the specimen, 3) the crack path transits to the transgranular region because of the increase in true stress, 4) ductile fracture occurs with a marked reduction in area. The crack initiation was presumed to occur as a result of intrusion and extrusion formations along the soft PFZs that play a similar role to that of the persistent slip bands in most metallic materials.

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Fatigue Crack Behavior Related to Aged Microstructure in an Al-4%Ge Alloy

惠友¹,

輝人²,

紀幸³

et al. 2006

J. Japan Inst. Metals

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Effect of Electroless Ni-P Plating on the Mechanical Properties of Al-4%Ge Alloy

Nagata

Kanadani

Nakagawa

et al. 2015

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 Al 4Ge alloy was investigated. As the results, the following points were clarified. (1) Tensile strength of the specimen subjected to the Ni P plating after aging treatment or furnace cooling treatment was improved by about 10 in comparison to one of the non processed specimens. (2) Breaking elongation of the specimen subjected to the Ni P plating after aging treatment showed no significant changes in comparison to one of the non processed specimens. On the other hand, breaking elongation of the specimen subjected to Ni P plating after a furnace cooling treatment was reduced to 70 in comparison to one of the non processed specimens. (3) Fatigue strength of the specimen subjected to the Ni P plating after a furnace cooling treatment was overall reduced rather than one of non processed specimens. (4) Fatigue strength of the specimen subjected to the Ni P plating after aging treatment was overall reduced, except for the low stress region, rather than one of the non processed specimens. (5) In the specimen subjected to 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 non processed specimens.Especially, it is considered that the poor fatigue strength and ductility of the plating materials are mainly due to the interaction between the surface precipitates and hydrogen gas.

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Effect of Surface Layer and Hydrogen on the Fatigue Strength of an Al-4％Ge Alloy

Kanadani

Hino

Horikawa

et al. 2023

J. Japan Inst. Metals and Materials

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In this study, the effect of surface layer and hydrogen on the fatigue strength of Al-4％Ge alloy was investigated. As the results, the following points were clarified. (1) Tensile strength of the specimen subjected to the Ni-P plating after aging treatment or furnace cooling treatment was improved by about 10％ in comparison to one of the non-processed specimens. (2) Breaking elongation of the specimen subjected to the Ni-P plating after aging treatment showed no significant changes in comparison to one of the non-processed specimens. On the other hand, breaking elongation of the specimen subjected to Ni-P plating after a furnace cooling treatment was reduced to 70％ in comparison to one of the non-processed specimens. (3) Fatigue strength of the specimen subjected to the Ni-P plating after a furnace cooling treatment was overall reduced rather than one of non-processed specimens. (4) Fatigue strength of the specimen subjected to the Ni-P plating after aging treatment was overall reduced, except for the low-stress region, rather than one of the non-processed specimens. (5) In the specimen subjected to 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 non-processed specimens. Especially, it is considered that the poor fatigue strength and ductility of the plating materials are mainly due to the interaction between the surface precipitates and hydrogen gas.

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

Cited by 4 publications

References 7 publications

Fatigue Crack Behavior Related to Aged Microstructure in an Al-4%Ge Alloy

Fatigue Crack Behavior Related to Aged Microstructure in an Al-4%Ge Alloy

Effect of Electroless Ni-P Plating on the Mechanical Properties of Al-4%Ge Alloy

Effect of Surface Layer and Hydrogen on the Fatigue Strength of an Al-4％Ge Alloy

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