High cycle fatigue and fatigue crack propagation behaviors of modified A7075-T73 alloy

Gwan Yeong Kim; Kyu Sik Kim; Joong Cheol Park; Shae K. Kim; Young Ok Yoon; Kee Ahn Lee

doi:10.3365/KJMM.2014.52.4.283

High cycle fatigue and fatigue crack propagation behaviors of modified A7075-T73 alloy

Gwan Yeong Kim, Kyu Sik Kim, Joong Cheol Park, Shae K. Kim, Young Ok Yoon, Kee Ahn Lee

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

The high cycle fatigue and fatigue crack propagation behaviors of the recently developed modified A7075-T73 alloy are investigated. This alloy is manufactured using Eco-Mg (including CaO) instead of a magnesium element. The alloy consists of an Al matrix, Al₂CuMg, MgZn₂, minute amounts of Ca phases and reduced Fe-based intermetallic or oxide. The modified A7075 alloy exhibits superior strengths (YS: 492 MPa, TS: 548 MPa) with a similar elongation (12.8%) compared with the conventional A7075. Furthermore, the high cycle fatigue properties are significantly improved (fatigue limit of 330 MPa at 10⁷ cycles) compared with those of the conventional alloys. The fatigue crack propagation rate of the modified A7075 is similar or somewhat lower (higher resistance) than those of the conventional alloys. The superior tensile and fatigue properties of the modified A7075-T73 alloy are primarily attributed to the grain size refinement, evenly distributed strengthening phases (MgZn₂ precipitates), and reduction of detrimental effects of the Feintermetallic phases and oxides.

Original language	English
Pages (from-to)	283-291
Number of pages	9
Journal	Journal of Korean Institute of Metals and Materials
Volume	52
Issue number	4
DOIs	https://doi.org/10.3365/KJMM.2014.52.4.283
State	Published - Apr 2014
Externally published	Yes

Keywords

Alloys
Extrusion
Fatigue
Modified A7075-T73
Scanning Electron Microscopy (SEM)

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10.3365/KJMM.2014.52.4.283

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title = "High cycle fatigue and fatigue crack propagation behaviors of modified A7075-T73 alloy",

abstract = "The high cycle fatigue and fatigue crack propagation behaviors of the recently developed modified A7075-T73 alloy are investigated. This alloy is manufactured using Eco-Mg (including CaO) instead of a magnesium element. The alloy consists of an Al matrix, Al2CuMg, MgZn2, minute amounts of Ca phases and reduced Fe-based intermetallic or oxide. The modified A7075 alloy exhibits superior strengths (YS: 492 MPa, TS: 548 MPa) with a similar elongation (12.8%) compared with the conventional A7075. Furthermore, the high cycle fatigue properties are significantly improved (fatigue limit of 330 MPa at 107 cycles) compared with those of the conventional alloys. The fatigue crack propagation rate of the modified A7075 is similar or somewhat lower (higher resistance) than those of the conventional alloys. The superior tensile and fatigue properties of the modified A7075-T73 alloy are primarily attributed to the grain size refinement, evenly distributed strengthening phases (MgZn2 precipitates), and reduction of detrimental effects of the Feintermetallic phases and oxides.",

keywords = "Alloys, Extrusion, Fatigue, Modified A7075-T73, Scanning Electron Microscopy (SEM)",

author = "Kim, {Gwan Yeong} and Kim, {Kyu Sik} and Park, {Joong Cheol} and Kim, {Shae K.} and Yoon, {Young Ok} and Lee, {Kee Ahn}",

year = "2014",

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doi = "10.3365/KJMM.2014.52.4.283",

language = "English",

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T1 - High cycle fatigue and fatigue crack propagation behaviors of modified A7075-T73 alloy

AU - Kim, Gwan Yeong

AU - Kim, Kyu Sik

AU - Park, Joong Cheol

AU - Kim, Shae K.

AU - Yoon, Young Ok

AU - Lee, Kee Ahn

PY - 2014/4

Y1 - 2014/4

N2 - The high cycle fatigue and fatigue crack propagation behaviors of the recently developed modified A7075-T73 alloy are investigated. This alloy is manufactured using Eco-Mg (including CaO) instead of a magnesium element. The alloy consists of an Al matrix, Al2CuMg, MgZn2, minute amounts of Ca phases and reduced Fe-based intermetallic or oxide. The modified A7075 alloy exhibits superior strengths (YS: 492 MPa, TS: 548 MPa) with a similar elongation (12.8%) compared with the conventional A7075. Furthermore, the high cycle fatigue properties are significantly improved (fatigue limit of 330 MPa at 107 cycles) compared with those of the conventional alloys. The fatigue crack propagation rate of the modified A7075 is similar or somewhat lower (higher resistance) than those of the conventional alloys. The superior tensile and fatigue properties of the modified A7075-T73 alloy are primarily attributed to the grain size refinement, evenly distributed strengthening phases (MgZn2 precipitates), and reduction of detrimental effects of the Feintermetallic phases and oxides.

AB - The high cycle fatigue and fatigue crack propagation behaviors of the recently developed modified A7075-T73 alloy are investigated. This alloy is manufactured using Eco-Mg (including CaO) instead of a magnesium element. The alloy consists of an Al matrix, Al2CuMg, MgZn2, minute amounts of Ca phases and reduced Fe-based intermetallic or oxide. The modified A7075 alloy exhibits superior strengths (YS: 492 MPa, TS: 548 MPa) with a similar elongation (12.8%) compared with the conventional A7075. Furthermore, the high cycle fatigue properties are significantly improved (fatigue limit of 330 MPa at 107 cycles) compared with those of the conventional alloys. The fatigue crack propagation rate of the modified A7075 is similar or somewhat lower (higher resistance) than those of the conventional alloys. The superior tensile and fatigue properties of the modified A7075-T73 alloy are primarily attributed to the grain size refinement, evenly distributed strengthening phases (MgZn2 precipitates), and reduction of detrimental effects of the Feintermetallic phases and oxides.

KW - Alloys

KW - Extrusion

KW - Fatigue

KW - Modified A7075-T73

KW - Scanning Electron Microscopy (SEM)

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JO - Journal of Korean Institute of Metals and Materials

JF - Journal of Korean Institute of Metals and Materials

IS - 4

ER -

High cycle fatigue and fatigue crack propagation behaviors of modified A7075-T73 alloy

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