High Cycle Fatigue and Fatigue Crack Propagation Behaviors of Modified A7075-T73 Alloy

被引：8

作者：

Kim, Gwan Yeong ^{[1
]}

Kim, Kyu Sik ^{[1
]}

Park, Joong Cheol ^{[2
]}

Kim, Shae K. ^{[3
]}

Yoon, Young Ok ^{[3
]}

Lee, Kee-Ahn ^{[1
]}

机构：

[1] Andong Natl Univ, Sch Adv Mat Engn, Andong 760749, South Korea

[2] Res Inst Ind Sci & Technol, Pohang 790330, South Korea

[3] Korea Inst Ind Technol, Inchon 406840, South Korea

来源：

KOREAN JOURNAL OF METALS AND MATERIALS | 2014年 / 52卷 / 04期

关键词：

Alloys; Modified A7075-T73; Extrusion; Fatigue; Scanning Electron Microscopy (SEM); MECHANICAL-PROPERTIES; ALUMINUM-ALLOYS; MICROSTRUCTURE; GROWTH; SHEET;

D O I：

10.3365/KJMM.2014.52.4.283

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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 10(7) 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.

引用

页码：283 / 291

页数：9

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