Experiments and Modeling of Fatigue Behavior of Friction Stir Welded Aluminum Lithium Alloy

被引：19

作者：

Cisko, Abby R. ^{[1
,2
]}

Jordon, James B. ^{[1
]}

Avery, Dustin Z. ^{[1
]}

Liu, Tian ^{[3
]}

Brewer, Luke N. ^{[3
]}

Allison, Paul G. ^{[1
]}

Carino, Ricolindo L. ^{[4
]}

Hammi, Youssef ^{[4
]}

Rushing, Timothy W. ^{[2
]}

Garcia, Lyan ^{[2
]}

机构：

[1] Univ Alabama, Dept Mech Engn, Tuscaloosa, AL 35487 USA

[2] US Army Engineer Res & Dev Ctr, Geotech & Struct Lab, Vicksburg, MS 39180 USA

[3] Univ Alabama, Dept Met & Mat Engn, Tuscaloosa, AL 35487 USA

[4] Mississippi State Univ, CAVS, Mississippi State, MS 39762 USA

来源：

METALS | 2019年 / 9卷 / 03期

关键词：

friction stir welding; aluminum lithium; aluminum lithium 2099; fatigue; fatigue modeling; strain controlled; CRACK-GROWTH-BEHAVIOR; AL-LI ALLOY; MECHANICAL-PROPERTIES; RESIDUAL-STRESS; MICROSTRUCTURE; JOINTS; PARAMETERS;

D O I：

10.3390/met9030293

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

An extensive experimental and computational investigation of the fatigue behavior of friction stir welding (FSW) of aluminum-lithium alloy (AA2099) is presented. In this study, friction stir butt welds were created by joining AA2099 using two different welding parameter sets. After FSW, microstructure characterization was carried out using microhardness testing, scanning electron microscopy, and transmission electron microscopy techniques. In particular, the metastable strengthening precipitates T-1 (Al2CuLi) and delta'(Al3Li) seen in the base metal were observed to coarsen and dissolve due to the FSW process. In order to evaluate the static and fatigue behavior of the FSW of the AA2099, monotonic tensile and fully-reversed strain-controlled fatigue testing were performed. Mechanical testing of the FSW specimens found a decrease in the ultimate tensile strength and fatigue life compared to the base metal. While the process parameters had an effect on the monotonic properties, no significant difference was observed in the number of cycles to failure between the FSW parameters explored in this study. Furthermore, post-mortem fractography analysis of the FSW specimens displayed crack deflection, transgranular fracture, and delamination failure features commonly observed in other parent Al-Li alloys. Lastly, a microstructurally-sensitive fatigue model was used to elucidate the influence of the FSW process on fatigue life based on variations in grain size, microhardness, and particle size in the AA2099 FSW.

引用

页数：20

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