Effect of multi-pass overlapping friction stir processing on fatigue behavior of Al-Cu alloy

被引：0

作者：

Satyanarayana, Marukurthi V. N. V. ^{[1
]}

Yanda, Sagar ^{[2
]}

Kranthi Kumar, Kethavath ^{[3
]}

Suresh, Bade Venkata ^{[4
]}

Venkatesh, Durga Janaki ^{[5
]}

Kolagotla, Rajani Kanthreddy ^{[6
]}

Gudaru, Kumar Raja ^{[7
]}

机构：

[1] Anil Neerukonda Inst Technol & Sci, Visakhapatnam 531162, Andhra Prades, India

[2] Aditya Inst Technol & Management, Tekkali 532203, Andhra Prades, India

[3] Jawaharlal Nehru Univ, Delhi 110067, India

[4] GMR Inst Technol, Rajam 532127, Andhra Prades, India

[5] Aditya Engn Coll, Surampalem 533291, Andhra Prades, India

[6] Freightliner Custom Chassis Corp, 552 Hayat St, Gaffney, SC 29651 USA

[7] Gayatri Vidya Parishad Coll Engn, Visakhapatnam 530048, Andhra Prades, India

来源：

PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART L-JOURNAL OF MATERIALS-DESIGN AND APPLICATIONS | 2025年 / 239卷 / 06期

关键词：

Fatigue crack growth rate; friction stir processing; grain refinement; precipitates; Al-Cu alloy; MICROSTRUCTURE;

D O I：

10.1177/14644207241276721

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

More than half of mechanical breakdowns stem from fatigue failure, often occurring suddenly and without warning. Friction stir processing (FSP) enhances the material's toughness and resilience to fatigue by refining its grain structure. This study investigates how multi-pass overlapping technique impacts the fatigue crack growth rate of FSPed Al-Cu alloy. Microstructural analysis revealed that the stir region exhibited uniformly dispersed and fragmented precipitates and finely recrystallized ultrafine grains. The hardness and strength were reduced, and ductility was enhanced after FSP due to high thermal cycling. Fatigue testing demonstrated a significant increase in fatigue life and reduced fatigue crack growth rate attributable to the combined effects of precipitation and grain refinement during cooling-assisted FSP. SEM examination of fatigue fracture surfaces revealed dimples indicative of ductile failure in the rapid crack propagation zone, while the steady-state propagation region displayed striation markings and secondary fractures.

引用

页码：1051 / 1062

页数：12

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