Improved fatigue crack growth resistance by retrogression and re‐aging heat treatment in 7010 aluminum alloy

Nandana M.S.; Udaya Bhat K.; Manjunatha C.M.

doi:10.1111/ffe.12946

journal article·2019-03

Improved fatigue crack growth resistance by retrogression and re‐aging heat treatment in 7010 aluminum alloy

Nandana M.S., Udaya Bhat K., Manjunatha C.M.

Fatigue & Fracture of Engineering Materials & Structures· Volume 42· Issue 3

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Source abstract

Abstract

Abstract Aircraft grade 7010 aluminum alloy was heat treated to two different conditions: (1) standard peak aging (T6) and (2) retrogression and re‐aging (RRA). The microstructures of these alloys were characterized by using transmission electron microscope. Fatigue crack growth rate (FCGR) tests were conducted using standard compact tension specimens, following ASTM standards. Tests were conducted at various stress ratios, R ranging from 0.1 to 0.7. The RRA‐treated alloy was observed to contain coarsened η′ (MgZn₂) precipitates with higher inter‐particle spacing when compared with T6‐treated alloy. The grain boundary precipitates (GBPs) were also coarsened and discontinuous in RRA‐treated alloy as compared with continuous GBPs in T6 condition. The FCGR was lower and ΔK_thwas higher in RRA‐treated alloy compared with T6‐treated alloy at all the stress ratios investigated. Improved fatigue crack growth resistance in RRA‐treated alloy was correlated to the modified microstructure and enhanced crack closure levels.

Source: crossref · Quality: baseline

Research context

Metals & alloys Materials processing

OpenAlex topics: Aluminum Alloy Microstructure Properties · High Temperature Alloys and Creep · Fatigue and fracture mechanics

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Metallurgical and Materials Engineering National Institute of Technology Karnataka Surathkal, Mangalore 575025 India

Structural Technologies Division CSIR‐National Aerospace Laboratories Bangalore 560017 India

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