THE EFFECT OF HYDROGEN ON SHORT FATIGUE-CRACK GROWTH IN AN AL-LI ALLOY

Citation
Er. Delosrios et al., THE EFFECT OF HYDROGEN ON SHORT FATIGUE-CRACK GROWTH IN AN AL-LI ALLOY, Fatigue & fracture of engineering materials & structures, 16(12), 1993, pp. 1299-1308
Citations number
11
Categorie Soggetti
Material Science","Engineering, Mechanical
ISSN journal
8756758X
Volume
16
Issue
12
Year of publication
1993
Pages
1299 - 1308
Database
ISI
SICI code
8756-758X(1993)16:12<1299:TEOHOS>2.0.ZU;2-F
Abstract
Experimental results are presented to illustrate the degree of suscept ibility to hydrogen embrittlement in an Al-Li 8090 alloy. The ductilit y of the alloy (as recorded in slow strain rate tests) is reduced by h ydrogen charging which induces microcrack formation on the surface of the hydrogen treated specimens. Results of fatigue tests show that sma ll fatigue cracks propagate 1.5 to 10 times faster in specimens charge d with hydrogen and fractographic evidence shows that short crack grow th in hydrogen precharged specimens is transgranular, along persistent slip bands. The effect of hydrogen is reversible, the embrittlement e ffect being eliminated by holding the specimens for 24 hr at 470-degre es-C.