期刊
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
卷 39, 期 6, 页码 686-695出版社
WILEY
DOI: 10.1111/ffe.12413
关键词
acoustic emission; aluminium 7050; digital image correlation; fatigue; multi-functional; shape memory alloy
A multi-functional aluminium alloy 7050 (AA7050) containing embedded Ni-Ti shape memory alloy particles to detect fatigue crack growth is proposed. The regions of intense strain near the tip of a growing fatigue crack cause nearby Ni-Ti particles to undergo a solid-state phase transformation from austenite to martensite, releasing a detectable acoustic emission signal that can be used to locate the crack in the monitored component. The AA7050/Ni-Ti composite was made by vacuum hot pressing Ni-Ti powder between rolled AA7050 plates. The effect of hot pressing temperature and subsequent heat treatments (solutionizing and peak ageing) on the Ni-Ti particles was studied. A successful proof-of-concept was demonstrated for AA7050 with embedded particles that emit a measureable and repeatable acoustic emission signal in the presence of a fatigue crack, allowing for quick diagnosis of fatigue crack damage in this material.
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