Embedded Ni–Ti particles for the detection of fatigue crack growth in AA7050
Embedded Ni–Ti particles for the detection of fatigue crack growth in AA7050
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用于检测 AA7050 中疲劳裂纹扩展的嵌入 Ni-Ti 颗粒
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
F. Yuan
中科院分区：
文献类型：
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作者：
W. Leser;J. Newman;J. Hochhalter;V. Gupta;F. Yuan
提出了一种含Ni-Ti形状记忆合金颗粒的多功能铝合金7050（AA 7050），用于检测疲劳裂纹扩展。在增长的疲劳裂纹尖端附近的强应变区域导致附近的Ni-Ti颗粒经历从奥氏体到马氏体的固态相变，释放可检测的声发射信号，该信号可用于定位被监测部件中的裂纹。将Ni-Ti粉末在轧制的AA 7050板材之间真空热压，制备了AA 7050/Ni-Ti复合材料。研究了热压温度和后续热处理（固溶和峰值时效）对Ni-Ti颗粒的影响。一个成功的概念验证被证明为AA 7050与嵌入的颗粒，发出可测量和可重复的声发射信号，在疲劳裂纹的存在，允许快速诊断疲劳裂纹损伤在这种材料。
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.