On the origin of acoustic emission during room temperature compressive deformation of a γ-TiAl based alloy

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• 作者：Kauffmann ; Florian ; Bidlingmaier ; Thomas ; Dehm ; Gerhard ; Wanner ; Alexander ; Clemens ; Helmut
• 关键词：A. Titanium aluminides ; based on TiAl ; B. Plastic deformation mechanisms ; B. Twinning
• 刊名：Intermetallics
• 出版年：2000
• 出版时间：July, 2000
• 年：2000
• 卷：8
• 期：7
• 页码：823-830
• 全文大小：812 K

文摘

In this study a two-phase γ-TiAl based alloy with near gamma microstructure was deformed in uniaxial compression at room temperature. The deformation experiments were carried out at a strain rate of 2×10⁻⁴ s⁻¹. The acoustic emission during deformation was monitored continuously using a root mean square voltmeter. Different annealing experiments between deformation cycles combined with transmission electron microscopy investigations revealed the formation of mechanical twins as the decisive mechanism for the acoustic emission.