High temperature damping in dispersion-strengthened aluminium alloys

被引：0

作者：

Pichler, A. ^{[1
]}

Weller, M. ^{[1
]}

Arzt, E. ^{[1
]}

机构：

[1] Inst fuer Werkstoffwissenschaft, Stuttgart, Germany

来源：

| 1600年 / Elsevier Science S.A., Lausanne, Switzerland卷 / 211-1期

关键词：

Anelastic relaxation - Damping - Dislocations (crystals) - Dispersion (waves) - Losses - Mathematical models - Mechanical variables measurement - Oscillations - Transmission electron microscopy;

D O I：

暂无

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学科分类号：

摘要：

Dispersion-strengthened alloys are promising candidates for application at high homologous temperatures. Mechanical loss measurements were carried out on a dispersion-strengthened Al alloy with about 10 vol.% of incoherent Al2O3 and Al4C3 particles. We observe a loss maximum at about 590 K for a frequency f = 1 Hz which exhibits an exceptionally high activation enthalpy (H = 2.2 eV) compared with that for self-diffusion (HD = 1.48 eV). The peak height increases with oscillation frequency. Additionally, transmission electron microscopy studies were carried out for a correlation of the loss spectrum with the microstructure. To explain the experimental results, a relaxation model is proposed which considers jog nucleation on climbing edge dislocations as the time-limiting mechanism.

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