کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10620358 | 988617 | 2011 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Microstructure and high-temperature deformation behavior of Al2O3-TiO2 obtained from ultra-high-pressure densification of metastable powders
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
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چکیده انگلیسی
Metastable alumina composite powders with 13 wt.% titania were produced by plasma spraying using liquid nitrogen quenched substrates. The material consisted of a mixture of Al2O3 in a distorted spinel structure and a large amount of amorphous phases. High-pressure-high-temperature sintering below the crystallization temperature of the amorphous phase yielded a crystalline/amorphous composite that was used for creep experiments. During heating to the desired testing temperature, crystallization occurred and an in situ composite composed of corundum and rutile was obtained. This material exhibited superior deformation behavior compared to conventionally processed alumina materials. Comparably low temperatures of 1100 °C could be utilized to achieve plastic deformation of the material under a pressure of 50 MPa. Coble grain boundary creep with n = 1 and a low activation energy for diffusion of 390 kJ molâ1 was assumed to be the deformation mechanism.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 59, Issue 20, December 2011, Pages 7592-7601
Journal: Acta Materialia - Volume 59, Issue 20, December 2011, Pages 7592-7601
نویسندگان
J. Suffner, T. Scherer, D. Wang, C. Fasel, L. Jaworska, H. Hahn,