Creep of Polycrystalline Magnesium Aluminate Spinel Studied by an SPS Apparatus

被引：18

作者：

Ratzker, Barak ^{[1
]}

Sokol, Maxim ^{[1
]}

Kalabukhov, Sergey ^{[1
]}

Frage, Nachum ^{[1
]}

机构：

[1] Ben Gurion Univ Negev, Dept Mat Engn, POB 653, IL-84105 Beer Sheva, Israel

来源：

MATERIALS | 2016年 / 9卷 / 06期

关键词：

creep; spinel; SPS; HIGH-TEMPERATURE DEFORMATION; SUPERPLASTIC DEFORMATION; CERAMICS; MECHANISM; FLOW;

D O I：

10.3390/ma9060493

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A spark plasma sintering (SPS) apparatus was used for the first time as an analytical testing tool for studying creep in ceramics at elevated temperatures. Compression creep experiments on a fine-grained (250 nm) polycrystalline magnesium aluminate spinel were successfully performed in the 1100-1200 degrees C temperature range, under an applied stress of 120-200 MPa. It was found that the stress exponent and activation energy depended on temperature and applied stress, respectively. The deformed samples were characterized by high resolution scanning electron microscope (HRSEM) and high resolution transmission electron microscope (HRTEM). The results indicate that the creep mechanism was related to grain boundary sliding, accommodated by dislocation slip and climb. The experimental results, extrapolated to higher temperatures and lower stresses, were in good agreement with data reported in the literature.

引用

页数：9

共 31 条

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