The Effect of Silicide Volume Fraction on the Creep Behavior of Nb-Silicide Based In-Situ Composites
The Effect of Silicide Volume Fraction on the Creep Behavior of Nb-Silicide Based In-Situ Composites
复制标题
硅化物体积分数对铌硅化物基原位复合材料蠕变行为的影响
DOI：
10.1557/proc-646-n2.7.1
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
M. R. Jackson
中科院分区：
文献类型：
--
作者：
B. Bewlay;C. Briant;A. W. Davis;M. R. Jackson
本文研究了以Nb-Hf-Ti-Si四元合金为基体的高温Nb-硅化物自生复合材料的蠕变行为。硅化物的体积分数对蠕变行为的影响，以及Hf和Ti添加剂的影响，将被描述。复合材料在高达1200°C的温度和70至280 MPa的应力水平下进行压缩测试。在高（Nb）相体积分数下，蠕变行为由（Nb）的变形控制，并且随着硅化物的体积分数增加，蠕变速率降低。然而，在大的硅化物体积分数（>0.7）下，硅化物中的损伤开始降低蠕变性能。蠕变速率在硅化物的体积分数为0.06时有一个最小值。还将讨论单片和硅化物相的蠕变性能。
This paper will describe the creep behavior of high-temperature Nb-silicide in-situ composites based on quaternary Nb-Hf-Ti-Si alloys. The effect of volume fraction of silicide on creep behavior, and the effects of Hf and Ti additions, will be described. The composites were tested in compression at temperatures up to 1200°C and stress levels in the range 70 to 280 MPa. At high (Nb) phase volume fractions the creep behavior is controlled by deformation of the (Nb) and, as the volume fraction of silicide is increased, the creep rate is reduced. However, at large silicide volume fractions (>0.7) damage in the silicide begins to degrade the creep performance. The creep rate has a minimum at a volume fraction of ∼0.6 silicide. The creep performance of the monolithic and silicide phases will also be discussed.