The Effect of Hydrostatic Pressure on the Shrinkage of Cavities in Metals
The Effect of Hydrostatic Pressure on the Shrinkage of Cavities in Metals
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DOI：
10.1179/030634571790439757
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发表时间：
1971-01
期刊：
影响因子：
--
通讯作者：
W. Beeré;G. W. Greenwood
中科院分区：
文献类型：
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作者：
W. Beeré;G. W. Greenwood
镁、硬铜和无氧高电导率铜的样品（其中位于晶界上的空腔是通过蠕变引入的）随后在惰性气氛中在一定温度范围内以及大气压和更高压力下进行退火。当空腔仍然附着在晶界上时，退火时的密度下降率与三种材料的活化能相关，分别为(1.0±0.1)×105、(1.34±0.12)×105和(1.26±0.12)×105J/mol，并且这些值不会因高达30MN/m2的环境压力而显着改变。烧结速度与 时间和静水压力的影响与晶界自扩散的空腔闭合模型一致，该模型还可以考虑残余气体的影响。烧结模型是定量开发的，考虑到不同空腔尺寸的影响，并且可用于预测烧结速率，或者，在没有相关数据的情况下，可以估计晶界自扩散系数。
Specimens of magnesium, tough-pitch copper, and oxygen-free, high conductivity copper, in which cavities situated on grain boundaries had been introduced by creep, were subsequently annealed in an inert atmosphere over a range of temperatures and at atmospheric and higher pressures. The rate of density decrease on annealing, when cavities remained attached to grain boundaries, was associated with activation energies for the three materials of (1.0 ± 0.1) × 105, (1.34 ± 0.12) × 105, and (1.26 ± 0.12) × 105 J/mol, respectively, and these values were not significantly altered by environmental pressure up to 30 MN/m2 The decrease in sintering rate with time and the influence of hydrostatic pressure were consistent with a model of cavity closure by grain-boundary self-diffusion, which could also incorporate an effect of residual gas. The model of sintering was developed quantitatively, taking into account the effect of varying cavity size, and can be used to predict rates of sintering or, alternatively, to permit estimates of grain-boundary self-diffusion coefficients where data on these are not available.