Sound velocity variation behind a shock wave front is measured in pressed samples of micro- and nanodispersed mixtures of nickel and aluminum powders at pressures of 10, 30, and 60 GPa in order to verify the possibility of a reaction with the formation of nickel aluminide in a submicrosecond time range. It is shown that, in a pressure range of up to 60 GPa, the sound velocity in the samples from a nanodispersed mixture is higher than in the samples from a mi-crodispersed mixture. Moreover, upon reaching 60 GPa, the sound velocities in both mixtures with account for errors are practically equalized, which is related to melting of the samples. Based on the data obtained, it is concluded that there is no noticeable progress of the Ni + Al reaction during less than 1 μs.

中文翻译：

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来自微分散和纳米分散镍和铝粉混合物的冲击压缩样品中的声速

在 10、30 和 60 GPa 的压力下，在镍和铝粉的微米和纳米分散混合物的压制样品中测量冲击波前的声速变化，以验证与铝化镍形成反应的可能性。亚微秒的时间范围。结果表明，在高达 60 GPa 的压力范围内，纳米分散混合物样品中的声速高于微分散混合物样品中的声速。此外，在达到 60 GPa 时，考虑到误差的两种混合物的声速实际上是相等的，这与样品的熔化有关。根据获得的数据，可以得出结论，在不到 1 μs 的时间内，Ni + Al 反应没有明显的进展。