High-pressure x-ray diffraction on Ni₃Al, non-hydrostatically compressed at room temperature to 30 GPa in radial geometry can be interpreted in terms of a hydrostatic pressure–volume equation of state. We found the yield strength of Ni₃Al to increase from about 0.2 to 2 GPa as pressure increases from 0 to 30 GPa. Yield-strength values determined from x-ray diffraction in axial geometry by including a Poisson ratio effect and pressure gradient methods are in good accord with each other. Our results indicate that the strengths of both pure and Cr-doped (7 at. %) Ni₃Al increase with pressure, with the yield strength of Ni₃Al slightly higher than Ni-Al-Cr alloy.

在Ni ₃ Al上进行的高压x射线衍射，在室温下以径向静力学压缩至30 GPa，径向几何形状可以用静水压力-体积状态方程来解释。我们发现，当压力从0 GPa增加到30 GPa时，Ni ₃ Al的屈服强度从约0.2 GPa增加到2 GPa。通过包括泊松比效应和压力梯度法的轴向几何学中的X射线衍射确定的屈服强度值彼此非常吻合。我们的结果表明（原子％7）的Ni都纯和Cr掺杂的长处₃与压力的Al的增加，用Ni的屈服强度₃的Al除Ni的Al-Cr合金略高。