Cold spray is a promising solid-state additive manufacturing process for the fabrication of metal matrix composites in the forms of coatings, and more recently, bulk materials, particularly when deposition of two phases is needed with minimal alterations of the chemistry and phase composition. While prior studies have reported improved mechanical performance in cold sprayed composites, a fundamental understanding of the response and contribution of individual constituent phases to the collective mechanical properties of the composite is yet to be developed. In this work, we use in-situ synchrotron X-ray diffraction to study the strain partitioning between the soft and hard phases in cold sprayed Ni–CrC bulk composites. We conduct stepwise uniaxial tensile loading experiments and use high energy X-ray diffraction at multiple load steps to measure phase-specific strains and stresses upon loading. We find neither plasticity in the Ni phase nor a significant load transfer or redistribution between Ni and CrC phases during the loading process and attribute them to a premature failure governed by the presence of defects.

冷喷涂是一种很有前途的固态增材制造工艺，用于制造涂层形式的金属基复合材料，以及最近的散装材料，特别是当需要两相沉积时，化学和相组成的变化最小。虽然先前的研究报告了冷喷涂复合材料的机械性能有所提高，但对单个组成相对复合材料集体机械性能的响应和贡献的基本理解还有待开发。在这项工作中，我们使用原位同步加速器 X 射线衍射研究冷喷涂 Ni-CrC 块状复合材料中软相和硬相之间的应变分配。我们进行逐步单轴拉伸加载实验，并在多个加载步骤中使用高能 X 射线衍射来测量加载时的特定相应变和应力。我们在加载过程中既没有发现 Ni 相的可塑性，也没有发现 Ni 和 CrC 相之间的显着载荷转移或重新分布，并将它们归因于由缺陷的存在控制的过早失效。