Plasticity of Metal-Organic Framework Glasses

Metal-organic framework (MOF) glasses provide new perspectives on many material properties due to their unique chemical and structural nature. Their mechanical properties are of particular interest because glasses are inherently brittle, which limits their applications as structural materials. Here we perform strain-rate-dependent uniaxial micropillar compression experiments on a(g)ZIF-62, a(g)ZIF-UC-5, and a(g)TIF-4, a series of MOF glasses with different substituting linker molecules, and find that these glasses show substantial plasticity, at least on the micrometer scale. At a quasi-static strain rate of 0.001 s(-1), the micropillars yielded at approximately 0.32 GPa and subsequently deformed plastically up to 35% strain, irrespective of the type of substituting linker. With increasing strain rate, the yield strength of a(g)ZIF-62 evolved with the strain-rate sensitivity m = 0.024 to reach a yield strength of 0.44 GPa at a strain rate of 510 s(-1). On the basis of this relatively low strain-rate sensitivity and the absence of serrated flow, we conclude that structural densification is the predominant mechanism that accommodates such extensive plasticity.

Automated summary

Metal-organic framework (MOF) glasses exhibit significant plasticity in uniaxial micropillar compression experiments. The yield strength of the material evolves with increasing strain rate, with structural densification identified as the predominant mechanism for accommodating plasticity in these glasses.