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Composites with negative stiffness constituents can exhibit material properties that exceed conventional bounds. Composites with VO 2 as negative stiffness inclusions and tin as the stabilizing matrix were prepared via powder metallurgy. Specimens were tested over a range of temperature in torsion using broadband viscoelastic spectroscopy. Composites processed via powder metallurgy exhibited internal friction anomalies over a broad range of temperatures, in contrast to the single, sharpdoi:10.1557/jmr.2005.0316 fatcat:uohwytwgqnas7iuqh2x6mbhc5y