Pressure causes osmium to change state of matter

Using metallic osmium (Os) in experimentation, an international group of researchers demonstrated that ultra-high pressures cause core electrons to interplay, which results in experimentally observed anomalies in the compression behavior of the material. Os is one of Earth’s most exceptional elemental materials, possessing the highest known density at ambient pressure, one of the highest cohesive […]

One Minute Mentor: Tempering Powder Metallurgy Steels

Usually, powder metallurgy steel parts having a density greater than 6.7 g/cm3 (0.242 lb/in.3) should be tempered after hardening. Recommended tempering temperatures for PM parts range from 150 to 200°C (300 to 390°F) with 175°C (350°F) being common.