Fonović, M.; Leineweber, A.; Robach, O.; Jägle, E. A.; Mittemeijer, E. J.: The Nature and Origin of ‘‘Double Expanded Austenite’’ in Ni-Based Ni–Ti Alloys Developing Upon Low Temperature Gaseous Nitriding. Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science 46 (9), pp. 4115 - 4131 (2015)
If manganese nodules can be mined in an environmentally friendly way, the critical metals needed for the energy transition could be produced with low CO2 emissions