What is the fine-grained topic of the following text: The methods of Mss spectroscopy and X-ray diffraction analysis have been used to study the processes of a solid-phase alloying of the iron alloys with a bcc lattice by nitrogen that occur upon ball-mill mechanical activation in the presence of chromium nitrides. Only return the topic.
Study of solid-phase alloying of iron alloys with nitrogen using Mss spectroscopy and X-ray diffraction analysis.