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Platov South-Russian State Polytechnic University, Novocherkask, Russia
Prof. Yuri Grigoryevich Dorofeyev was born on June 21, 1930 in the city of Kerky, Turkmenistan. In 1952 he graduated with honors from the Novocherkassk Polytechnic Institute (NPI), after which he worked as an engineer at the Novocherkassk Petroleum Engineering Plant.
In 1955 he returned to the NPI, where he worked his career from assistant to head of the Department of Materials Science and Materials Technology (1968 – 2016). Dorofeyev Yu. G. headed the laboratory for the use of metal chips in 1958. On the basis of studies of the process of its compaction, he defended his thesis in Dnepropetrovsk (1960), Ukraine. His further studies are related to the development of theory of formation of structure and properties of powder materials for various purposes. In 1967 he defended his doctoral dissertation in Rostov-on-Don, Russia.
Dorofeyev Yu. G. created a new scientific direction in the field of powder metallurgy related to the development of the scientific foundations of the process for producing compact materials and products from heated porous powder billets, which he called dynamic hot pressing (DHP). Of prime importance for powder materials science is obtaining the energy equations of compaction of powder and particulate materials and the relationship with their physical constants. Prof. Dorofeyev introduced new objects into the technology of powder metallurgy, namely, porous semi-finished products. Their transformation into finished products implied the use of traditional pressure processing methods along with powder metallurgy techniques. This combination made it possible to achieve not only high density at moderate pressures, but also to significantly improve properties due to strain-induced structure formation. The study of interparticle jointing formation during hot deformation of porous preforms was a major preoccupation of the works of Dorofeyev Yu. G.
The results obtained were reflected in more than 1000 publications, including 8 monographs and more than 100 copyright certificates and patents. The works of Yuri Dorofeyev made it possible to create a new branch of metalworking: plants, sections and workshops for the manufacture of parts for various purposes from hot-deformed powder materials. They were aimed at creating new technological methods that ensure the formation of a given structure and properties of material, and allow more efficient molding of products with complex configurations with special emphasis on creation of bimetallic, multilayer and composite materials and products from them. Late in the 60s – early 70s on the initiative of G. V. Samsonov and M. M. Ristic Yuri Dorofeyev was involved in the work of the International Team for the Study of Sintering, transformed into the International Institute for the Science of Sintering (1972).
Yuri Dorofeyev made a great contribution to the training of scientific and engineering personnel. He organized in 1986 at the university the training of engineers in the specialty “Powder metallurgy, composite materials, coatings”. Among the students of Yuri Dorofeyev there are 10 doctors and more than 100 candidates of technical sciences. His merits in the training and development of powder metallurgy were highly appreciated. He was awarded the honorary title “Honored Worker of Science and Engineering of the RSFSR” (1977), the breastplate “Honorary Worker of Higher Professional Education of the Russian Federation” (1995), the “Badge of Honor” (1982) and “Friendship” (1998) and many medals. Yuri Dorofeyev was an honorary professor of the PSRSPU (NPI). In 2002, he was awarded the Prize and Medal named after P. G. Sobolevsky “For Outstanding Merits in the Field of Powder Materials Science” by the Ministry of Education of the Russian Federation, the Ural Branch of the Russian Academy of Sciences, and the Public Fund “Transfer” in Perm. In February 2014, by a decision of the Bureau of the Ukrainian Materials Science Society, he was awarded the G. V. Samsonov Award for outstanding services in the development of modern materials science.
Yuri Grigoryevich Dorofeyev, an innovator in the field of “dynamic hot pressing”, died in Novocherkassk, Rostov Region, Russia, on April 26, 2016.