Optimal deformation and ion irradiation modes for production of a uniform submicrograin structure in molybdenum

Microstructure and Microhardness Evolution in Pure Molybdenum Processed by High‐Pressure Torsion

“…Nevertheless, HPT has an important advantage because experiments on a magnesium alloy showed that it is generally feasible to conduct HPT processing at a relatively lower temperature than ECAP, including at room temperature (RT), because of the large hydrostatic pressure that is imposed on the sample during the processing operation. [21] For refractory metals, reports are now available on the processing of W by ECAP or HPT over a range of temperatures from 673 to 1273 K, [22][23][24][25] the processing of Ta by ECAP at RT [26][27][28][29][30][31] or at 1173 or 1473 K [32] and HPT at RT, [33][34][35][36][37] the processing of V by HPT at RT, [38][39][40] and the processing of Mo by ECAP or HPT at temperatures from 623 to 1073 K [41][42][43][44][45][46][47][48] and HPT at both RT [38,[49][50][51][52][53][54][55][56][57] and a cryogenic temperature of 80 K. [54,56] Although several reports are now available on the processing of Mo by HPT, there have been no systematic studies of the concurrent evolution of microstructural refinement and hardness in pure molybdenum as are available, for example, in conventional fcc metals such as aluminum, …”

“…Nevertheless, HPT has an important advantage because experiments on a magnesium alloy showed that it is generally feasible to conduct HPT processing at a relatively lower temperature than ECAP, including at room temperature (RT), because of the large hydrostatic pressure that is imposed on the sample during the processing operation . For refractory metals, reports are now available on the processing of W by ECAP or HPT over a range of temperatures from 673 to 1273 K, the processing of Ta by ECAP at RT or at 1173 or 1473 K and HPT at RT, the processing of V by HPT at RT, and the processing of Mo by ECAP or HPT at temperatures from 623 to 1073 K and HPT at both RT and a cryogenic temperature of 80 K …”

Influence of a high-power pulsed ion beam on the mechanical properties of corundum ceramics

“…The use of ceramics with gradient properties has great prospects, when the surface layer differs in its characteristics from the corresponding parameters of the bulk layers. As shown in works [11][12][13][14][15][16][17][18][19][20][21][22][23][24], surface treatment can be effectively carried out using low energy high current pulsed electron beam (LEHCPEB) [11][12][13], laser treatment [14,15] and high-power pulsed ion beam (HPPIB) [16][17][18][19][20][21][22][23][24]. To study thin modified layers of dielectrics, the method of secondary ion mass spectrometry [25][26][27] and the Rutherford backscattering method [28,29] have proved to be very useful.…”

“…At present, studies are underway to modify the surface of metals and alloys by high-power pulsed ion beams [19][20][21][22]30]. At the same time, the physicochemical processes taking place in the nearsurface layers of dielectric materials under treatment HPPIB have been little studied.…”

“…They allow to carry out high-precision treatment of complex shaped ceramic parts with a short exposure time to the surface, are equipped with simple process automation, etc. Among radiation methods of influence on materials, the method of surface modification by highpower pulsed ion beams (HPPIB) [16][17][18][19][20][21][22][23][24] widely is used.…”