Effect of the Thermomechanical Treatment on Structural and Phase Transformations in Cu–14Al–3Ni Shape Memory Alloy Subjected to High-Pressure Torsion

Structural and Phase Transformations and Physical and Mechanical Properties of Cu-Al-Ni Shape Memory Alloys Subjected to Severe Plastic Deformation and Annealing

“…As was determined, hot deformation via forging of the studied Cu-based alloys permits refining of austenite grains down to 0.5–1 mm [ 54 , 55 ]. However, the further subsequent cooling in air entails (i) the decomposition by the scheme β→β 1 +γ 2 (at temperatures above the T ED close to 840 K) and (ii) eutectoid decomposition via β 1 →α+γ 2 (at temperatures below T ED ) ( Figure 1 a), which is in good correspondence with the known data from [ 2 , 24 , 35 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 ]. However, quenching of the alloys after their hot forging allows us to prevent the eutectoid decomposition.…”

“…In our works [ 35 , 51 , 52 , 53 , 54 , 55 , 56 , 57 ] it was found that a radical decrease in the grain size during SPD and, accordingly, an increase in the length of the grain boundaries permits us to make the level of embrittlement of SME β-copper alloys lower. Any other methods of refinement of the grain structure of these alloys using alloying additives, heat treatment, rapid quenching, powder metallurgy, and a number of other corresponding methods turned out to be generally unsuccessful [ 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 ].…”

Microstructure and Thermoelastic Martensitic Transformations in Ni-Mn-Al Based Alloys

“…The Ural school-seminar of metal scientists-young researchers phase composition of the alloys was determined by the X-ray method and from selected electron diffraction patterns [1][2][3][4][5][6][7][8][9][10][11][12][13][14].…”

“…In [1,2], we comprehensively investigated the fine structure and the TMTs of these alloys and determined critical temperatures: M = 970 K, M = 920 K, A = 970 K, and A = 1020 K; M = 940 K, M = 930 K, A = 990 K, and A = 1000 K, respectively. The high temperature B2↔L1 0 phase transformations were detected in many binary and multicomponent intermetallic alloys based on nickel and titanium, such as Ni-Mn, Ni-Mn-Al, Ni-Al, Ni-Al-Co, Ni-Cu-Al, Ti-Rh, Ti-Rh-Ni, Ti-Ir, and Ti-Ir-Ni [3][4][5][6][7][8][9][10][11][12][13][14]. We assumed that these transformations in the alloys based on these intermetallic compounds also has the character of TMT, which should cause shape memory effects in them.…”

High-pressure phases in the Al86Ni6Gd4Tb2Er2 alloy

“…1 , Пушкарев Б. Е. 1 [2,3], сверхнизкие и сверхвысокие температуры [4,5], сильные электрические и магнитные поля [6,7], сверхбыстрое охлаждение из расплава [8,9] и др. Сочетание этих методов позволяет дополнительно существенно расширить области метастабильных состояний и получать материалы с различной структурной иерархией: аморфной (в т. ч. объемноаморфной), квази-и нанокристаллической, и, соответственно, с широким спектром их различных свойств [10,11].…”