Influence of Thermomechanical Treatment on Structural-Phase Transformations and Mechanical Properties of the Cu–Al–Ni Shape-Memory Alloys

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.…”

The Effect of Heat Treatment on the Structure and Mechanical Properties of Nanocrystalline Cu–14Al–3Ni Alloy Subjected to High-Pressure Torsion

“…deformation (SPD) and, therefore, the increase in the boundary length [8][9][10][11][12][13][14]. At the same time, other various methods used for refining the grain structure of the alloys [15][16][17][18][19][20][21] with application of alloying additions [17,21], heat treatment [15][16][17][18], rapid quenching [6], powder metallurgy and others [19,20], as a rule, were found to be ineffective.…”