Multicomponent Metallic Ni–Mn-Based Alloys with Thermally, Mechanically, and Magnetically Controlled Shape Memory Effects

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.…”

Crystal Structure of Martensite and Orientation Relationships During Thermoelastic Martensitic Transformations in Ni-Mn-Based Alloys

“…Important information about the critical temperatures and physical nature of phase martensitic transitions is obtained by studies of the temperature dependences of physical properties [1][2][3][4][5][6][7][8][9][10][11][12][13]. For example, the method of electrical resistivity ρ(T) is often used to analyze phase structural transformations in intermetallic alloys.…”

“…The martensitic transformations in Ni 50 Mn 50 and Ni 49 Mn 51 alloys proceed at high temperatures, which is of particular interest for studying the structure and properties of these alloys in the transformation temperature range. In [1][2][3][4][5][6][7][8][9][10][11], we comprehensively investigated the structure and the physical properties of these alloys, revealed a thermoelastic mechanism of the martensitic transformations, and determined the critical temperatures of the TMTs in them (M = 970 K, M = 920 K, A = 970 K, A = 1020 K, M = 940 K, M = 930 K, A = 990 K, A = 1000 K). The high-temperature B2 → L1 0 phase transformations are known to occur in many binary and multicomponent intermetallic alloys based on nickel and titanium, such as Ni-Mn, Ni-Al, Ni-Mn-Al, Ni-Mn-Ga, Ni-Al-Co, Ti-Rh, Ti-Ir, Ti-Rh-Ni, and Ti-Ir-Ni, etc.…”

“…The high-temperature B2 → L1 0 phase transformations are known to occur in many binary and multicomponent intermetallic alloys based on nickel and titanium, such as Ni-Mn, Ni-Al, Ni-Mn-Al, Ni-Mn-Ga, Ni-Al-Co, Ti-Rh, Ti-Ir, Ti-Rh-Ni, and Ti-Ir-Ni, etc. [1][2][3][4][5][6][7][8][9][10][11][12][13]. There is reason to believe that these transformations in the alloys based on such intermetallic compounds and in other B2 nonferrous alloys The Ural school-seminar of metal scientists-young researchers alloyed manganese nickelide) also have signs of TMTs, and this fact should cause the shape memory effects in them.…”