The effect of quenching conditions on phase transformation characteristics and microstructural features of Cu–Al–Ni–Ti shape memory alloys (SMAs) have been studied. The alloys were synthesised via conventional powder metallurgy process using elemental metal powders. Four different quenching techniques, such as (a) two-step quenching, first to 100°C and then to 0°C; (b) two-step quenching, initially to 40°C and later to 0°C; (c) direct quenching to 40°C and (d) direct quenching to 0°C, were used. The microstructural features and phase transformations that the alloys had undergone were studied using FE-SEM and XRD techniques. The martensitic phase transformation analyses were carried out by differential scanning calorimeter while the mechanical properties were studied by microhardness and flexural bending tests. The results obtained clearly indicate that the quenching routes followed have a remarkable influence on the properties of Cu-based SMAs.
BaiY. J., XuX. G., LiuY. X., XiaoL. M. and GengG. L.: ‘Structural change due to martensite ageing of CuZnAlMnNi shape memory alloy’, Mater. Sci. Eng. A, 2002, 334, 49–52. doi: 10.1016/S0921-5093(01)01761-0
2.
ChentoufS. M., BouabdallahM., ChenitiH., EberhardtA., PatoorE. and SariA.: ‘Ageing study of Cu–Al–Be hypoeutectoid shape memory alloy’, Mater. Charact., 2010, 61, 1187–1193. doi: 10.1016/j.matchar.2010.07.009
3.
ObradóE., MañosaL. and PlanesA.: ‘Quenching effects in Cu-Al-Mn shape memory alloy’, Mater. Sci. Eng. A, 1999, 273–275, 586–589. doi: 10.1016/S0921-5093(99)00434-7
4.
KayaliN., ZenginR. and AdiguzelO.: ‘Influence of aging on transformation characteristics in shape memory CuZnAl alloys’, Met. Mater. Trans. A, 2000, 31A, 349–354. doi: 10.1007/s11661-000-0270-4
5.
AydogduA., AydogduY., AdiguzelO.: ‘Long-term ageing behaviour of martensite in shape memory Cu-Al-Ni alloys’, J. Mater. Process. Technol., 2004, 153–154, 164–169. doi: 10.1016/j.jmatprotec.2004.04.198
6.
AhlersM.: ‘Martensite and equilibrium phases in Cu-Zn and Cu-Zn-Al alloys’, Prog. Mater. Sci., 1986, 30, 135–186. doi: 10.1016/0079-6425(86)90007-1
7.
MiyazakiS.: ‘Development and Characterization of Shape Memory Alloys’, in ‘Shape memory alloys’, CISM Courses and Lectures, (eds. FrémondM. and MiyazakiS.), 72–76; 1996, Wien-New York, Springer.
8.
RapacioliR. and AhlersM.: ‘Ordering in ternary β phase CuZnAl alloys’, Scr. Metall., 1977, 11, 1147–1150. doi: 10.1016/0036-9748(77)90324-6
9.
WuM. H., PerkinsJ. and WaymanC. M.: ‘Long range order, antiphase domain structures, and the formation mechanism of α1 (“Bainite”) plates in a CuZnAl alloy’, Acta. Metall., 1989, 37, 1821–1837. doi: 10.1016/0001-6160(89)90067-9
10.
WuM. H. and WaymanC. M.: ‘On the interpretation of long range order in Cu-Zn-Al shape memory alloys’, Scripta Metall. Mater., 1991, 25, 1635–1640. doi: 10.1016/0956-716X(91)90466-E
11.
HuL., KothalkarA., ProustG., KaramanI. and RadovicM.: ‘Fabrication and Characterization of NiTi/Ti3SiC2 and NiTi/Ti2AlC Composites’, J. Alloys Compd., 2014, 610, 635–644. doi: 10.1016/j.jallcom.2014.04.224
12.
RohD. W., LeeE. S. and KimY. G.: ‘Effects of ordering type and degree on monoclinic distortion of 18R-type martensite in Cu-Zn-Al alloys’, Metall. Trans. A, 1992, 23, 2753–2760. doi: 10.1007/BF02651754
13.
LeuS. S. and HuC. T.: ‘The aging effect on Cu−Zn−Al shape memory alloys with low contents of aluminum’, Metall. Trans. A, 1991, 22, 25–33.
14.
SarıU. and Aksoyİ.: ‘Electron microscopy study of 2H and 18R martensites in Cu-11.92 wt% Al-3.78 wt% Ni shape memory alloy’, J. Alloys Compd., 2006, 417, 138–142. doi: 10.1016/j.jallcom.2005.09.049
15.
WuM. H., DuerigT. W., MeltonK. N., StöckelD. and WaymanC. M.: ‘Cu-based shape memory alloys’. in ‘Engineering aspects of shape-memory alloys’ (eds. T. W. Duerig, K. N. Melton, D. Stöckel and C. M. Wayman), 69–88; 1990, London, Butterworth-Heinemann.
16.
Pérez-LandazábalJ. I., RecarteV., Sánches-AlarcosV., NóM. L. and JuanS. J.: ‘Study of the stability and decomposition process of the β phase in Cu-Al-Ni shape memory alloys’, Mater. Sci. Eng. A, 2006, 438–440, 734–737. doi: 10.1016/j.msea.2005.12.066
17.
PourkhorshidiS., ParvinN., KenevisiM. S., NaeimiM. and KhanikiH. E.: ‘A study on the microstructure and properties of Cu-based shape memory alloy produced by hot extrusion of mechanically alloyed powders’, Mater. Sci. Eng. A, 2012, 556, 658–663. doi: 10.1016/j.msea.2012.07.044
18.
BhattacharyaS., BhuniyaA. and BanerjeeM. K.: ‘Influence of minor additions on characteristics of Cu-Al-Ni alloy’, Mater. Sci. Technol., 1993, 9, 654–658. doi: 10.1179/mst.1993.9.8.654
19.
WagnerM. F.-X., DeyS. R., GugelH., FrenzelJ., SomsenCh. and EggelerG.: ‘Effect of low-temperature precipitation on the transformation characteristics of Ni-rich NiTi shape memory alloys during thermal cycling’, Intermetallics, 2010, 18, 1172–1179. doi: 10.1016/j.intermet.2010.02.048
20.
RecarteV., Pérez-SáezR. B., San JuanJ., BocanegraE. H. and NóM. L.: ‘Dependence of the martensitic transformation characteristics on concentration in Cu-Al-Ni shape memory alloys’, Metall. Mater. Trans. A, 2002, 33, 2581–2591. doi: 10.1007/s11661-002-0379-8
21.
BaloŞ.N. and SelN.: ‘Effects of thermal aging on transformation temperatures and some physical parameters of Cu-13.5wt.%Al-4wt.%Ni shape memory alloy’, Thermochim. Acta, 2012, 536, 1–5. doi: 10.1016/j.tca.2012.02.007
22.
SutouY., OmoriT., YamauchiK., OnoN., KainumaR. and IshidaK.: ‘Effect of grain size and texture on pseudoelasticity in Cu–Al–Mn-based shape memory wire’, Acta Mater., 2005, 53, 4121–4233. doi: 10.1016/j.actamat.2005.05.013
23.
MorrisM. A.: ‘Influence of boron additions on ductility and microstructure of shape memory Cu-Al-Ni alloys’, Scr. Metall. Mater., 1991, 25, 2541–2546. doi: 10.1016/0956-716X(91)90065-9
24.
MorrisM. A.: ‘High temperature properties of ductile Cu-Al-Ni shape memory alloys with boron additions’, Acta Metall. Mater., 1992, 40, 1573–1586. doi: 10.1016/0956-7151(92)90100-S
25.
MorrisM. A. and LipeT.: ‘Microstructural influence of Mn additions on thermoelastic and pseudoelastic properties of Cu-Al-Ni alloys’, Acta Metall. Mater., 1994, 42, 1583–1594. doi: 10.1016/0956-7151(94)90368-9
26.
SarıU. and KırındıT.: ‘Effects of deformation on microstructure and mechanical properties of a Cu–Al–Ni shape memory alloy’, Mater. Charact., 2008, 59, 920–929. doi: 10.1016/j.matchar.2007.07.017
27.
ChungC. Y., LamC. W. H. and TanS. S.: ‘Effect of parent phase ageing on CuZnAl shape memory alloys with Mn and Zr addition’, Mater. Lett., 1998, 33, 291–296. doi: 10.1016/S0167-577X(97)00111-0
28.
WangZ., LiuX. F. and XieJ. X.: ‘Effect of γ2 phase evolution on mechanical properties of continuous columnar-grained Cu-Al-Ni alloy’, Mater. Sci. Eng. A, 2012, 532, 536–542. doi: 10.1016/j.msea.2011.11.019
29.
GaoY., ZhuM. and LaiJ. K. L.: ‘Microstructure characterization and effect of thermal cycling and ageing on vanadium-doped Cu-Al-Ni-Mn high-temperature shape memory alloy’, J. Mater. Sci., 1998, 33, 3579–3584. doi: 10.1023/A:1004647127294
30.
TatarC. and KazancS.: ‘Investigation of the effect of pressure on thermodynamic properties and thermoelastic phase transformation of CuAlNi alloys: A molecular dynamics study’, Curr. Appl. Phys., 2012, 12, 98–104. doi: 10.1016/j.cap.2011.04.050
31.
MassalskiT. B. and MizutaniU.: ‘Electronic structure of Hume-Rothery phases’, Prog. Mater. Sci., 1978, 22, 151–262. doi: 10.1016/0079-6425(78)90001-4
32.
AnthonyL., OkamotoJ. K. and FultzB.: ‘Vibrational entropy of ordered and disordered Ni3Al’, Phys. Rev. Lett., 1993, 70, 1128–1130. doi: 10.1103/PhysRevLett.70.1128
33.
AnthonyL., NagelL. J., OkamotoJ. K. and FultzB.: ‘Magnitude and origin of the difference in vibrational entropy between ordered and disordered Fe3Al’, Phys. Rev. Lett., 1994, 73, 3034–3037. doi: 10.1103/PhysRevLett.73.3034
34.
CoppolaA. M., HuL., ThakreP. R., RadovicM., KaramanI., SottosN. R. and WhiteS. R.: ‘Active cooling of a microvascular shape memory alloy-polymer matrix composite hybrid material’, Adv. Eng. Mater., 2016, 18, 1145–1153. doi: 10.1002/adem.201600020
35.
EskilM. and KayaliN.: ‘X-ray analysis of some shape memory CuZnAl alloys due to the cooling rate effect’, Mater. Lett., 2006, 60, 630–634. doi: 10.1016/j.matlet.2005.09.019
36.
DagdelenF., GokhanT., AydogduA., AydogduY. and AdigüzelO.: ‘Effects of thermal treatments on transformation behavior in shape memory Cu-Al-Ni alloys’, Mater. Lett., 2003, 57, 1079–1085. doi: 10.1016/S0167-577X(02)00934-5
37.
SampathV.: ‘Effect of thermal processing on microstructure and shape-memory characteristics of a copper-zinc-aluminum shape-memory alloy’, Mater. Manuf. Process., 2007, 22, 9–14. doi: 10.1080/10407780601015808
38.
ObradóE., MañosaL. and PlanesA.: ‘Stability of the bcc phase of Cu-Al-Mn shape-memory alloys’, Phys. Rev. B, 1997, 56, 20–23. doi: 10.1103/PhysRevB.56.20
39.
SaudS. N., HamzahE., AbubakarT. and FarahanyS.: ‘Structure–property relationship of Cu-Al-Ni-Fe shape memory alloys in different quenching media’, J. Mater. Eng. Perform., 2014, 23, 255–261. doi: 10.1007/s11665-013-0759-9
40.
MalimánekJ. and ZárubováN.: ‘Calorimetric investigation of the movement of phase interfaces in a Cu-Al-Ni single crystal’, Scr. Metall. Mater., 1995, 32, 1347–1352. doi: 10.1016/0956-716X(95)00169-V
41.
SalzbrennerR. J. and CohenM.: ‘On the thermodynamics of thermoelastic martensitic transformations’, Acta Metall., 1979, 27, 739–748. doi: 10.1016/0001-6160(79)90107-X
42.
HallE. O.: ‘The deformation and ageing of mild steel: III discussion of results’, Proc. Phys. Soc. London, 1951, B64, 747–753. doi: 10.1088/0370-1301/64/9/303
43.
PetchN. J.: ‘The cleavage strength of polycrystals’, J. Iron Steel Inst., 1953, 174, 25–28.
