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Measurement of Lattice Displacements at Planar Defects in 2H and 18R Martensites

  • Adriana María Condó (a1) (a2) and Francisco Carlos Lovey (a1)

A review of transmission electron microscopy studies of planar defects in 18R and 2H martensites in Cu-Zn-Al alloys is presented. The non-basal plane faults observed in the 2H structure, the F1 faults, show two kinds of dislocations at their ends. In contrast, two types of non-basal plane faults are observed in the 18R structure, Fo and Fx faults. The non-basal plane faults can be composed of segments of Fo and Fx faults. Six types of imperfect dislocations appear, depending on the type of basal plane fault ending at the non-basal plane fault. The Burgers vectors of all these dislocations have been determined from the contrast analysis of the images and HREM observations.

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Ahlers, M. (1986). Martensite and equilibrium phases in Cu-Zn and Cu-Zn-Al alloys. Prog Mater Sci 30, 135186.
Andrade, M., Chandrasekaran, M., & Delaey, L. (1984). The basal plane stacking faults in 18R martensite of copper base alloys. Acta Metall 32, 18091816.
Andrade, M., Delaey, L., & Chandrasekaran, M. (1982). On some lesser known planar defects in β′1 Cu-Zn-Al martensite. J Physique, Colloque C4 43, C4-673C4-678.
Condó, A.M. & Lovey, F.C. (1994). Lattice relaxation around non-basal plane stacking defects in 2H martensite. Phil Mag A 70, 6373.
Condó, A.M. & Lovey, F.C. (1995). Detailed study of stacking faults in martensite. J Physique IV, Colloque C8 5, C8-811C8-816.
Condó, A.M. & Lovey, F.C. (1999). Imperfect dislocations at non-basal plane defects in 18R and 2H martensites: Transmission electron microscopy studies. Phil Mag A 79, 511526.
Condó, A.M. & Lovey, F.C. (2003). Interaction of twin boundaries with stacking faults in 2H martensite: A high-resolution electron microscopy study. Phil Mag 83, 14791493.
Cook, J.M., O'Keefe, M.A., Smith, D.J., & Stobbs, W.M. (1983). The high-resolution electron microscopy of stacking defects in Cu-Zn-Al shape memory alloy. J Microsc 129, 295306.
Guenin, G., Pynn, R., Rios Jara, D., Delaey, L., & Gobin, F.P. (1980). Lattice dynamics of Cu-Zn-Al martensite. Phys Stat Sol (a) 59, 553556.
Head, A., Humble, P., Clarebrough, L., Morton, A., & Forewood, C. (1973). Defects in Crystalline Solids, Vol. 17. Amsterdam: North Holland.
Kabra, V.K., Pandey, D., & Lele, S. (1988). On the characterization of basal plane stacking faults in N9R and N18R martensites. Acta Metall 36, 725734.
Kajiwara, S. (1971). Stacking disorder in martensite of Cu-Zn alloy. J Phys Soc Japan 30, 768774.
Lovey, F.C. (1987). The fault density in 9R type martensites: A comparison between experimental and calculated results. Acta Metall 35, 11031108.
Lovey, F.C., Coene, W., Van Dyck, D., Van Tendeloo, G., Van Landuyt, J., & Amelinckx, S. (1984a). HREM imaging conditions for stacking sequences in 18R martensite of Cu-Al alloys. Ultramicroscopy 15, 345356.
Lovey, F.C., Van Tendeloo, G., & Amelinckx, S. (1984b). The nature of some planar defects in 2H martensite of Cu-Al alloys as determined by HREM. Phys Stat Sol (a) 85, 2937.
Lovey, F.C., Van Tendeloo, G., Van Landuyt, J., Delaey, L., & Amelinckx, S. (1984c). On the nature of various stacking defects in 18R martensite in Cu-Al alloys. Phys Stat Sol (a) 86, 553564.
Nishiyama, Z., Kakinoki, J., & Kajiwara, S. (1965). Stacking faults in the martensite of Cu-Al alloy. J Phys Soc Japan 20, 11921211.
Pelegrina, J.L. & Ahlers, M. (1992). The martensitic phases and their stability in Cu-Zn and Cu-Zn-Al alloys—III. The transformation between the high temperature phase and the 2H martensite. Acta Metall Mater 40, 32213227.
Rios-Jara, D. (1984). Etude des dislocations de l'alliage Cu-Zn-Al en phase β—liaison avec les transformations martensitiques thermoelastiques. Ph.D. Thesis, INSA, Lyon, France.
Rodríguez, P.L., Lovey, F.C., Guenin, G., Pelegrina, J.L., Sade, M., & Morin, M. (1993). Elastic constants of the monoclinic 18R martensite of a Cu-Zn-Al alloy. Acta Metall Mater 41, 33073310.
Zhu, M., Yang, D.Z., & Jia, C.L. (1989). Non-basal plane defects in 18R martensite and the effect of abnormal defects on thermoelastic martensitic transformation. Metall Trans A 20A, 16311636.
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Microscopy and Microanalysis
  • ISSN: 1431-9276
  • EISSN: 1435-8115
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