Martensite ordering and stabilization in copper based shape memory alloys

Journal Article · Thu Jun 01 04:00:00 EDT 1995 · Materials Research Bulletin

DOI:https://doi.org/10.1016/0025-5408(95)00053-4· OSTI ID:82656

Adiguezel, O ^[1]

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1. Firat Univ., Elazig (Turkey). Dept. of Physics

Stabilization behavior of the martensite in shape memory CuZnAl and CuAlMn alloys has been studied by x-ray measurements and electron microscopy. In these alloys influenced by both quenching and post-quench heat treatments, the degree of stabilization depends on quenching conditions. The stabilization process is mainly due to structural change and atomic arrangement in the martensitic lattice inherited from the parent phase. From x-ray results, it is suggested that stabilization and loss of memory are directly related to disordering in a martensitic state. In the present study, it was concluded that the spacing differences ({delta}d) between some selected pairs of diffraction planes of type (h{sub 1}k{sup 1}1) and (h{sub 2}k{sub 2}1) satisfying the relation (h{sub 1}{sup 2}-h{sub 2}{sup 2})/3 = (k{sub 2}{sup 2}-k{sub 1}{sup 2})/n, with n = 1 for 9R and n = 4 for 18R martensites reflect the degree of ordering in martensite, in addition to the lattice distortion parameters defined as {phi} = {vert_bar}sin{sup 2}{theta}{sub 202}-sin{sup 2}{theta}{sub 122}{vert_bar} and {phi}{prime} = {vert_bar}sin{sup 2}{theta}{sub 320}-sin{sup 2}{theta}{sub 040}{vert_bar}.

• OSTI ID: 82656
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 6 Vol. 30; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CHEMICAL COMPOSITION
COPPER ALLOYS
CRYSTAL STRUCTURE
ELECTRON MICROSCOPY
EXPERIMENTAL DATA
HEAT TREATMENTS
MANGANESE ALLOYS
QUENCHING
X-RAY DIFFRACTION
ZINC ALLOYS