Relation between microstructure, physical properties and martensitic transformations in Ni-rich Ni-Ti shape memory alloys

被引：0

作者：

Wassermann, EF ^{[1
]}

Somsen, C ^{[1
]}

Kästner, J ^{[1
]}

Schryvers, D ^{[1
]}

Kompatscher, M ^{[1
]}

Kostorz, G ^{[1
]}

机构：

[1] Gerhard Mercator Univ, Tieftemp Phys, D-47048 Duisburg, Germany

来源：

PRICM 4: FORTH PACIFIC RIM INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS AND PROCESSING, VOLS I AND II | 2001年

关键词：

martensitic transformations; nickel titanium (NiTi) shape memory alloys; nickel-titanium precipitates (Ni4Ti3); B19 ' martensite and R-phase precursors;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We investigated NixTi180-x alloys with 51 less than or equal to x less than or equal to 54 at% Ni, quenched from 1000degreesC (B2 phase region). SANS measurements reveal the presence of precipitates on a length scale from 0.9nm (x = 51.5) to 1.32nm (x = 54), increasing in volume fraction from 0.3 % to 6 %. Diffuse diffraction spots in TEM identify the precipitates as Ni4Ti3, HREM shows their coherence. Additional reflections for x = 52 can be related to precursors of B19' martensite or R-phase, respectively. We assume that the strain fields of the Ni4Ti3 precipitates are the regions of R-phase formation, i.e. the precipitates trigger the R-martensite, responsible for the SME. The high value of the absolute resistivity (rho similar to 100muOmegacm) and the increase of rho(T)up to 40% between R.T. and 4.2K very likely originate from strain fields due to Ni4Ti3, precipitates in the early stage of formation.

引用

页码：1791 / 1794

页数：4

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