A STUDY OF B2[--]B19[--]B19' 2-STAGE MARTENSITIC-TRANSFORMATION IN A TI50NI40CU10 ALLOY

被引：116

作者：

LO, YC ^{[1
]}

WU, SK ^{[1
]}

HORNG, HE ^{[1
]}

机构：

[1] NATL TAIWAN NORMAL UNIV, DEPT PHYS, TAIPEI 117, TAIWAN

来源：

ACTA METALLURGICA ET MATERIALIA | 1993年 / 41卷 / 03期

关键词：

D O I：

10.1016/0956-7151(93)90007-F

中图分类号：

T [工业技术];

学科分类号：

08 [工学];

摘要：

The B2 <-- --> B19 <-- --> B19' two-stage martensitic transformation in a Ti50Ni40Cu10 alloy has been investigated by electrical resistivity, DSC, X-ray diffraction and internal friction measurements. The shear modulus of B19 martensite has an unusually low value over a broad temperature range between the two shear modulus minima. The B2 <-- --> B19 transformation is thus proposed to proceed under the condition of deep shear modulus softening. X-ray diffraction results show that the B19 <-- --> B19' is an incomplete transformation and that the monoclinic angle beta of B19' martensite will increase with decreasing temperature. This indicates that the B19 <-- --> B19' transformation has the characteristic of the continuously monoclinic distortion of B19' martensite, which is similar to that of the continuously rhombohedral distortion of R-phase. The opposite behavior observed in electrical resistivity and DSC measurements for B2 <-- --> B19 and B19 <-- --> B19' transformations is also discussed.

引用

页码：747 / 759

页数：13

共 43 条

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THIN FOIL ELECTRON-MICROSCOPE OBSERVATIONS ON NITICU SHAPE MEMORY ALLOYS [J].