A study of B2↔B19↔B19′ two-stage martensitic transformation in a Ti50Ni40Cu10 alloy

Y. C. Lo*, S. K. Wu, H. E. Horng

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

107 引文 斯高帕斯(Scopus)

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 β of B19′ martensite will increasing 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.

原文英語
頁(從 - 到)747-759
頁數13
期刊Acta Metallurgica Et Materialia
41
發行號3
DOIs
出版狀態已發佈 - 1993 三月

ASJC Scopus subject areas

  • 工程 (全部)

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