Structure of martensite in sputter-deposited Ti–Ni thin films containing Guinier–Preston zones
Structure of martensite in sputter-deposited Ti–Ni thin films containing Guinier–Preston zones
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DOI：
10.1016/s1359-6454(01)00204-x
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发表时间：
2001-09
期刊：
影响因子：
9.4
通讯作者：
J. X. Zhang;M. Sato;A. Ishida
中科院分区：
文献类型：
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作者：
J. X. Zhang;M. Sato;A. Ishida
研究发现，在溅射沉积Ti-48.9at%Ni薄膜中，马氏体孪晶模式受Guinier-Preston（GP）区（几个原子层厚度的共格片状析出物）的影响。在等原子Ti-Ni薄膜（无GP区）或GP区有限的薄膜中，观察到的孪晶主要是晶格不变量剪切。随着退火温度和/或退火时间的增加，GP区的数量和尺寸增加。这些GP区影响马氏体相变。在马氏体相变过程中，它们改变了孪晶带宽比作为晶格不变剪切，并增加了（11 - 1）孪晶出现的概率。当GP区的数量和尺寸足够时，在薄膜马氏体中观察到（001）化合物孪晶作为内部缺陷。通常，（001）精细孪晶板以彼此之间具有约120°的角度的三个取向布置。虽然只有一种关系，即，(111)在这些（001）孪晶区域之间，存在三种边界，即，（111）孪晶面、平均近似（1 <$1 <$3）面或（11 1 <$）面。据信，这些形态也是自适应的。
It was found that Guinier–Preston (GP) zones (coherent plate precipitates with a thickness of a few atomic layers) have an influence on the twinning modes of martensite in sputter-deposited Ti–48.9at%Ni thin films. In an equiatomic Ti–Ni thin film (without GP zone) or a thin film with limited GP zone, 〈011〉 type II twins were predominantly observed as a lattice invariant shear. With increasing annealing temperature and/or annealing time, GP zones grow in amount and in size. These GP zones influence the martensitic transformation. They change the twin band width ratio as a lattice invariant shear during martensitic transformation and increase the probability of appearance of (11 1 ̄ ) twinning. When GP zones are sufficient in amount and size, (001) compound twinning was observed as internal defects in the thin film martensite. In general the (001) fine twinning plates are arranged in three orientations with an angle of about 120° between each other. Though there is only one kind of relationship, i.e., (111) twinning, between these (001) twinning regions, three kinds of boundaries exist, i.e., a (111) twinning plane, an averagely approximate (1 ̄ 1 ̄ 3 ) plane, or a (11 1 ̄ ) plane. It is believed that these morphologies are also self-accommodated.