Cu-29％Zn-3％Al合金中存在热弹性马氏体转变。高压电镜(1000—1200kV)观察表明,母相(β′)为DO_3结构,马氏体(M)为18R结构;试样厚处(～1μm)的马氏体片内可见微小棍状晶体堆积成的精细组织,棍状体粗约10nm并有界面分开;马氏体的表面凹凸不平、极不规则。试样薄处的β′-M界面呈平坦状或规则的锯齿状、排列着平行的位错线簇。尽管电镜试样在金相显微镜下观察到转变的可逆性,而在电镜下则只观察到正转变(β′→M)。这可能是因薄箔试样不易储存弹性能的结果。
The martensitic transformation in Cu-29%Zn-3%Al alloy occurs thermoelastically. High voltage TEM observation shows that the parent phase belongs to DO_3 and martensite belongs to 18R in structure. Fine structures of tiny packages with a traverse size of～10nm in martensite plates have been seen at the thicker part of the sample. The boundary between β' and M at the thinner part was flat or sawtooth-like composed parallel dislocation lines: Although the reversibility of the transformation in TEM samples has been observed under an optical microscope, only the β'→M transformation observed on TEM. Probably, the thickness of thiner part of the foil is too small to store enough elastic energy which is the driving force of the reverse transformation.
参考文献
| [1] | |
| [2] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%