上海交通大学学报

上海交通大学学报（自然版）

• 金属学与金属工艺 • 上一篇    下一篇

Ni-Al系合金中的逆马氏体相变

周正存，杨洪，严勇健   

  1. (苏州市职业大学 机电工程系， 江苏 苏州 215104)
  • 收稿日期:2009-03-12 修回日期:1900-01-01 出版日期:2010-05-31 发布日期:2010-05-31

Internal Friction of Phase Transformation in NiAl Based AlloysZHOU Zhengcun,YANG Hong,YAN Yongjian   

  1. (Department of Mechanical and Electronic Engineering, Suzhou Vocational University, Suzhou 215104, Jiangsu, China)
  • Received:2009-03-12 Revised:1900-01-01 Online:2010-05-31 Published:2010-05-31

摘要： 采用多功能内耗仪测量室温至400 °C过程中，油淬Ni36Al二元合金以及Ni27Al-12Fe、Ni-21.2Al-20Fe和Ni-24Al-16Fe三元合金的内耗和相对动力学模量，并采用X射线衍射仪分析了合金的相组成.结果表明：油淬Ni-36Al合金具有完全马氏体结构，油淬Ni-21.2Al-20Fe合金中含少量马氏体和大量类似Ni3Al和Ni5Al3的金属间化合物；在相同的频率和升温速率条件下，油淬Ni-21.2Al-20Fe的内耗峰最高且最窄，其内耗峰所对应的温度最低，油淬Ni-36Al的内耗峰最低且最宽，其内耗峰所对应的温度最高，并随Fe含量的增加而降低，且与其当量Al（Aleq）含量有关；内耗峰高度与单位时间内马氏体（L10）转变为奥氏体（γ）的转变量有关，而总的转变量与转变时间（峰宽）有关.

关键词: Ni-Al合金, 内耗, 逆马氏体相变

Abstract: Internal friction and relative dynamic modulus in the oilquenched Ni-36Al, Ni-27Al-12Fe, Ni-21.2Al20Fe and Ni-24Al-16Fe were measured using a multifunctional internal friction apparatus from room temperature to 400 °C. It was suggested that the internal friction peak is resulted from reverse martensitic transformation of L10→γ during heating. The peak temperature is decreased when Fe content is increased and is also correlated with Aleq. The oilquenched Ni-21.2Al20Fe has the largest peak height, the narrowest peak width and the lowest peak temperature, while the oilquenched Ni-36Al alloy has the smallest peak height, the widest peak width and the highest peak temperature among the four alloys. The XRD results show that the oilquenched Ni36Al alloy possesses almost complete martensitic structures, while the oilquenched Ni-21.2Al-20Fe contains the intermetallic compounds such as Ni3Al and Ni5Al3 in addition to martensite. The internal friction peak height is related to the transformation amount per unit time and the total transformation amount is also related with transforming time that is determined by peak width.

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