Development of new Invar-type alloys by controlling stress-induced transformation of thermoelastic martensite and its industrial application

控制热弹性马氏体应力诱导相变新型因瓦合金的开发及其工业应用

基本信息

批准号：
14102030
负责人：
ISHIDA Kiyohito
金额：
$ 70.39万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (S)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2006
项目状态：
已结题

项目摘要

It has been accepted that it is difficult to control the coefficient of thermal expansion (CTE) because it inversely proportional to the melting point of materials. This study was aimed to develop a new method of controlling the CTE using phase transformation.It is known that plastically deformed alloys undergoing thermoelastic martensitic transformation can exhibit two-way shape memory effect, which is a reversible and spontaneous shape change during heating and cooling. The effect of the pre-deformation on the reversible shape change was quantitatively investigated in this study. It was found that the transformation hysteresis increases by cold-rolling and CTE【approximately equal】0 is obtained in Cu-Zn-Al alloy cold-rolled to 9% reduction. Although the one directional rolling causes anisotropy in CTE, two-dimensional low thermal expansion (LTE) can be obtained by a cross-rolling method. Moreover, the cold-workability is drastically improved in α+β two-phase alloys, which means that C … More u-Zn-Al Invar alloys possessing high electrical conductivity are promising for practical applications.The grain size is one of the important factors to control the thermal expansion property. It was found that higher reduction is required to obtain LTE in a large grain specimen, which was thermodynamically analyzed using the Clausius-Clapeyron relationship, leading to the establishment of a method of controlling the CTE of alloys. Single crystal experiments also clarified the mechanism of the LTE obtained in these new Invar alloys.The stability of Cu-Zn-Al Invar alloys was investigated. 500 thermal cycles between-190℃ and 90℃ hardly changed the thermal expansion property, and good thermal stability up to 80℃ was confirmed. Based on the results in this study, the Cu-based Invar alloys are being examined for applications particularly to a machine part in printers.It should be noted that several interesting results related to this study, including high damping capacity, improvement of fatigue properties and superplasticity, was obtained in the Cu-Zn-Al and Cu-Al-Mn alloys. Less

人们认为，很难控制热膨胀（CTE）的核心，因为它与材料的熔点成反比。这项研究的目的是开发一种使用相变控制CTE的新方法。众所周知，经过热弹性马氏体转化的塑料变形合金可以执行双向形状的记忆效应，这是在加热和冷却过程中可逆且具有赞助的形状变化。在本研究中，对预申请对可逆形状变化的影响进行了定量研究。发现在Cu-Zn-Al合金冷卷中获得的CU-Zn-Al合金降低至9％的CU-Zn-Al合金中，转化磁滞增加了CTE [大约等于] 0。尽管一种定向滚动导致CTE的各向异性，但可以通过交叉滚动方法获得二维低热膨胀（LTE）。此外，在α+β双相合金中，冷可加工能力大大提高，这意味着c…更多具有高电导率的U-Zn-al-al-al-al-al-al-aL弹性合金有望用于实际应用。晶粒尺寸是控制热膨胀特性的重要因素之一。发现需要更高的还原才能在大型谷物标本中获得LTE，该标本是使用Clausius-Clapeyron关系进行热力学分析的，从而建立了控制合金CTE的方法。单晶实验还阐明了在这些新的不发光合金中获得的LTE的机理。研究了Cu-Zn-Al var合金的稳定性。 500在190℃至90之间的热循环几乎不会改变热膨胀特性，并且确认了良好的热稳定性高达80℃。根据这项研究的结果，正在检查基于CU的不可分化合金，特别是在打印机中的机器部件中的应用。这应该指出，在CU-ZN-AL和CU-AL和CU-AL Alloys中获得了与这项研究相关的几个有趣的结果，包括高阻尼能力，疲劳性能的改善和超塑性。较少的