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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

热膨胀系数（CTE）与材料的熔点成反比，因此难以控制。本研究的目的是发展一种利用相变控制热膨胀系数的新方法，已知塑性变形合金在热弹性马氏体相变过程中会表现出双向形状记忆效应，即在加热和冷却过程中可逆的、自发的形状变化。定量研究了预变形对可逆形变的影响。结果表明，冷轧使Cu-Zn-Al合金的相变滞后增大，当冷轧压下量为9%时，合金的热膨胀系数（CTE）约为0。虽然单向轧制导致CTE的各向异性，但可以通过交叉轧制方法获得二维低热膨胀（LTE）。此外，α+β两相合金的冷加工性能得到了显著改善，这意味着C ...更多信息 U-Zn-Al因瓦合金具有良好的导电性能，晶粒尺寸是影响其热膨胀性能的重要因素之一。结果发现，需要更高的减少，以获得LTE在一个大晶粒试样，这是使用Clausius-Clapeyron关系进行了分析，从而建立了一种方法来控制合金的CTE。单晶实验也阐明了这些新型因瓦合金获得长余辉的机理，研究了Cu-Zn-Al因瓦合金的稳定性。在-190 ℃ ~ 90℃范围内热循环500次后，其热膨胀性能基本不变，在80℃以下具有良好的热稳定性。基于本研究的结果，铜基因瓦合金正在研究中的应用，特别是在打印机中的机器部件。应该注意的是，一些有趣的结果与本研究有关，包括高阻尼能力，改善疲劳性能和超塑性，在Cu-Zn-Al和Cu-Al-Mn合金中获得。少