Development of High Performance Copper-base Shape Memory Alloys by means of Rapid Solidification.

Although铜基形状存储器合金（SMA）具有较大的潜力，将使用与Ni-TiSMA相比的新功能材料的较低价格，其应用似乎是受常规多晶体管材料限制的原因，即在硬颗粒结构的情况下具有较低的导电性，这些合金系统的固有特性可能是什么？目前的调查已经产生，以改善Cu-Al-Ni中的导电性MnSMA by grain refinement using a rapid solidification techniques与powder metallurgy（P/M）方法组合。在同一时间，它也是用P/M方法开发SMA控制转化温度的技术方法的。是哪一个人将两种标准合金与确定的转变温度混合在一起的，发现了1%Ti和0.2%的补充剂V至4032 III合金是由关西大学研究小组开发的，在RSP-P/M准备的特定样品中，在3-4<mu>米后退火30分钟至900 ° C。这些特别节目展示了一个相当好的SM效果，并带来了一个很好的热和冷的变形能力。However，发现的转化温度是有影响力的，有可能导致谷物大小的顺序，而良好的是化合物的精细分布，这是一个重要的作用来限制谷物生长在退火期间的一个重要的作用。使用RSP-P/M两个先前准备好的RSP来控制SAM的转换温度的方法，其中有一个明确的转换温度。这些特别节目展示了SEM分形的老化导电性。

Although Cu-base shape memory alloys (SMA) have the large potential to be used as new functional materials owing to a lower price compared with that of the Ni-Ti SMA, the application seems to be limited by the reason that ordinary polycrystalline materials have a rather low ductility in case of a coarse grain structure, which may be an inherent property of these alloy systems.The present investigation has been carried out to improve a ductility in Cu-Al-Ni-Mn SMA by grain refinement using a rapid solidification techniques combined with powder metallurgy(P/M) method. At the same time, it has been also made to develope the technological method of controlling transformation temperatures of SMA by P/M method, which consists of mixing the two kinds of standerd alloys with the definite transformation temperature.It was found that the addition of 1% Ti and 0.2%V to 4032III alloy developed by the research group of Kansai University was most effective to obtain the small grain size such as 3-4 <mu> m even after annealing for 30 min at 900゜C in the specimen prepared by RSP-P/M. These specimens showed a fairly improved hot and cold deformability together with a good SM effect. However, the transformation temperatures were found to be affected considerably due to the grain size with the order of several micron metres as well as the fine distribution of the compounds, which plays an important role for restriction to grain growth during annearing. The method of controlling the transformation temperatures of SAM has been established by RSP-P/M using the two previously prepared RSP, which has the difinit transformation temperature. These specimen showed to have agood ductility by SEM fractograpy.