Development of Ti-Pd-Ni High Temperature Shape Memory Alloys

要改进Ti_<50>Pd_&lt;50-x&gt; Ni_x（0&lt;=x&lt;=50）高温形状内存特性，各种实验已被带走，并得到了后续结果。（1）一种新的装置，以评估高温形状存储器特性已经开发出来，并使不同的变换器有效地消除了系统各部分的热扩展的影响。还有一些问题在开始时被发现，而这些问题被使用石英玻璃棒以非常低的热扩展来检测特异性的线条。（2）发现B对上方的芦荟的补充是有效的，以抑制谷物的生长，并导致芦荟的生长的结果增加。TiB_2的预期准确度也是真实的，但其尺寸太大，无法有效。The large grain growth of TiB_2 precipitates were found to originate in the homogenization annealing prosess.哦，是的，同源性治疗在以后就消失了。 ... More （3）由于TiB_2的预处理困难并不有效，另一种预处理困难也被尝试过。i.e. Ti的组成从Ti_Pd_Ni_的分子量中改变<50><30>了<20>。作为一个结果，找到了一种方法，可以有效地引入另一个食谱。（4）从Ti_<50>Pd_<30>Ni_<20>alloys开始， 4种类型的alloys with B addition， Ti-rich from stoichiometry， and the compbination of both， were prepared。然后，作为对成分和热治疗的尊重的优化实验的结果，高温形状存储器特性已经找到了最好的适合在Ti丰富方面的合金，在773 K的热治疗为1小时。（5） Very interesting results were obtained on the recovery·recrystalliization of the alloys。i. e. The recovery &amp; reccrystalliization被发现是由前一代跟随的反向转变来控制的。（6）非常有趣的现象在人类状态中发现了这样的反应性异常现象。However，这意味着，在一个敏感的状态下，还原成为一个因素来确定芳香的上温度限制。（7）循环实验是用上面的新设备完成的。However，循环实验在过去的一年里继续进行，自从实验在时间上花费很大（i.e.10h/specimen）。Less（低）

To improve the shape memory characteristics of Ti_<50>Pd_<50-x>Ni_x (0<=x<=50) high temperature shape memory alloys, various experiments were carried out, and the following results were obtained. (1) A new apparatus to assess high temperature shape memory characteristics was developed, utilizing differential transformers to avoid the effect of thermal expansion of various parts of the system. Although some troubles were encountered at the beginning, the troubles were eliminated by using quartz glass rods with very low thermal expansion to detect the strains of specimens. (2) The addition of B to the above alloys were found to be effective to prohibit grain growth, and to the resultant increase of elongation of the alloys. The expected precipitates of TiB_2 were also realized, but the size was too large to be effective. The large grain growth of TiB_2 precipitates were found to originate in the homogenization annealing prosess. Thus, the homogenization treatment was avoided thereafter. … More (3) Since the precipitation hardening of TiB_2 was not effective, another type of precipitation hardening was tried. i.e.the composition of Ti was changed from the stoichiometry of Ti_<50>Pd_<30>Ni_<20>. As a result, the method was found to be effective with introduction of another precipitates. (4) Starting from Ti_<50>Pd_<30>Ni_<20> alloys, 4 types of alloys with B addition, Ti-rich from stoichiometry, and the combination of both, were prepared. Then, as a result of optimization experiment with respect to composition and heat-treatment, the high temperature shape memory characteristics were found to be best for the alloy on Ti-rich side, which were heat-treated at 773K for 1h. (5) Very interesting results were obtained on the recovery・recrystallization of the alloys. i.e. The recovery・recrystallization was found to be controlled by the reverse transformation such that the former follows the latter. (6) Very interesting phenomenon was found such that recrystallization occurs in the martensitic state. However, this means that the recrystallization in the martensitic state becomes one factor determining the upper temperature limit of the alloys. (7) Cyclic experiments are being done using the above new apparatus. However, the cyclic experiments are to be continued in the following year, since the experiments are very time-consuming (i.e.10h/specimen). Less