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  • 您现在的位置:首页> 外文会议>Conference on Active Materials: Behavior and Mechanics; 20060227-0302; San Diego,CA(US) >亿博帐号注册详情

    【24h】Properties of a Ni_(19.5)Pd_(30)Ti_(50.5) high-temperature shape memory alloy in tension and compression

    机译Ni_(19.5)Pd_(30)Ti_(50.5)高温形状记忆合金的拉伸和压缩性能

    【摘要】Potential applications involving high-temperature shape memory alloys have been growing in recent years. Even in those cases where promising new alloys have been identified, the knowledge base for such materials contains gaps crucial to their maturation and implementation in actuator and other applications. We begin to address this issue by characterizing the mechanical behavior of a Ni_(19.5)Pd_(30)Ti_(50.5) high-temperature shape memory alloy in both uniaxial tension and compression at various temperatures. Differences in the isothermal uniaxial deformation behavior were most notable at test temperatures below the martensite finish temperature. The elastic modulus of the material was very dependent on strain level; therefore, dynamic Young's Modulus was determined as a function of temperature by an impulse excitation technique. More importantly, the performance of a thermally activated actuator material is dependent on the work output of the alloy. Consequently, the strain-temperature response of the Ni_(19.5)Pd_(30)Ti_(50.5) alloy under various loads was determined in both tension and compression and the specific work output calculated and compared in both loading conditions. It was found that the transformation strain and thus, the specific work output were similar regardless of the loading condition. Also, in both tension and compression, the strain-temperature loops determined under constant load conditions did not close due to the fact that the transformation strain during cooling was always larger than the transformation strain during heating. This was apparently the result of permanent plastic deformation of the martensite phase with each cycle. Consequently, before this alloy can be used under cyclic actuation conditions, modification of the microstructure or composition would be required to increase the resistance of the alloy to plastic deformation by slip.

    【摘要机译】近年来,涉及高温形状记忆合金的潜在应用正在增长。即使在已经鉴定出有前途的新合金的情况下,此类材料的知识库也包含了对于它们的成熟以及在执行器和其他应用中的实现至关重要的空白。我们通过表征Ni_(19.5)Pd_(30)Ti_(50.5)高温形状记忆合金在不同温度下的单轴拉伸和压缩的力学行为来解决这个问题。在低于马氏体终点温度的测试温度下,等温单轴变形行为的差异最为明显。材料的弹性模量非常取决于应变水平。因此,通过脉冲激励技术确定了动态杨氏模量随温度的变化。更重要的是,热激活致动器材料的性能取决于合金的功输出。因此,在拉伸和压缩下都确定了Ni_(19.5)Pd_(30)Ti_(50.5)合金在各种载荷下的应变温度响应,并计算了两种载荷条件下的比功输出并进行了比较。已发现,不管加载条件如何,相变应变以及因此的比功输出都是相似的。同样,在拉伸和压缩中,在恒定负载条件下确定的应变-温度环路由于冷却期间的变形应变总是大于加热期间的变形应变而没有闭合。这显然是每个循环马氏体相永久塑性变形的结果。因此,在该合金可以在循环驱动条件下使用之前,需要改变其微观结构或组成,以增加合金对滑移引起的塑性变形的抵抗力。

    【作者】Ronald Noebe;Santo Padula; II;Glen Bigelow;Orlo Rios;Anita Garg;Brad Lerch;

    【作者单位】NASA Glenn Research Center, Materials & Structures Division, Clevel, OH 44135;

    【年(卷),期】2006(),

    【年度】2006

    【页码】P.617010.1-617010.13

    【总页数】13

    【原文格式】PDF

    【正文语种】eng

    【中图分类】TB30;

    【关键词】high-temperature shape memory alloy;NiTiPd;tensile properties;compression;specific work output;shape memory behavior;dynamic modulus;transformation strain;transformation temperatures;

    机译 高温形状记忆合金; NiTiPd;拉伸性能;压缩;比功输出;形状记忆行为;动态模量;相变应变;相变温度;
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