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首页> 外文会议>Symposium Proceedings vol.842; Symposium on Integrative and Interdisciplinary Aspects of Intermetallics; 20041129-1201; Boston,MA(US) >Fatigue Testing of microsized samples of γ-TiAl based material
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Fatigue Testing of microsized samples of γ-TiAl based material

机译：γ-TiAl基材料的微型样品的疲劳测试

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摘要

High strength γ-TiAl based alloys, such as Ti-46Al-5Nb-1W (Alloy 7), which were originally developed for gas turbine and automotive applications are now being considered for application in Micro Electro Mechanical Systems (MEMS). This requires the evaluation of these materials upon the microscale. As international standards do not currently exist for the evaluation of the mechanical properties of samples with dimensions equivalent to those required by MEMS devices, the development of new methods was required. The method developed here is intended for the fatigue testing of samples measuring ≈ 10μm (B) x 20μm (W) x 40μm (L). This is completed using a machine recently developed at Tokyo Institute of Technology to load samples of lamellar γ-TiAl based material to failure in compressive bending. This method is intended to work alongside methods previously developed for the fracture toughness testing of similar microsized cantilever bend specimens. In this work sample cantilevers of Alloy 7 are Focussed Ion Beam (FIB) machined from foil ≈ 20μm thick and their stress - life (S-N) fatigue behaviour evaluated. The dependence of fatigue life upon lamellar orientation for a given peak stress / stress range is considered. The effect of the reduced scale of these samples upon the mean and scatter of these sample lifetimes is also considered through comparison with previous data obtained from the S-N testing of macrosized samples of the same material.
机译：高强度的基于γ-TiAl的合金，例如Ti-46Al-5Nb-1W（合金7），最初是为燃气轮机和汽车应用开发的，现在正考虑在微机电系统（MEMS）中应用。这就需要在微观上评估这些材料。由于目前尚不存在评估尺寸与MEMS器件所需尺寸相等的样品力学性能的国际标准，因此需要开发新方法。这里开发的方法旨在用于测量≈10μm（B）x20μm（W）x40μm（L）的样品的疲劳测试。这是使用东京工业大学最近开发的机器完成的，该机器将片状γ-TiAl基材料的样品加载到压缩弯曲失败的状态。该方法旨在与先前开发的用于类似尺寸的悬臂弯曲试样的断裂韧性测试的方法一起使用。在这项工作中，合金7的悬臂样品由厚度约20μm的铝箔加工而成的聚焦离子束（FIB），并评估了它们的应力-寿命（S-N）疲劳行为。对于给定的峰值应力/应力范围，考虑了疲劳寿命对片状取向的依赖性。通过与从相同材料的大尺寸样本的S-N测试获得的先前数据进行比较，还可以考虑减小样本规模对这些样本寿命的平均值和离散度的影响。

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