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首页> 外文会议>SEM IX International Congress on Experimental Mechanics June 5-8, 2000 Orlando, Florida >Notch Strengthening in Titanium Aluminides Under Monotonic Loading
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Notch Strengthening in Titanium Aluminides Under Monotonic Loading

机译：单调加载下铝钛合金的缺口强化

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摘要

An important concern for titanium aluminides is their limited ductility and its consequences for TiAl components containing stress concentrators. In recent experiments, evidence of notch strengthening has been found in one TiAl alloy under monotonic loading. The goal of this study is to fully explore this issue through tests on two cast alloys, one with a microstructure consisting of predominantly equiaxed gamma grains and the other having a fully lamellar microstructure. Tests involve monotonic tensile loading of notched specimens at room temperature under conditions of plane stress, where the notch radii are large relative to grain size. For each material, results from the testing of three notched specimen geometries are presented and finite element models are used to interpret the test results. This includes unsing the numerical models to apply Weibull statistical methods to predict notch strengtherning in the specimens. It is shown that notch strengthening is clearly seen in both alloys tested and thus is likely to be a characteristic of TiAl Alloys in general; however, strengthening is not as great as is predicted by Weibull statistical methods.
机译：铝化钛的一个重要问题是其有限的延展性及其对包含应力集中器的TiAl组件的影响。在最近的实验中，在单调加载下，一种TiAl合金中发现了缺口强化的证据。这项研究的目的是通过对两种铸造合金的测试来全面探讨这一问题，一种合金的微观结构主要由等轴γ晶粒组成，而另一种则具有完全的层状微观结构。测试涉及在室温下在平面应力条件下缺口试样的单调拉伸载荷，其中缺口半径相对于晶粒尺寸较大。对于每种材料，均给出了三个带缺口试样几何形状的测试结果，并使用有限元模型来解释测试结果。这包括取消数值模型的应用，以应用Weibull统计方法来预测样品中的缺口强度。结果表明，在两种测试的合金中都清楚地看到了缺口强化现象，因此一般来说，这可能是TiAl合金的特征。但是，加强程度不如威布尔统计方法所预期的那样。

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