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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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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 using the numerical models to apply Weibull statistical methods to predict notch strengthening 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 would be predicted by Weibull statistical methods as applied to brittle materials. [References: 13]
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成分的影响。在最近的实验中，已发现一种TiAl合金在单调载荷下的缺口强化证据。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，缺口半径相对于晶粒尺寸较大的缺口试样的单调拉伸载荷。对于每种材料，均给出了三个带缺口试样几何形状测试的结果，并使用有限元模型来解释测试结果。这包括使用数值模型来应用Weibull统计方法来预测试样的缺口强度。结果表明，在两种测试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，增强作用不如Weibull统计方法所预测的那样强于脆性材料。 [参考：13]

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