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首页> 外文期刊>Journal of Materials Engineering and Performance >Separating the Effects of Ti_3Al and Silicide Precipitates on the Tensile and Crack Growth Behavior at Room Temperature and 593 deg C in a Near-Alpha Titanium Alloy
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Separating the Effects of Ti_3Al and Silicide Precipitates on the Tensile and Crack Growth Behavior at Room Temperature and 593 deg C in a Near-Alpha Titanium Alloy

机译：分离Ti_3Al和硅化物沉淀对室温和593摄氏度下近α钛合金的拉伸和裂纹扩展行为的影响

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摘要

Aging of silicon-bearing, near-alpha titanium alloys produces two types of precipitate, Ti_3Al and (TiZr)_6Si_3 (silicide). A postaging heat treatment that relies on the phenomenon of the critical ordering temperature is used to remove the Ti_3Al precipitate while leaving the silicide intact. Three materials- imaged (precipitate free), overaged (Ti_3Al plus silicide), and post aging heat treated (silicide only)-are compared. The objective Is to Identify the separate effects of the Ti_3Al and silicide precipitates on tensile and fatigue crack growth behavior at room temperature and 593 deg C. The Ti3Al precipitate is largely responsible for the increase in yield stress and for the decrease In ductility at both test temperatures. In contrast, the increase in room temperature fatigue crack growth rate associated with aging is attributed to the silicide, with Ti_3Al playing only a minor role. Aging produces a slight improvement in fatigue crack resistance at 593 deg C, which also appears to be due to the presence of the silicide precipitate.
机译：含硅的近α钛合金的时效产生两种类型的沉淀物，即Ti_3Al和（TiZr）_6Si_3（硅化物）。依赖于临界有序温度现象的后效热处理用于去除Ti_3Al沉淀，同时保持硅化物完整。比较了三种材料-成像（无沉淀），过时（Ti_3Al加硅化物）和后老化热处理（仅硅化物）的材料。目的是确定Ti_3Al和硅化物沉淀对室温和593℃下拉伸和疲劳裂纹扩展行为的单独影响。在两种测试中，Ti3Al沉淀主要是造成屈服应力增加和延性降低的原因温度。相反，与老化相关的室温疲劳裂纹扩展速率的增加归因于硅化物，而Ti_3Al仅起较小作用。时效在593℃时的疲劳裂纹抗性略有改善，这似乎也归因于硅化物沉淀的存在。

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