Abstract Effect of yttria inclusion on room temperature tensile properties of investment cast TiAl
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Effect of yttria inclusion on room temperature tensile properties of investment cast TiAl

机译：氧化钇夹杂对熔模铸造TiAl室温拉伸性能的影响

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AbstractYttria is the best face coat material in the shell mold for the investment casting of γ-TiAl alloys. However, yttria inclusions may occur in the cast products and there is a lack of knowledge about the influence of yttria inclusions on the mechanical properties of TiAl. In the present study, the effect of yttria inclusions on room temperature tensile properties of two investment cast TiAl alloys, Ti-45Al-2Mn-2Nb (at%) + 0.08vol% TiB2and Ti-46 Al-2Nb-2Cr-0.15B (at%), were studied. The results show that tensile failure tends to initiate from yttria inclusions, resulting in reduced plastic strain and ultimate strength. Yttria inclusions differ in location (surface /internal), size, and morphology (agglomerate /whole piece), those with larger sizes or located at the sample surface being more harmful. The tensile properties of inclusion containing TiAl parts can be estimated using the size and location determined by X-ray inspection. The critical size at which inclusions become detrimental to the mechanical properties of TiAl was discussed.
机译： 摘要 2 <研究了Ti-46 Al-2Nb-2Cr-0.15B（at％）。结果表明，拉伸破坏倾向于由氧化钇包裹体引发，从而导致塑性应变和极限强度降低。氧化钇夹杂物的位置（表面/内部），大小和形态（附聚物/整块）不同，较大尺寸或位于样品表面的夹杂物更有害。可以使用X射线检查确定的尺寸和位置估算含TiAl零件的夹杂物的拉伸性能。讨论了夹杂物对TiAl力学性能有害的临界尺寸。

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