本文应用X射线衍射、金相和电子探针等方法研究了Ti和Ti-6Al-4V合金在750—920℃温度范围离子氮化后的氮化层和基体组织结构。在Ti-6Al-4V合金的氮化层中,形成一层富Al并固溶氮的α′-Ti(Al,N)相,它介于氮化层和基体之间,成为一个阻挡层,阻止氮向基体扩散,改变了Ti-6Al-4V合金离子氮化的行为。 此外还发现,经离子氮化后,两种材料基体的择尤取向均发生显著变化。在板面法线方向的倒极图上,择尤取向(0001)变为(01(?)0)和(21(?)1),且试样中心比表面的取向更为集中,这可能是离子氮化工艺促成的现象。
The structures of the nitrided layer and the substrate to commercially pure Ti and Ti-6Al-4V alloy after ionitrided at 750—920℃ have been examined by X-ray diffraction, metallography and EPMA. An α'-Ti (Al,N) solid solution phase rich in Al is found between the nitrided layer and the substrate of Ti-6Al-4V alloy as an obstruction of N_2 to diffuse through the substrate, and then the ionitriding behaviour of the alloy will be alterred. It was also observed that the texture of substrate of these two ionitrided metals varied considerably. Their preferred orientation in inverse-pole-figure of normal sheet changes from (0001) to (o110) and (2131), especially concentrated in the centre part of the specimen. This seems to be the particular phenomenon owing to the ionitriding technique.
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