不同错配度的 TiN/α-Fe 界面对氢扩散的影响

王 　恒, 索进 平*
华中科技大学

摘要

在钢中加入弥散的 Na-Cl 结构的析出相，可以有效地阻止氢原子的扩散，抑制氢脆。然而，目前关于析出
物对氢扩散影响的研究大多集中在碳化物相界面，对氮化物相界面的研究较少。因此，我们研究了 TiN 和 α-Fe 之
间的共格、半共格和非共格界面对氢扩散的影响。我们通过高分辨率透射电子显微镜观察，揭示了 TiN/α-Fe 三个界
面的位向关系、原子排列和错配度，并发现 TiN/α-Fe 的共格、半共格和非共格界面的位向关系分别是 (200)TiN//(200)
α-Fe 和 [001]TiN // [011]α-Fe; (200)TiN // (110)α-Fe 和 [001]TiN //[011]α-Fe; 以及 (200)TiN //(122)α-Fe 和 [011]TiN //[111]α-Fe。当样品
包含最多的 TiN/α-Fe 共格界面时，氢扩散系数最低。因此，我们的分析表明，TiN/α-Fe 界面处的弹性畸变能可以
阻碍促进氢原子在材料中的扩散。

关键词

氢扩散；TiN；HRTEM；界面

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