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定向凝固超高强度NiTi基自生复合材料

, PP. 141-146

Keywords: NiTi合金,自生复合材料,定向凝固,热处理

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Abstract:

在NiTi合金中添加少量Al、Nb、Hf强化元素,采用定向凝固原位自生法制备了一种NiTi基自生复合材料,并在950℃对定向凝固棒分别进行了12h、50h及100h的均匀化热处理,对热处理后的试样进行了室温抗拉强度测试。结果表明,定向凝固组织为沿[001]方向生长的细小的棒状胞晶组织,β-Nb相和Ti2Ni相增强体颗粒沿NiTi胞晶间的[001]方向排列。随热处理时间的延长,胞晶尺寸逐渐粗化,两增强相粒子分布更加弥散均匀。热处理后NiTi基自生复合材料的最大抗拉强度达到1972MPa,超过了4130和8640超高强度钢,与4140和4340超高强度钢的强度基本相当,达到或超过了多种国内外现役的超高强度钛合金。

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