| 硼对Ni-46Ti-4Al合金微观组织和力学性能的影响 |
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| 引用本文： | 李涛,李岩,宋晓云,李树索.硼对Ni-46Ti-4Al合金微观组织和力学性能的影响[J].稀有金属,2011,35(3). |
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| 作者姓名： | 李涛 李岩 宋晓云 李树索 |
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| 作者单位： | 北京航空航天大学材料科学与工程学院空天材料与服役教育部重点实验室,北京,100191 |
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| 摘 要： | 采用电子探针、透射电镜和X射线衍射方法研究了添加微量B元素(0～1%)(质量分数)对Ni-46Ti-4Al合金微观组织的影响,并采用力学压缩试验测试了合金的室温和高温力学性能.结果表明,Ni-46Ti-4Al合金由NiTi基体和(Ti,Al)<,2>Ni两相组成.添加微量B元素(0.02%)可以促使Ni-46Ti-4Al合金中出现TiB<,2>化合物,且与(Ti,Al)<,2>Ni相都在晶界上析出.随着B含量增加,(Ti,Al)<,2>Ni相逐渐减少,TiB<,2>相逐渐增多.这两相的硬度均高于NiTi基体相,是合金中的强化相.添加适量的B可以显著提高Ni-46Ti-4Al合金的室温和高温屈服强度,例如:添加l%B合金的室温屈服强度达到2553 MPa,比Ni-46Ti-4Al合金提高了128%.添加0.02%B和1%B合金在600℃时的屈服强度分别为382和498 MPa,比Ni-46Ti-4Al合金提高了35%和70%.合金屈服强度和两个强化相((Ti,Al)<,2>Ni和TiB<,2>相)的总体积分数成正比.B加入后一方面使Ni-46Ti-4Al合金得到固溶强化,另一方面,还促使生成具有强化作用的TiB<,2>相,这是合金室温和高温屈服强度提高的主要原因.
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| 关 键 词： | NiTiAl合金 微观结构 力学性能 硼 微合金化 |
Effect of Boron on Microstructures and Mechanical Properties of Ni-46Ti-4Al Alloy |
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| Li Tao,Li Yan,Song Xiaoyun,Li Shusuo.Effect of Boron on Microstructures and Mechanical Properties of Ni-46Ti-4Al Alloy[J].Chinese Journal of Rare Metals,2011,35(3). |
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| Authors: | Li Tao Li Yan Song Xiaoyun Li Shusuo |
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| Affiliation: | Li Tao,Li Yan,Song Xiaoyun,Li Shusuo (Key Laboratory of Aerospace Materials and Performance(Ministry of Education),School of Materials Science and Engineering,Beihang University,Beijing 100191,China) |
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| Abstract: | The effects of B(0~1%) addition on the microstructure Ni-46Ti-4Al alloy were studied through electron probe microanalysis(EPMA),transmission electron microscopy(TEM) measurement and X-ray diffraction(XRD),and the mechanical properties of the alloys were investigated by compressive tests at room and elevated temperatures.The results indicated that Ni-46Ti-4Al alloy was composed of NiTi matrix and(Ti,Al)2Ni phase.TiB2 compounds were precipitated by adding a small quantity of B(0.02%) and existed in the grain ... |
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| Keywords: | NiTiAl alloy microstructure mechanical properties boron micro-alloying |
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