焼入れTi-Cr合金の相構成, 比抵抗および硬さに及ぼすCr添加量の影響
焼入れTi-Cr合金の相構成, 比抵抗および硬さに及ぼすCr添加量の影響
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Cr添加量对淬硬Ti-Cr合金的相组成、电阻率和硬度的影响
DOI：
10.2464/jilm.55.582
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
伸也 小松
中科院分区：
文献类型：
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作者：
勝彦 池田;伸也 小松
作为开发低成本βTi合金的基础研究，研究了1173 K淬火后Ti-Cr二元合金的相组成、电阻率和维氏硬度随Cr含量的变化。在固溶淬火状态下，3Cr和5Cr合金中均出现六方马氏体α'相，而5 ~ 20 Cr合金中均出现β相。在7 Cr和10 Cr合金中也发现了非热ω。电阻率随着Cr含量的增加而增加，直到10质量% Cr，然后略有下降。在10质量% Cr以上，液氮温度下的电阻率大于室温下的电阻率。HV的最大值出现在7质量%的Cr，然后HV随Cr含量的增加而降低，直到13质量%的Cr。高于13质量%的Cr，HV由于Cr添加的固溶硬化而略微增加。从10 Cr到20 Cr合金的温度-电阻率曲线在77 K到300 K之间呈负温度依赖关系。从温度-电阻率曲线随Cr含量的变化来看，随着Cr含量的增加，非热性ω地层的起始温度降低。Ti-Cr、Ti-Fe和Ti-V合金的HV随e/a的变化趋势基本相同，但绝对值不同。
As basic study to develop low cost βTi alloys, changes in phase constitution, electrical resistivity and Vickers hardness with increase of Cr content were investigated in Ti-Cr binary alloys quenched from 1173 K. In solution treated and quenched state, hexagonal martensite, α' was identified at 3Cr and 5Cr alloys, whereas β phase was identified from 5Cr to 20Cr. In 7Cr and 10Cr alloys, athermal ω was also identified. Resistivity increased with increase of Cr content up to 10 mass% Cr and then slightly decreased. Above 10 mass% Cr, resistivity at liquid nitrogen temperature was larger than that at room temperature. Maximum of HV appeared at 7 mass% Cr and then HV decreased with increase of Cr content up to 13 mass% Cr. Above 13 mass% Cr, HV slightly increased due to solution hardening by Cr addition. Temperature-resistivity curves of alloys from 10Cr to 20Cr were negative temperature dependence between 77 K and about 300 K. From change of the temperature-resistivity curves with Cr content, it is expected starting temperature of athermal ω formation decreases with increase of Cr content. Trend of changes in HV of Ti-Cr, Ti-Fe and Ti-V alloys as a function of e/a was the almost same, though absolute these values of the three alloys are not same.