TC11钛合金中α″相和α′ 相的组织演变和显微硬度
Microstructure Evolution of α"-Phase and α'-Phase and Microhardness of TC11 Titanium Alloy
查看参考文献25篇
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文摘
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研究了TC11钛合金中α″相和α′相的显微组织转变和显微硬度。金相显微组织观察和X射线衍射分析的结果表明:随着固溶温度的提高α″相逐渐向α′ 相的晶体结构转变,α 相、α″相和α′相的显微组织演变规律为:α+α″,α+α″+α′,α+α′,α′。显微硬度测试的结果表明:在935~995℃固溶后显微硬度随着温度的提高先增大后减少,在985℃固溶后显微硬度达到峰值。综合分析显微组织影响合金显微硬度的机理:在935~985℃固溶后α′片层的厚度和间距变化的幅度小,β 转变组织长大缓慢,在β 转变组织中先后析出α″和α′相,随着固溶温度的提高α′片层的含量随之提高产生了相变强度效果,使其显微硬度提高;在985~995℃固溶后α′片层的厚度和间距明显增大,β 转变组织变粗大,α″相消失,α′相的含量降低,相变强化的效果减弱,使β 转变组织的显微硬度降低。 |
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其他语种文摘
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The effect of solution treatment temperature (STT) (ranging from 935°C to 995°C) on the microstructure evolution of α"-phase,α'-phase and microhardness of TC11 titanium alloy were investigated systematically by means of optical microscope,electron microscope with energy dispersive spectroscope,X-ray diffractometer and microhardness tester.Results show that the crystal structure of α"-phase gradually correspond to the crystal structure of the α ′ phase,and the phase composition of TC11 alloy changes with increasing STT (α+α″,α+α″ +α ′,α+α ′,α ′).Microhardness of the alloy solution treated in the temperature range from 935~985°C increased with the solution temperature,whereas the microhardness reduced for further increase of solution temperature up to the range of 985~995°C.Microstructural features resulting from different STTs were correlated with corresponding microhardness values.With the increment of STT the microhardness increased,because the thickness and spacing of α ′ -lamellae increased slowly and the β-transformed structure grew up slowly.Besides,due to phase transition strengthening(PTS) the α"-phase and α ′ -phase are precipitated in the β-transformed structure,and the α ′ -lamellae contents in the β -transformed microstructure increased,eventually reaching a maximum at 985°C.Above 985° C the microhardness decreased,because the thickness and spacing of α ′ -lamellae increased significantly and the β-transformed structure became coarser at the expense of α'-phase and α"- phase contents. |
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来源
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材料研究学报
,2019,33(6):443-451 【核心库】
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DOI
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10.11901/1005.3093.2018.474
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关键词
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金属材料
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TC11钛合金
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固溶处理
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显微组织
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显微硬度
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地址
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1.
中国科学院金属研究所, 沈阳, 110016
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中国科学技术大学材料科学与工程学院, 合肥, 230026
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中国科学院大学, 北京, 100049
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1005-3093 |
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学科
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金属学与金属工艺 |
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文献收藏号
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CSCD:6524842
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