Ti-22Al-23Nb-1Mo-1Zr合金环锻件组织演变及力学行为
Microstructure evolution and mechanical behavior of Ti-22Al-23Nb-1Mo-1Zr alloy ring forging
查看参考文献34篇
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文摘
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以五元系Ti_2AlNb合金Ti-22Al-23Nb-1Mo-1Zr(原子分数/%)环锻件为研究对象,借助扫描电子显微镜(SEM)、透射电子显微镜(TEM)和力学性能检测设备,研究合金在不同固溶温度(850,880,900℃)+750℃时效处理工艺下的组织演变、拉伸性能及断裂行为。结果表明:固溶处理后,随固溶温度的增加,细片层O相易固溶于B2相基体中,粗片层O相逐渐粗化,O相体积分数下降;后经时效处理后,有少量细片层O相从B2相基体中析出,粗片层O相进一步粗化,O相体积分数趋于一致;合金强度随固溶温度增加呈下降趋势,而塑性呈上升趋势;拉伸断口形貌为典型解理和韧窝混合断裂的准解理特征,纵向断口存在微裂纹、滑移特征以及沿拉伸方向伸长的弯曲片层O相;位错在B2/O相界塞积,片层O相尺寸细小,能够有效减小位错滑移距离,使得合金强化作用较强。 |
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其他语种文摘
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The microstructure evolution,tensile properties and fracture behavior of five-element Ti_2AlNb alloy Ti-22Al-23Nb-1Mo-1Zr (atom fraction/%)ring forging at different solution temperatures of 850,880,900℃and 750℃aging treatment(AT)were studied by scanning electron microscope(SEM),transmission electron microscopy(TEM)and mechanical testing machines.The results show that with the increase of solution temperature,the fine lamellar O phase is more soliddissolved into the B2phase matrix,the coarse lamellar O phase gradually becomes coarser and the volume fraction of O phase decreases after solution treatment(ST).After ST+AT,a very small amount of fine lamellar O phase precipitates from the B2 phase matrix at a higher solution temperature,coarse lamellar O phase is coarsened,the volume fraction of O phase tends to be the same.The tensile strength of the alloy decreases,while the ductility increases with the increase of solution temperature.The tensile fracture morphology is a quasi cleavage characteristic of typical cleavage and dimple mixed fracture.There are microcracks,slip characteristics and the bending O phase elongated along tensile direction in the longitudinal fracture.Dislocations distribute along the B2/O phase boundary.The small size of the lamellar O phase can effectively reduce the dislocation slip distance,resulting in strong strengthening effect. |
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来源
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材料工程
,2022,50(4):147-155 【核心库】
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DOI
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10.11868/j.issn.1001-4381.2021.000590
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关键词
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Ti-22Al-23Nb-1Mo-1Zr合金
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固溶温度
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组织演变
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拉伸性能
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断裂行为
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地址
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中国航发北京航空材料研究院, 先进钛合金航空重点实验室, 北京, 100095
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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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1001-4381 |
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学科
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金属学与金属工艺 |
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基金
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国家重大科技专项
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中国航发自主创新专项资金项目
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文献收藏号
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CSCD:7208415
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