罗倩,李建崇,朱郎平,等.Ti3Al合金中α2相的比例及分布特征对其力学性能的影响[J].精密成形工程,2018,10(3):12-17.
LUO Qian,LI Jian-chong,ZHU Lang-ping,et al.Influences of Volume Fraction and Distribution Characteristics of α2 Phase in Ti3Al Alloy on Mechanical Properties[J].Journal of Netshape Forming Engineering,2018,10(3):12-17. |
| Ti3Al合金中α2相的比例及分布特征对其力学性能的影响 |
| Influences of Volume Fraction and Distribution Characteristics of α2 Phase in Ti3Al Alloy on Mechanical Properties |
| 投稿时间：2018-03-28 修订日期：2018-05-10 |
| DOI：10.3969/j.issn.1674-6457.2018.03.003 |
| 中文关键词: Ti3Al合金 热处理 微观组织特征 动态力学性能 |
| 英文关键词: Ti3Al alloy heat treatment microstructure characteristics compressive properties |
| 基金项目:国家自然科学基金(51571033) |
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| 摘要点击次数: 4400 |
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| 中文摘要: |
| 目的 优化Ti3Al合金的塑性，促进此类合金的应用。方法 采用扫描电镜及分离式霍普金森压杆系统对Ti3Al合金中α2相的比例、形状及尺寸等微观组织进行观察及动态力学性能的测试，并分析了组织变化对其动态力学性能的影响及影响机理。结果 经固溶热处理后，Ti-24Al-14Nb合金中初生α2相的相比例从47.5%增加到56.8%，α2相板条逐渐长大、变宽；固溶+时效热处理后，合金中鱼鳞状的初生α2相向板条集束状的α2相转变，粗大的初生α2相板条间析出大量细小的针叶状次生α2相。B2相中Al元素含量的下降，Al元素与B2相的固溶强化作用减弱，导致B2相的强度下降，塑性提高。同时微观组织细化，会增加合金中α2相和B2相在压缩变形过程的变形协调性，使得合金塑性明显提高。结论 固溶时效可以改善和提升Ti3Al合金的塑性。 |
| 英文摘要: |
| The paper aims to optimize the plasticity and promote the application of Ti3Al alloy. Microstructures such as proportion, shape and dimension of α2 phase in Ti3Al alloy were observed and the dynamic mechanical properties were tested with scanning electron microscope and Split Hopkinson Pressure Bars System. Influences of structural change on dynamic mechanical properties and the influence mechanism were analyzed. After solid solution heat treatment, the phase proportion of primary α2 phase in Ti-24Al-14Nb alloy increased from 47.5% to 56.8%; plate of α2 phase grew up and became wider; after solid solution + aging heat treatment, plate of cataphracted primary α2 phase in alloy changed to plate bundling shape; a large number of tiny needle shaped secondary α2 phase separated from large plate of primary α2 phase. Al element in B2 phase decreased. The solution strengthening effect between Al element and B2 phase was weaken, resulting strength decrease of B2 phase and increase of plasticity. Meanwhile, refinement of microstructure would increase the transformation harmony of α2 phase and B2 phase in alloy during compressive deformation. Solid solution and aging can improve and enhance the plasticity of Ti3Al alloy effectively. |
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