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| 硼和超声波对Ti42Al6Nb2.6C0.8Ta合金组织性能耦合作用机制研究 |
| Study on the Coupling Mechanism of Boron and Ultrasonic on the Microstructure and Properties of Ti42Al6Nb2.6C0.8Ta Alloy |
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| DOI：10.3969/j.issn.1674-6457.2022.11.003 |
| 中文关键词: TiAl合金 超声处理 硼化物 组织演变 力学性能 |
| 英文关键词: TiAl alloy ultrasound treatment boride microstructure evolution mechanical properties |
| 基金项目:国家自然基金青年基金(52101038);国家自然科学基金(51825401);黑龙江省国家自然科学基金(LH2020E031);黑龙江省博士后科学基金(LBH?Z19154) |
| Author Name | Affiliation | | CHEN Rui-run | School of Materials Science and Engineering, Shandong University of Science and Technology, Shandong Qingdao 266500, China
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China | | ZHOU Ling-yan | School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China | | FANG Hong-ze | School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China | | YANG Xiao-kang | School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China | | DING Hong-sheng | School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China | | GUO Jing-jie | School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China |
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| 中文摘要: |
| 目的 为了揭示超声辅助熔铸下硼(B)和超声波的耦合细化机制及其强化机制，研究Ti42Al6Nb2.6C0.8Ta‒xB合金的相组成、片层团尺寸、元素分布、析出相的种类和形貌、压缩性能及相应机制。方法 在氩气气氛保护下用真空非自耗电弧对合金进行熔炼，然后通过超声设备重熔引入超声波，超声电流恒定，超声作用时间为100 s。随后对合金组织进行扫描电镜观察和相组成分析，并测试其室温压缩性能。结果 TiAl合金中硼化物的种类和含量得到了调控，片层团尺寸从30.3 μm降低到16.6 μm，β稳定元素的偏析减少，B2相含量降低。合金压缩性能大幅度提高，压缩强度从1 701 MPa增加到2 176 MPa，压缩率从25.5 %增加到32.6 %。结论 B元素引起的成分过冷、异质形核质点的增加和超声波对初生相的破碎三者共同作用，细化了合金的组织。显微组织细化、Nb和Ta的固溶、棒状硼化物含量的增加和B2相含量的降低是压缩性能提高的主要原因。 |
| 英文摘要: |
| The work aims to reveal the refining mechanism and strengthening mechanism of B and ultrasonic coupling under ultrasonic assisted melting and casting, the phase composition, lamellar colony size, elements distribution, the type and morphology of precipitated phase, compressive properties and corresponding mechanism of Ti42Al6Nb2.6C0.8Ta-xB alloys were studied. Vacuum non-consumable arc was used for melting under the protection of argon atmosphere, and then ultrasonic waves were introduced by remelting with ultrasonic equipment, the ultrasonic current was constant, and the ultrasonic action time was 100 s. Then the microstructure of the alloy was observed by scanning electron microscopy and the phase composition was analyzed, and the compressive properties of the alloy were tested at room temperature. The results show that the kind and content of borides in TiAl are adjusted, the lamellar colony size decreases from 30.3 μm to 16.6 μm. The segregation of β-stable elements is reduced and the content of B2 phase is reduced. The compressive properties of the alloy are greatly improved, the compressive strength increases from 1 701 MPa to 2 176 MPa and the compressive rate increases from 25.5% to 32.6%. The component supercooling caused by B element, the increase of heterogeneous nucleation, and the breaking of the primary phase by ultrasound, all of which work together to refine the microstructure of the alloy. The refinement of microstructure, the solid solution of Nb and Ta, the increase of rod borides content and the decrease of B2 phase content are the main reasons for improving the compression properties. |
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