An Ultra-high-strength Ti-Al-V-Mo-Nb-Zr Alloy Designed from Ti-6Al-4V Cluster Formula

被引：0
|
作者：
Chen Z. [1 ]
Zhu Z. [1 ]
Song M. [1 ]
Zhang S. [2 ]
Liu T. [3 ]
Dong C. [1 ,2 ]
机构：
[1] Key Laboratory of Materials Modification, Ministry of Education, University of Technology, Dalian
[2] School of Materials Science and Engineering, Dalian Jiaotong University, Dalian
[3] Shenyang Research Institute of Foundry Co., Ltd., State Key Laboratory of Light Alloy Casting Technology for High-End Equipment, Shenyang
来源：
Cailiao Yanjiu Xuebao/Chinese Journal of Materials Research | 2023年 / 37卷 / 04期
关键词：
cluster formula; mechanical properties; metallic materials; Ti-Al-V-Mo-Nb-Zr; titanium alloy;
D O I：
10.11901/1005.3093.2022.232
中图分类号：
学科分类号：
摘要：
The near-α dual-phase Ti-Al-V-Mo-Nb-Zr alloy series were designed and prepared by copper-mold suction casting in this paper. Their compositions fall within the composition framework previously determined for Ti-6Al-4V: the α and β formulas satisfy the ratio of 12:5, but the β part can be further stabilized, by using multi-element alloying and especially by varying the addition amount of Zr, into the form of [Al-Ti14-xZrx](Mo0.6Nb0.2V1.2Al), x = 0.6~3. The as-cast alloys are all characterized by a basket-weave microstructure containing a large number of α' martensite needles. With increasing Zr content the α' needles are gradually refined, and the strength and hardness increase accordingly. Among them a Ti-6.7Al-2.2V-2.1Mo-0.7Nb-10.0Zr alloy achieves the ultra-high strength level, with the ultimate tensile strength of 1404 MPa and Vickers-hardness of 451HV, close to the typical ultra-high-strength β-21s after heat-treatment. In comparison with Ti-6Al-4V prepared in the identical conditions, the strength and hardness of this alloy exceeds those of Ti-6Al-4V by 52% and 39%, and the specific strength and hardness are increased by 45% and 33% respectively. © 2023 Chinese Journal of Materials Research. All rights reserved.
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页码：308 / 314
页数：6
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