基于<strong>Ti-6Al-4V</strong>团簇式设计的超高强<strong>Ti-Al-V-Mo-Nb-Zr</strong>合金

doi:10.11901/1005.3093.2022.232

材料研究学报

2023, Vol. 37

Issue (4): 308-314 DOI: 10.11901/1005.3093.2022.232

研究论文

本期目录 | 过刊浏览

基于Ti-6Al-4V团簇式设计的超高强Ti-Al-V-Mo-Nb-Zr合金

陈志鹏¹, 朱智浩¹, 宋梦凡¹, 张爽², 刘田雨³, 董闯¹^,²(

)

^1.大连理工大学三束材料改性教育部重点实验室大连 116024
^2.大连交通大学材料科学与工程学院大连 116028
^3.沈阳铸造研究所有限公司高端装备轻合金铸造技术国家重点实验室沈阳 110022

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

CHEN Zhipeng¹, ZHU Zhihao¹, SONG Mengfan¹, ZHANG Shuang², LIU Tianyu³, DONG Chuang¹^,²(

)

^1.Key Laboratory of Materials Modification, Ministry of Education, University of Technology, Dalian 116024, China
^2.School of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116028, China
^3.Shenyang Research Institute of Foundry Co., Ltd., State Key Laboratory of Light Alloy Casting Technology for High-End Equipment, Shenyang 110022, China

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摘要:

设计并用真空铜模吸铸制备了近α型双相Ti-Al-V-Mo-Nb-Zr合金系列，其成分框架满足Ti-6Al-4V的α+β双相团簇式，即α和β相团簇式的比例为12:5。同时，通过多元合金化尤其是改变Zr含量，可将后者改造成具有更高β稳定性的形式[Al-Ti_14-_x Zr _x ](Mo_0.6Nb_0.2V_1.2Al)，x=0.6~3。这些合金的铸态组织其特征为网篮状，并含有大量针状α'马氏体。随着Zr含量的提高这些合金的晶粒细化，其强度和硬度也随之提高，Zr含量最高的Ti-6.7Al-2.2V-2.1Mo-0.7Nb-10.0Zr合金达到超高强水平，其铸态的拉伸强度为1404 MPa，维氏硬度为451HV，与热处理后的典型超高强钛合金β-21S的性能接近，与在相同条件下制备的Ti-6Al-4V相比其强度和硬度分别提高52%和39%，比强度和比硬度分别提高45%和33%。

关键词 ：金属材料, 钛合金, Ti-Al-V-Mo-Nb-Zr, 团簇式, 力学性能

Abstract：

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-Ti_14-_x Zr _x ](Mo_0.6Nb_0.2V_1.2Al), 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.

Key words： metallic materials titanium alloy Ti-Al-V-Mo-Nb-Zr cluster formula mechanical properties

收稿日期: 2022-04-24

ZTFLH:

TG146.2+3

基金资助:军委科技委2020年重点基础研究项目(2020JCJQZD165);大连市科技创新基金重点学科重大课题(2020JJ25CY004)

通讯作者: 董闯，教授, dong@dlut.edu.cn，研究方向为材料的原子结构模型及成分设计

Corresponding author: DONG Chuang, Tel:13998578449, E-mail: dong@dlut.edu.cn

作者简介: 陈志鹏，男，1996年生，硕士生

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引用本文:

陈志鹏, 朱智浩, 宋梦凡, 张爽, 刘田雨, 董闯. 基于Ti-6Al-4V团簇式设计的超高强Ti-Al-V-Mo-Nb-Zr合金[J]. 材料研究学报, 2023, 37(4): 308-314.
CHEN Zhipeng, ZHU Zhihao, SONG Mengfan, ZHANG Shuang, LIU Tianyu, DONG Chuang. An Ultra-high-strength Ti-Al-V-Mo-Nb-Zr Alloy Designed from Ti-6Al-4V Cluster Formula. Chinese Journal of Materials Research, 2023, 37(4): 308-314.

链接本文:

https://www.cjmr.org/CN/10.11901/1005.3093.2022.232 或 https://www.cjmr.org/CN/Y2023/V37/I4/308

图1 室温拉伸试样

表1 Ti-6Al-4V和Ti-Al-V-Mo-Nb-Zr团簇式、质量百分比、当量以及估算的固液区间

图2 Zr含量不同的Ti-Al-V-Mo-Nb-Zr合金的光学形貌组织

表2 不同Zr含量的铸态Ti-Al-V-Mo-Nb-Zr合金的原始晶粒和α'马氏体的尺寸

图3 不同Zr含量的Ti-Al-V-Mo-Nb-Zr铸态合金的SEM照片

图4 不同Zr含量的铸态Ti-Al-V-Mo-Nb-Zr合金的XRD衍射谱

图5 Ti-Al-V-Mo-Nb-Zr 合金的室温拉伸性能

图6 铸态Ti-Al-V-Mo-Nb-Zr 合金与国内外超高强度[4,5]和近α钛合金[3]室温拉伸性能的对比

图7 Ti-Al-V-Mo-Nb-Zr 合金的维氏硬度和密度以及比硬度(硬度/密度)和比强度(抗拉强度/密度)

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