<strong>7075-TiB<sub>2</sub></strong> 复合材料的制备和性能

doi:10.11901/1005.3093.2024.444

材料研究学报

2025, Vol. 39

Issue (9): 683-693 DOI: 10.11901/1005.3093.2024.444

研究论文

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7075-TiB₂ 复合材料的制备和性能

颉芳霞¹^,²(

), 吴光庆¹, 张世文³, 卢泽异¹, 牟彦铭¹^,², 何雪明¹^,²

^1.江南大学机械工程学院无锡 214122
^2.江苏省食品先进制造装备技术重点实验室无锡 214122
^3.无锡锡钻地质装备有限公司无锡 214413

Preparation and Performance of a Novel Al-alloy Based Composite 7075-TiB₂

XIE Fangxia¹^,²(

), WU Guangqing¹, ZHANG Shiwen³, LU Zeyi¹, MU Yanming¹^,², HE Xueming¹^,²

^1.School of Mechanical Engineering, Jiangnan University, Wuxi 214122, China
^2.Key Laboratory of Advanced Food Manufacturing Equipment and Technology, Wuxi 214122, China
^3.Wuxi Xizuan Geological Drilling Equipment Co., Ltd., Wuxi 214413, China

引用本文:

颉芳霞, 吴光庆, 张世文, 卢泽异, 牟彦铭, 何雪明. 7075-TiB₂ 复合材料的制备和性能[J]. 材料研究学报, 2025, 39(9): 683-693.
Fangxia XIE, Guangqing WU, Shiwen ZHANG, Zeyi LU, Yanming MU, Xueming HE. Preparation and Performance of a Novel Al-alloy Based Composite 7075-TiB₂[J]. Chinese Journal of Materials Research, 2025, 39(9): 683-693.

全文: PDF(18471 KB) HTML

摘要:

用热压烧结制备7075-xTiB₂ (x = 0%, 3%, 6%, 9%, 12%, 15%，质量分数)复合材料，研究了TiB₂颗粒含量和固溶温度对其微观组织和力学性能的影响。结果表明：在600 ℃热压烧结的7075-6%TiB₂复合材料其致密度可达98.17%。TiB₂颗粒阻碍了α-Al的生长，热压态7075-6%TiB₂复合材料的晶粒显著细化，平均晶粒尺寸由57.53 μm减小到38.12 μm。7075-6%TiB₂复合材料中主要分布在晶界的TiB₂颗粒，阻碍溶质扩散和降低扩散速度抑制了晶界处η(MgZn₂)相、S(Al₂CuMg)相的生长。细晶强化和弥散强化的共同作用使热压态7075-6%TiB₂复合材料的屈服强度和抗拉强度分别达到(205 ± 5) MPa和(338 ± 6) MPa；随着固溶温度(460~520 ℃)的提高，热压态7075-6%TiB₂复合材料的屈服强度和抗拉强度先提高后降低。在500 ℃固溶的复合材料内析出较多细小的强化相(η、S)，显著的弥散强化使屈服强度、抗拉强度分别比固溶处理前提高了39.5%和25.4%。在500 ℃固溶的7075-6%TiB₂复合材料，其力学性能比铝合金更好。

关键词 ：复合材料, 7075-6%TiB₂, 热压烧结, 力学性能, 固溶温度

Abstract：

Al-alloy 7075 based composites 7075-xTiB₂ (x = 0%, 3%, 6%, 9%, 12%, 15%, mass fraction) were prepared by hot pressing sintering. The effect of TiB₂ particle content and the post solution treatment temperatures on the microstructure and mechanical properties of the composites were studied. The results show that by hot press sintering at 600 ^oC, the density of 7075-6%TiB₂ composites can reach 98.17%; TiB₂ particles could effectively inhibit the growth of α-Al, and the average grain size of 7075-6%TiB₂ composite was significantly refined, decreasing from 57.53 μm to 38.12 μm; TiB₂ particles are mainly located at the grain boundaries, which hinder the diffusion of solute atoms, slow down their diffusion rate, and inhibit the growth of η(MgZn₂) and S(Al₂CuMg) phases at the grain boundaries; Correspondingly, the mechanical properties of the hot-press sintered 7075-6%TiB₂ composite reached the peak, and the yield strength and tensile strength were (205 ± 5) MPa and (338 ± 6) MPa, respectively, due to the joint action of fine crystal strengthening and dispersion strengthening. With the increase of solution temperature within the range 460-520 ^oC, the yield strength and tensile strength of hot-pressed 7075-6%TiB₂ composites first increase and then decrease. When the solution temperature is 500 ^oC, more small strengthening phases (η, S) are precipitated inside the composite matrix, and the dispersion strengthening effect is significant. Compared with the as hot-pressed 7075-6%TiB₂ composite, the yield strength and tensile strength are increased by 39.5% and 25.4%. It should be also mentioned that the composite 7075-6%TiB₂ being subjected to solution treated at 500 ^oC showed better mechanical properties than those of 7075 Al-alloy.

Key words： composite 7075-6%TiB₂ hot pressing sintering mechanical properties solution temperature

收稿日期: 2024-11-01

ZTFLH:

TB333

基金资助:国家自然科学基金(51501073);国家自然科学基金(51975251);国家自然科学基金(52205056);中国博士后科学基金(2023M731424)

通讯作者: 颉芳霞，副教授，xiefangxia@jiangnan.edu.cn，研究方向为高性能轻金属材料近净成形

Corresponding author: XIE Fangxia, Tel: (0510)85910562, E-mail: xiefangxia@jiangnan.edu.cn

作者简介: 颉芳霞，女，1985年生，博士

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https://www.cjmr.org/CN/10.11901/1005.3093.2024.444 或 https://www.cjmr.org/CN/Y2025/V39/I9/683

图1 7075-xTiB2 (x = 0%, 3%, 6%, 9%, 12%, 15%)复合材料的致密度与热压烧结温度的关系

图2 热压态7075-xTiB2 (x = 0%, 3%, 6%, 9%, 12%, 15%)复合材料的XRD谱和框选区1、2的局部放大

图3 热压态7075-xTiB2复合材料的SEM照片

图4 热压态7075-xTiB2复合材料的晶粒尺寸分布直方图

图5 热压态7075-6%TiB2复合材料的SEM照片、元素分布以及A点的EDS分析

图6 热压态7075-xTiB2 (x = 0%, 3%, 6%, 9%, 12%, 15%)复合材料的拉伸应力-应变曲线和力学性能

图7 热压态7075-xTiB2复合材料的断口形貌

图8 在不同温度固溶的7075-6%TiB2复合材料的XRD谱和框选区1、2的局部放大

图9 在不同温度固溶的7075-6%TiB2复合材料的SEM照片和B, C, D, E点的EDS分析

图10 在不同温度固溶的7075-6%TiB2复合材料的拉伸应力-应变曲线和力学性能

图11 在不同温度固溶的7075-6%TiB2复合材料的断口形貌

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