粉末冶金<strong>TiVNbTa</strong>难熔高熵合金的组织和力学性能

doi:10.11901/1005.3093.2018.742

材料研究学报

2019, Vol. 33

Issue (8): 572-578 DOI: 10.11901/1005.3093.2018.742

研究论文

本期目录 | 过刊浏览

粉末冶金TiVNbTa难熔高熵合金的组织和力学性能

高楠^1,²,龙雁¹(

),彭海燕^1,³,张伟华¹,彭亮¹

1. 华南理工大学广东省金属新材料制备与成形重点实验室广州 510640
2. 中国(武汉)知识产权保护中心武汉 430023
3. 广东技术师范大学机电学院广州 510635

Microstructure and Mechanical Properties of TiVNbTa Refractory High-Entropy Alloy Prepared by Powder Metallurgy

Nan GAO^1,²,Yan LONG¹(

),Haiyan PENG^1,³,Weihua ZHANG¹,Liang PENG¹

1. Guangdong Provincial Key Laboratory for Processing and Forming of Advanced Metallic Materials, Sourth China University of Technology, Guangzhou 510640，China
2. China (Wuhan) Intellectual Property Protection Center, Wuhan 430023，China
3. Guangdong Polytechnic Normal University，Guangzhou 510635，China

引用本文:

高楠, 龙雁, 彭海燕, 张伟华, 彭亮. 粉末冶金TiVNbTa难熔高熵合金的组织和力学性能[J]. 材料研究学报, 2019, 33(8): 572-578.
Nan GAO, Yan LONG, Haiyan PENG, Weihua ZHANG, Liang PENG. Microstructure and Mechanical Properties of TiVNbTa Refractory High-Entropy Alloy Prepared by Powder Metallurgy[J]. Chinese Journal of Materials Research, 2019, 33(8): 572-578.

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摘要:

将机械合金化(MA)与放电等离子烧结(SPS)相结合制备了难熔TiVNbTa高熵合金，研究了这种合金的机械合金化过程、相组成和显微组织，以及烧结温度和O、N含量对其力学性能的影响。结果表明：机械合金化后高熵合金粉末为BCC结构，放电等离子烧结成的块体高熵合金由BCC基体和FCC析出相组成，其析出相为TiN+TiC+TiO的复合物。烧结温度为1100℃的高熵合金具有良好的综合力学性能，压缩屈服强度达到1506.3 MPa，塑性应变为33.2%。随着烧结温度的提高，合金发生了从准脆性到塑性再到脆性断裂的转变。O和N含量的提高对高熵合金强度的影响较小，但是使其塑性显著降低。

关键词 ：金属材料, 难熔高熵合金, 机械合金化, 放电等离子烧结, 组织结构, 力学性能

Abstract：

The TiVNbTa refractory high-entropy alloy (HEA) was fabricated by mechanical alloying (MA) and spark plasma sintering (SPS). The mechanically alloying process, phase composition and microstructure as well as the effect of sintering temperature, O- and N-content on the mechanical properties of the alloy were studied. The mechanically alloyed powders present a single BCC crystal structure, while the spark plasma sintered alloy composed of a FCC matrix with precipitated phases of TiN, TiC and TiO. The alloy sintered at 1100°C performed outstanding mechanical properties with compressive yield strength of 1506 MPa and plastic strain of 33.2%, respectively. As sintering temperature increased, the alloy fracture mechanism basically transformed from quasi-brittle fracture to ductile fracture, and finally to brittle fracture. The increase of O- and N-content had little effect on the strength of the alloy, but negative effect obviously on its plasticity.

Key words： metallic materials refractory high-entropy alloys mechanically alloying spark plasma sintering microstructure mechanical properties

收稿日期: 2019-01-04

ZTFLH:

TG146

基金资助:广东省科技计划(No. 2015A010105011)

作者简介: 高楠，男，1991年生，硕士生

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图1 球磨不同时间的TiVNbTa合金粉末的XRD图谱

图2 烧结温度不同的TiVNbTa合金的XRD图谱

图3 在1100℃烧结的TiVNbTa合金的SEM背散射形貌

图4 在1100℃烧结的TiVNbTa合金的TEM明场像，附图为BCC相沿[001]轴的选区衍射斑点和FCC相沿[011]轴的选区衍射斑点

表1 块体TiVNbTa合金的EDS/TEM成分分析

图5 在不同温度烧结的块体TiVNbTa高熵合金的压缩工程应力-应变曲线

图6 不同烧结温度下TiVNbTa合金的断口形貌

表2 TiVNbTa合金的O、N含量

图7 烧结温度为1100、1200、1300℃的HEA1和HEA2合金的金相组织形貌

图8 HEA1与HEA2的屈服强度和塑性应变比较

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