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Hf含量對NbMo0.5HfxTiZrCrAl難熔高熵合金組織及力學性能的影響
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作者單位:

西南交通大學 材料先進技術(shù)教育部重點實驗室

作者簡介:

通訊作者:

中圖分類號:

TG146.1

基金項目:

國家自然科學基金資助(項目號51701167)


Effect of Hf content on microstructure and mechanical properties of NbMo0.5HfxTiZrCrAl refractory high-entropy alloy
Author:
Affiliation:

1.Key Laboratory of Advanced Technologies of Materials,Ministry of Education,School of Materials Science and Engineering,Southwest Jiao tong University,Cheng’du 610031;2.P.R. China

Fund Project:

The national Natural Science Foundation of China

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    摘要:

    采用真空非自耗電弧熔煉的方法制備了5種名義成分為NbMo0.5HfxTiZrCrAl(x=0, 0.25, 0.5, 0.75, 1, at.%)的難熔高熵合金。研究了Hf對合金組織及力學性能的影響規(guī)律。結(jié)果表明：添加Hf和不添加Hf的合金的微觀組織均由兩種BCC相（即BCC1和BCC2）和Laves相構(gòu)成。在未添加Hf的合金中，BCC1相中主要富含Zr、Cr和Al元素，BCC2相中主要富含Nb、Ti和Mo元素。而在添加Hf的合金中，BCC1相中主要富含Hf、Zr、Cr、Mo和Al元素，BCC2相中主要富含Nb和Ti元素。隨著Hf含量的增加，BCC1相的含量逐漸增加，且BCC1和BCC2相的晶格常數(shù)均有所增大。此外，隨著Hf含量的增加，合金的硬度和脆性均逐漸增加，而合金在1200 ℃的抗壓強度逐漸降低。

    Abstract:

    Five refractory high-entropy alloys with nominal composition of NbMo0.5HfxTiZrCrAl (x=0, 0.25, 0.5, 0.75, 1, at.%) were prepared by vacuum non-consumable arc smelting. The effects of Hf addition on the microstructure and mechanical properties of the alloys were studied. The results show that the microstructures of the alloys with and without Hf are composed of two BCC phases (namely BCC1 and BCC2) and Laves phase. In the alloy without adding Hf, the BCC1 phase is mainly rich in Zr, Cr and Al elements, and the BCC2 phase is mainly rich in Nb, Ti and Mo elements. In the Hf-added alloys, the BCC1 phase is mainly rich in Hf, Zr, Cr, Mo and Al elements, and the BCC2 phase is mainly rich in Nb and Ti elements. With the increase of Hf content, the amount of BCC1 phase gradually increases, and the lattice constants of BCC1 and BCC2 phases both increase. In addition, with the increase of Hf content, the microhardness and brittleness of the alloy gradually increase, and the compressive strength of the alloy at 1200 ℃ gradually decreases.

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張松,曾琪皓,胥永剛,張入偉,郭宇,張卓琳. Hf含量對NbMo0.5HfxTiZrCrAl難熔高熵合金組織及力學性能的影響[J].稀有金屬材料與工程,2022,51(3):1024~1030.[Zhang Song, Zeng Qihao, Xu Yonggang, Zhang Ruwei, Guo Yu, Zhang Zhuolin. Effect of Hf content on microstructure and mechanical properties of NbMo0.5HfxTiZrCrAl refractory high-entropy alloy[J]. Rare Metal Materials and Engineering,2022,51(3):1024~1030.]
DOI：10.12442/j. issn.1002-185X.20210198

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  • 收稿日期:2021-03-10
  • 最后修改日期:2021-05-11
  • 錄用日期:2021-05-13
  • 在線發(fā)布日期: 2022-04-06
  • 出版日期: 2022-03-30