机械合金化和放电等离子烧结制备NbMoCrTiAl高熵合金

doi:10.11896/cldb.18020113

材料导报

2019, Vol. 33

Issue (10): 1671-1675 https://doi.org/10.11896/cldb.18020113

金属与金属基复合材料

机械合金化和放电等离子烧结制备NbMoCrTiAl高熵合金

颜建辉^1,2,3, 李凯玲¹, 汪异^1,2,3, 邱敬文^1,2,3

1 湖南科技大学材料科学与工程学院,湘潭 411201
2 湖南科技大学高温耐磨材料及制备技术湖南省国防科技重点实验室, 湘潭 411201
3 湖南科技大学新能源储存与转换新进材料湖南省重点实验室,湘潭 411201

NbMoCrTiAl High-entropy Alloy Prepared by Mechanical Alloying and Spark Plasma Sintering

YAN Jianhui^1,2,3, LI Kailing¹, WANG Yi^1,2,3, QIU Jingwen^1,2,3

1 College of Materials Science and Technology, Hunan University of Science and Technology, Xiangtan 411201
2 Hunan Provincial Key Defense Laboratory of High Temperature Wear resisting Materials and Preparation Technology, Hunan University of Science and Technology, Xiangtan 411201
3 Hunan Provincial Key Lab of Advanced Materials for New Energy Storage and Conversion, Hunan University of Science and Technology, Xiangtan 411201

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摘要研究了球磨转速、球料比和球磨时间对NbMoCrTiAl高熵合金粉末的物相、微观形貌及粒度的影响,探讨了不同温度下放电等离子烧结制备NbMoCrTiAl高熵合金微观组织和硬度的变化规律。结果表明:在转速300 r/min和球料比10∶1条件下,球磨60 h粉末只达到部分合金化;在转速300 r/min和球磨50 h时,球料比要达到12∶1才能实现粉末完全合金化;在球料比10∶1和球磨50 h条件下,球磨转速要高于400 r/min才能获得单一BCC固溶体高熵合金。NbMoCrTiAl粉末在高能球磨中元素发生合金化的先后顺序为Al→Ti→Cr→Nb→Mo。NbMoCrTiAl高熵合金粉末在放电等离子烧结(SPS)时发生了第二相析出和溶解转变。随着烧结温度的升高(1 400~1 600 ℃),第二相的数量减少及其尺寸增大,导致了合金硬度的降低。

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关键词: 高熵合金 NbMoCrTiAl 机械合金化等离子烧结

Abstract: The effects of ball milling speed, ball-to-powder ratio and milling duration on the phase, morphology and particle size of NbMoCrTiAl high entropy alloy powders were investigated. The microstructure and hardness of NbMoCrTiAl high-entropy alloys prepared at different spark plasma sintering temperatures were investigated. The results indicated that incomplete alloying of powders occurred at the rotational speed of 300 r/min, ball-to-powder ratio of 10∶1 and milling duration of 60 h. Only the ball-to-powder ratio reached 12∶1 under the milling conditions of 300 r/min and 50 h can complete alloying of powders be achieved. Moreover, NbMoCrTiAl high entropy alloy with single BCC solid solution could be obtained on condition that the ball milling speed exceeded 400 r/min, with the ball-to-powder ratio of 10∶1 and milling duration of 50 h. The alloying sequence of elements in NbMoCrTiAl high entropy alloy was Al→Ti→Cr→Nb→Mo. The precipitation and dissolution change of the second phases occurred in NbMoCrTiAl high entropy alloy during the SPS process. With the rising sintering temperature(1 400—1 600 ℃), the second phases presented a decrease in number and an increase in size, which leaded to the gradual reduction of hardness.

Key words: entropy alloy NbMoCrTiAl mechanical alloying spark plasma sintering

发布日期: 2019-05-16

ZTFLH:

TG146.4

基金资助: 国家自然科学基金(51475161)

通讯作者: yanjianhui88@163.com

作者简介: 颜建辉,湖南科技大学教授,博士研究生导师。2009年6月年获中南大学粉末冶金国家重点实验博士学位。在国内外学术期刊上发表论文60余篇,申请国家发明专利6项,其中授权4项。主要研究方向包括:新型高温结构材料研发、材料抗高温氧化防护、材料表面减摩耐磨技术、材料强韧化等。主持包括国家自然科学基金面上项目、湖南省自然科学基金、湖南省科技计划项目等。

引用本文:

颜建辉, 李凯玲, 汪异, 邱敬文. 机械合金化和放电等离子烧结制备NbMoCrTiAl高熵合金[J]. 材料导报, 2019, 33(10): 1671-1675.
YAN Jianhui, LI Kailing, WANG Yi, QIU Jingwen. NbMoCrTiAl High-entropy Alloy Prepared by Mechanical Alloying and Spark Plasma Sintering. Materials Reports, 2019, 33(10): 1671-1675.

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http://www.mater-rep.com/CN/10.11896/cldb.18020113 或 http://www.mater-rep.com/CN/Y2019/V33/I10/1671

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