2Ni相；當(dāng)V 含量大于0.5at%時，NiTiV形狀記憶合金形成B19'相、Ti2Ni相和V的富集相，并且隨著V含量增加，V的富集相越來越多聚集于晶界。進(jìn)一步分析表明，Ni49.75Ti49.75V0.5和Ni49.25Ti49.25V1.5 形狀記憶合金發(fā)生了B2?B19'的一級相變，而Ni48.75Ti48.75V2.5和Ni48.25Ti48.25V3.5形狀記憶合金發(fā)生了B2?R?B19'的二級相變，盡管降溫過程中同時發(fā)生了部分的R相變與B19'馬氏體相變。隨著V含量增加，相變溫度隨著V含量增加逐漸降低，其主要原因是Ni/Ti比例的增加。此外，隨著V含量增加，合金的顯微硬度值呈現(xiàn)先降低然后幾乎保持不變的變化規(guī)律。"/>

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V含量對等原子比NiTi形狀記憶合金微觀組織、相變行為和顯微硬度的影響
作者:
作者單位:

1.廣東省科學(xué)院新材料研究所，廣東 廣州 510650;2.安徽工業(yè)大學(xué) 冶金工程學(xué)院，安徽 馬鞍山 243002;3.廣東省金屬強(qiáng)韌化技術(shù)與應(yīng)用重點實驗室，廣東 廣州 510650

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基金項目:

Guangdong province science and technology plan project (Grant No. 2019B090905009); Guangzhou science and technology plan project (Grant No. 201704030067)


Effect of V Content on Microstructure, Phase Transforma-tion Behavior and Microhardness of Equiatomic NiTi Shape Memory Alloy
Author:
Affiliation:

1.Institute of New Materials, Guangdong Academy of Sciences, Guangzhou 510650, China;2.College of Metallurgical Engineering, Anhui University of Technology, Maanshan 243002, China;3.Guangdong Provincial Key Laboratory of Metal Toughening Technology and Application, Guangzhou 510650, China

Fund Project:

Guangdong Province Science and Technology Plan Project (2019B090905009); Guangzhou Science and Technology Plan Project (201704030067)

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    摘要:

    采用光學(xué)顯微鏡、掃描電子顯微鏡、X射線衍射儀、差示掃描量熱儀和顯微硬度計等測試手段，研究了V含量對等原子比NiTi形狀記憶合金微觀組織、相變行為和顯微硬度的影響規(guī)律。結(jié)果表明：當(dāng)V含量為0.5at%時，具有等軸晶組織的NiTiV形狀記憶合金包含B19' 和 Ti2Ni相；當(dāng)V 含量大于0.5at%時，NiTiV形狀記憶合金形成B19'相、Ti2Ni相和V的富集相，并且隨著V含量增加，V的富集相越來越多聚集于晶界。進(jìn)一步分析表明，Ni49.75Ti49.75V0.5和Ni49.25Ti49.25V1.5 形狀記憶合金發(fā)生了B2?B19'的一級相變，而Ni48.75Ti48.75V2.5和Ni48.25Ti48.25V3.5形狀記憶合金發(fā)生了B2?R?B19'的二級相變，盡管降溫過程中同時發(fā)生了部分的R相變與B19'馬氏體相變。隨著V含量增加，相變溫度隨著V含量增加逐漸降低，其主要原因是Ni/Ti比例的增加。此外，隨著V含量增加，合金的顯微硬度值呈現(xiàn)先降低然后幾乎保持不變的變化規(guī)律。

    Abstract:

    The effect of vanadium (V) content on the microstructure, phase transformation behavior, and microhardness of the as-cast equiatomic NiTi shape memory alloy was investigated by optical microscope (OM), scanning electron microscope (SEM) equipped with an energy dispersive spectrometer (EDS), X-ray diffraction (XRD), differential scanning calorimetry (DSC) and Vickers microhardness tester. Results indicate that the as-cast Ni50-x/2Ti50-x/2Vx alloys with equiaxed grains consist mainly of B19' and Ti2Ni phases when V content is 0.5at%, above which Ni50-x/2Ti50-x/2Vx (x=1.5~3.5, at%) alloys exhibit a three-phase structure consisting of B19', Ti2Ni and V-rich phases, and the V-rich phases are more segregated at grain boundaries with the increase of V content. Further analysis reveals that both Ni49.75Ti49.75V0.5 and Ni49.25Ti49.25V1.5 alloys show a one-stage B2?B19' transformation. However, a two-stage B2?R?B19' transformation occurs in Ni48.75Ti48.75V2.5 and Ni48.25Ti48.25V3.5 alloys although R-phase transformation partially overlaps B19' martensitic transformation upon cooling. The transformation temperatures drop down with increasing the V content, which is attributed to the increase of Ni/Ti ratio in the matrix. In addition, as V element increases from 0.5at% to 3.5at%, the microhardness of the alloys first decreases and then remains almost unchanged.

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甘春雷,陳志偉,黎小輝,周楠,錢健清,鄭開宏,李繼林.V含量對等原子比NiTi形狀記憶合金微觀組織、相變行為和顯微硬度的影響[J].稀有金屬材料與工程,2021,50(12):4245~4250.[Gan Chunlei, Chen Zhiwei, Li Xiaohui, Zhou Nan, Qian Jianqing, Zheng Kaihong, Li Jilin. Effect of V Content on Microstructure, Phase Transforma-tion Behavior and Microhardness of Equiatomic NiTi Shape Memory Alloy[J]. Rare Metal Materials and Engineering,2021,50(12):4245~4250.]
DOI：10.12442/j. issn.1002-185X. E20210015

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  • 收稿日期:2021-05-19
  • 最后修改日期:2021-06-22
  • 錄用日期:2021-07-09
  • 在線發(fā)布日期: 2021-12-30
  • 出版日期: 2021-12-24