Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第15卷    第3期    总第72期    2005年3月

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文章编号: 1004-0609(2005)03-0404-06
铸态Ti-Sc二元合金的组织特征、相结构和显微硬度
刘会群1, 易丹青1, 肖来荣1, 王 斌1
卢 斌1, 黄道远1, 杨 胜1, 魏鎏英2

( 1. 中南大学 材料科学与工程学院,长沙 410083;
2. School of Technology and Society, Malmö University,
 Malmö 20506, Sweden
)

摘 要: 采用真空电弧熔炼技术制备了4种成分的Ti-Sc二元合金, 并借助金相显微镜(OM)、 扫描电子显微镜(SEM)、 能谱分析(EDS)、 X射线衍射(XRD)技术及显微硬度测试, 对合金的组织形貌、 相成分以及不同形貌相的显微硬度进行了分析。 结果表明: 合金铸态组织形貌为螺旋状、 团簇状片层、 双相组织; 金属Sc对合金的组织有着明显的细化作用, 在合金中Sc与Ti形成了固溶体, 不同形貌的相, 其显微硬度差别较大; 当Sc含量为2%~3%时, Ti-Sc二元合金的显微硬度达到最高值, Sc含量高于2%~3%时, 合金基体硬度高于片层组织硬度, Sc含量低于2%~3%时, 合金基体硬度低于片层组织硬度, 少量Sc对合金性能有所提高, 对α相片层组织有强化作用。

 

关键字:  Ti-Sc二元合金; 显微组织; 相结构; 显微硬度

Microstructure, phase structure and microhardness of as-cast Ti-Sc binary alloys
LIU Hui-qun1, YI Dan-qing1, XIAO Lai-rong1, WANG Bin1,
LU Bin1, HUANG Dao-yuan1, YANG Sheng1, WEI Liu-ying2

1. School of Materials and Science Engineering,
Central South Universtity, Changsha 410083, China;
2. School of Technology and Society, Malmö University,
Malmö 20506, Sweden

Abstract: Four kinds of Ti-Sc binary alloys were prepared by vaccum arc melting technique. Microstructure, phase components and microhardness of different phases were analyzed by optical microscopy(OM), scanning electron microscope(SEM), X-ray diffraction(XRD) and microhardness tester. The results show that scandium plays a significant role on refinement of the microstructure. Solid solution forms in Ti-Sc binary alloys. The measured microhardness of different phases are in significant discrepancy. Microhardness of Ti-Sc binary alloys reaches the maximum value with 2%-3% Sc. When Sc content is higher than 2%-3%, microhardness of matrix is higher than that of plate-like phases, contrary tendency can be seen when Sc content is lower than 2%-3%. Small content of scandium can improve the properties of alloys and strengthen the α plate-like phases.

 

Key words: Ti-Sc binary alloy; microstructure; phase structure; microhardness

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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