盧 斌1， 黃道遠(yuǎn)1， 楊 勝1， 魏鎏英2
( 1. 中南大學(xué) 材料科學(xué)與工程學(xué)院，長沙 410083；
2. School of Technology and Society, Malmö University,
Malmö 20506, Sweden)
摘 要: 采用真空電弧熔煉技術(shù)制備了4種成分的Ti-Sc二元合金， 并借助金相顯微鏡(OM)、 掃描電子顯微鏡(SEM)、 能譜分析(EDS)、 X射線衍射(XRD)技術(shù)及顯微硬度測試， 對合金的組織形貌、 相成分以及不同形貌相的顯微硬度進(jìn)行了分析。 結(jié)果表明： 合金鑄態(tài)組織形貌為螺旋狀、 團(tuán)簇狀片層、 雙相組織； 金屬Sc對合金的組織有著明顯的細(xì)化作用， 在合金中Sc與Ti形成了固溶體， 不同形貌的相， 其顯微硬度差別較大； 當(dāng)Sc含量為2%～3%時(shí)， Ti-Sc二元合金的顯微硬度達(dá)到最高值， Sc含量高于2%～3%時(shí)， 合金基體硬度高于片層組織硬度， Sc含量低于2%～3%時(shí)， 合金基體硬度低于片層組織硬度， 少量Sc對合金性能有所提高， 對α相片層組織有強(qiáng)化作用。
關(guān)鍵字: Ti-Sc二元合金； 顯微組織； 相結(jié)構(gòu)； 顯微硬度
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
