【摘要】 加入６ｍｇ·ｇ（－１）Ｎｄ的非晶Ｔｉ＿（８０）Ｓｉ＿（２０）合金，在５５０—７００退火１ｈ后，可形成Ｔｉ＿３Ｓｉ基体相与弥散分布的α—Ｔｉ颗粒组成的纳米复合材料．Ｘ射线及电子衍射分析表明：在晶化过程中，初始析出相为小颗粒的α－Ｔｉ，随后析出主相Ｔｉ＿３Ｓｉ和少量Ｔｉ＿５Ｓｉ＿３，但未见稀土相形成．用高分辨电镜研究了Ｔｉ＿３Ｓｉ的亚晶结构．更多还原

【Abstract】 nano-composite containing a-Ti and Ti3Si phases has been produced by annealing the as-quenched amorphous Ti80Si20 alloy containing 6mg g(-1) Nd.The detailed crystallization behaviour of the amorphous alloy,which produced by using an arc-melting piston and anvil apparatus,has been studied.After the amorphous alloy was annealed at 550t for 1h,fine particles with an average grain size of 20nm,which were identified to be β-Ti,precipitated in the amorphous matrix. However,the eutectic precipitation of Ti5Si3 and β-Ti was also observed in the thicker samples.The orientation relationship between β-Ti and Ti5Si3 can be written as:[111]β-Ti [001]Ti5si3 and(110)Ti5Si3 The alloy has completely crystallized after annealing at 600℃ for 1h,the eutectic microstructure was not detected. HREM observations revealed that high density of a-Ti fine particles exist inside the predominant Ti3Si phase.The Ti3Si grains have an average size of about 0.5-2μm.However,each Ti3Si grain was consisted of many nanoscale subgrains with an average size of about 40nm,and a significant strain existed in the subgrain boundary regions.The formation mechanism of the Ti3Si subgrains has been discussed.更多还原