%0 Journal Article
%T STUDIES ON PRIMARY CRYSTALLIZATION OF RAPIDLY QUENCHED Al-Ni-Cu-Nd METALLIC GLASS BY USING HIGH RESOLUTION TRASMISSION ELECTRON MICROSCOPY
%A YDXiao
%A WXLi
%A DJacovkis
%A NClavaguera
%A MTClavaguera-Mora
%A JRodriguez-Viejo
%A <br>D. Jacovkis
%A N. Clavaguera
%A M.T. Clavaguera-Mora
%A J. Rodriguez-Viejo
%J 金属学报(英文版)
%D 2003
%I 
%X Rapidly solidified Al87Ni7Cu3Nd3 metallic glasses, prepared by using melt spinning,were treated under both isothermal and non-isothermal regime. The amorphous ribbon and the annealed samples were closely examined by means of differential scanning calorimetric, conventional X-ray diffraction and high resolution transmission electron microscopy with selected-area electron diffraction, with special interest in primary crystallization into α-Al nanocrystalline particles, in order to understand structural characteristics of Al-based amorphous/nanocrystalline alloys, and nucleation and grain growth mechanism on the nanometer scale during primary crystallization.The results show that, the as-prepared ribbons are fully amorphous and homogeneous in the micron scale, but contain high density of quenched-in clusters or crystallite embryos. Primary crystallization mainly leads to formation of two-phase mixture of α-Al crystal and residual amorphous phase. The annealed ribbons exposed isothermally at 110℃f or 5, 130 minutes and heated continuously up to less than 310℃ at 40℃/min consist of large amount of α-Al fcc crystal nanoparticles dispersed uniformly in an amorphous matrix. However, a very little amount of finer orthorhombie Al3Ni intermetalics particles exist in the annealed ribbons heated up to 310℃. During primary crystallization, the leading kinetic mechanics to impede growth of the α-Al crystal is soft impingement, instead of geometrie impingement.
%K rapid solidification
%K Al-rich amorphous alloy
%K crystallization
%K nu- cleation and growth mechanism<br>
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=AB188D3B70B071C57EB64E395D864ECE&jid=C19B08D052F5FD8445F4BB80A1A5D7BF&aid=0A6C4B6A7F65E224F38003B4A55D3C8B&yid=D43C4A19B2EE3C0A&vid=7801E6FC5AE9020C&iid=94C357A881DFC066&sid=8CCD0401CC9AE432&eid=BFB86B6ED3A99B9D&journal_id=1006-7191&journal_name=金属学报(英文版)&referenced_num=1&reference_num=18