Micro and sub-micro morphology of Mg65Cu25Y10 bulk amorphous alloy containing primary crystalline phases

Acoustic-frequency induction melting together with rapid quenching was used to prepare Mg65Cu25Y10 bulk amorphous alloy containing primary crystalline phases. Transmission electron microscopy （TEM）, X-ray diffractometry （XRD）, environmental scanning electron microscopy （ESEM） and atomic force microscopy （AFM） were used to study the amorphization and morphology of the prepared alloy. Under micro condition, the sample alloy is composed of amorphous structure with cauliflorate shape, primary CuMg2 dendrite phase, mixed primary CuMg2 and Cu2Y crystalline phases, as well as Mg phase with small size. Further study under sub-micro condition shows that, the planar amorphous structure of cauliflorate shape is composed of the three-dimensional sub-micro morphology of ＂bulge-concavity＂ pattern, which extends into the space in terms of certain period. It is estimated that the major factors influencing the micro and sub-micro morphologies of amorphous alloy are its super-cooling liquid structure, rapid quenching transformation, as well as the melting conditions.     

冷气动力喷涂技术制备涂层的研究进展

冷气动力喷涂技术是在室温或有限加热的温度下利用高压气体产生高速气流喷涂金属、合金以及复合涂层的新兴表面工程技术.综述了国内外冷喷涂领域的研究现状,总结了冷喷涂技术制备纯金属涂层、合金涂层以及复合涂层的研究进展,尤其是制备纳米结构涂层的最新成果,主要包括纳米涂层的结构、性能、特点及应用.     

含晶化相Mg65Cu25Y10大块非晶的显微和亚显微形貌研究

利用音频感应加热结合快速冷却的方法制备含晶化相的Mg65Cu25Y10大块非晶合金.显微状态下,合金由"菜花状"的非晶态、初生CuMg2相、初生CuMg2与Cu2Y混合相以及Mg单相组成.亚显微状态下,"菜花状"的非晶态是由"凸起-凹陷式"的三维形貌在一定空间内延展而构成.讨论了影响非晶态显微和亚显微形貌的主要因素.