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利用对掺法制备Al-Ce中间合金,并对工业纯铝进行细化研究。利用X射线衍射(XRD)、能谱仪(EDS)、光学显微镜(OM)等检测手段对Al-Ce中间合金细化剂的微观组织和对工业纯铝细化机制进行研究。结果表明:通过XRD和EDS分析,Al-Ce中间合金的相主要包括α-Al、Al11Ce3相和Ce相。铝液中加入Al-Ce中间合金,可以细化工业纯铝晶粒。当中间合金添加量低于0.1%时,随着Al-Ce中间合金添加量的增加,对工业纯铝的细化效果越来越好。当加入0.1%Al-Ce中间合金时细化效果最好,晶粒尺寸细化到170.55μm,形状因子为0.68,同时力学性能也最好,抗拉强度和延伸率分别为74.5MPa、47.64%。。添加量超过0.1%时,随着添加量的增多,细化效果会减弱。制备Al-Ce中间合金时共晶反应生成的Al11Ce3和α-Al具有相似的晶体结构,而且晶格常数也能相对应,所以Al11Ce3可以作为α-Al凝固时的异质形核点,从而促进细化。
The Al-Ce master alloy was prepared by blending method and the pure aluminum was refined. The microstructure of Al-Ce master alloy refining agent and its mechanism of refinement of industrial pure aluminum were studied by X-ray diffraction (XRD), energy dispersive spectrometer (EDS) and optical microscope (OM) The results show that the phases of Al-Ce master alloy mainly include α-Al, Al11Ce3 and Ce phases by XRD and EDS analysis. Adding Al-Ce master alloy aluminum alloy, can refine the industrial pure aluminum grains. When the amount of intermediate alloy is less than 0.1%, with the increase of Al-Ce master alloy, the refining effect of industrial pure aluminum is getting better and better. When 0.1% Al-Ce master alloy was added, the refining effect was the best. The grain size was refined to 170.55μm, the shape factor was 0.68, and the mechanical properties were the best. The tensile strength and elongation were 74.5MPa and 47.64% . . When the amount is over 0.1%, the refinement effect will be weakened as the amount of addition increases. Al11Ce3 and α-Al formed by eutectic reaction during the preparation of Al-Ce master alloy have similar crystal structure, and the lattice constants can also be corresponding, so Al11Ce3 can be used as heterogeneous nucleation sites during the α-Al solidification and thus promote Refine.