最近，课题组题为“过冷共晶合金凝固过程中重熔导致的反常共晶形成”的论文（作者：韦修勋，林鑫，徐万强，黄起森，Michael Ferry，李金富，周尧和）被国际著名学术期刊Acta Materialia接受并发表（2015年，95卷，44-56页），工作得到了审稿人和编辑的高度赞扬和肯定。
共晶合金在其平衡熔点温度以下凝固时，随着过冷度的增大，常发生层片（棒状）共晶向反常共晶的转变。关于其机制，在经过数十年的研究后仍然存在许多争议。本论文基于最新的共晶生长理论模型，紧紧抓住初生共晶相为过饱和固溶体以及快速凝固过程伴随有显著的温度再辉这一主线，给出了初生共晶相在温度再辉过程中重熔分数的定量表征方法，阐明了平衡溶质分配系数、液相线斜率和共晶点成分等参数对重熔分数的影响规律，结合典型共晶合金中反常共晶组织的分析结果，全面阐述了反常共晶的形成机制。
非平衡凝固理论是课题组的主要研究方向之一，在过去的十余年间，课题组围绕共晶生长理论模型、凝固组织演化、凝固界面形态以及亚稳相形成等问题，进行了大量研究，成果陆续发表于Acta Materialia、Metallurgical and MaterialsTransaction A等刊物，产生了较大的影响。
附：论文摘要
Anomalous eutectics are argued to form due tothe remelting of the primary solid during solidification of deeply undercooledeutectic alloy melts. As an indicator of the tendency for anomalous eutecticformation, the remelted fraction of the primary eutectic was analyzedsystematically based on the eutectic dendrite growth theory. For eutecticalloys with either larger equilibrium solute distribution coefficients orgentle liquidus slopes, the primary eutectic is highly supersaturated withsolute and more prone to remelting. When the eutectic composition is set todifferent values, (e.g. the eutectic point is closer to one phase of theeutectic), the two eutectic phases under rapid growth change their compositionssimultaneously, but their remelted fractions during temperature recalescence donot vary significantly. Three representative binary eutectic alloys Ag-39.9at.%Cu, Ni-19.6at.%P and Pd-16.0at.%P - their eutecticproducts are solid solution-solidsolution, solid solution-stoichiometricintermetallic compoundand stoichiometricintermetallic compound-stoichiometric intermetallic compound, respectively,were solidified at large undercooling. Anomalous eutectics were observed in thefirst two eutectic alloys whose eutectic structure consists of at least onesolid solution phase, whereby the stoichiometric intermetallic compound phase remainedhighly oriented whereas the solid solution phase had a near random distributionof orientations. For the Pd-16.0at.%P alloy, however, the primary eutecticretained its original morphology as the final solidification structureregardless of the degree of undercooling. All these experimental results validatethe argument that anomalous eutectics result from the remelting of the primarysolid.
