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利用5 kW连续波CO2激光器对Zn-2%Cu包晶合金进行了表面快速熔凝实验研究,扫描速率从6 mm/s至1207mm/s.随着凝固速率的提高,该合金微观组织形态由低速平界面向层片状组织、浅胞晶直至高速绝对稳定平界面转变.实验结果表明,该合金微观组织演化规律与利用林鑫等的数值模型和Jackson-Hunt的共晶模型相结合所得到的界面响应函数作出的预测结果吻合较好.

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