激光多次熔凝Zr55Cu30Al10Ni5非晶合金的晶化形态与演化机理
收稿日期: 2019-05-05
修回日期: 2019-06-06
网络出版日期: 2019-09-11
基金资助
凝固技术国家重点实验室开放课题项目(No.SKLSP201745);浙江省自然科学基金项目(No.LY16E050014)
Crystallization Morphology and Evolution Mechanism of Laser Multiple Remelting of Zr55Cu30Al10Ni5 Metallic Glass
Received date: 2019-05-05
Revised date: 2019-06-06
Online published: 2019-09-11
Supported by
Supported by the Fund of the State Key Laboratory of Solidification Processing in NWPU(No.SKLSP201745);Zhejiang Provincial Natural Science Foundation of China(No.LY16E050014)
采用脉冲激光对Zr55Cu30Al10Ni5非晶合金板进行激光多次熔凝，研究了激光多次熔凝时热影响区的晶化相形态随着熔凝次数增加时的演化规律。结果表明，随着熔凝次数的增加，晶粒数量逐渐增加，晶粒尺寸逐渐变大。随着晶粒的长大，卷入熔池内的晶粒造成的晶化也越来越显著。激光多次熔凝非晶合金时，热影响区内的晶粒尺寸和数量都随熔凝次数的增加而线性增加，不同非晶合金板的形核率和生长速率基本接近，但初始晶粒数量和初始晶粒尺寸不同，这和铜模铸造制备非晶合金板时的具体冷却过程差异有关。
关键词： Zr55Cu30Al10Ni5非晶合金; 激光多次熔凝; 晶化形态; 演化
杨高林 , 林鑫 , 卢献钢 . 激光多次熔凝Zr55Cu30Al10Ni5非晶合金的晶化形态与演化机理[J]. 金属学报, 2019 , 55(12) : 1544 -1550 . DOI: 10.11900/0412.1961.2019.00140
Laser additive manufacturing technology is a feasible technology for the fabrication of bulk metallic glass with complex geometry. It has the characteristics of small molten pool and high cooling rate. However, crystallization often occurs in heat affected zone (HAZ). In this work, laser multiple remelting of Zr55Cu30Al10Ni5 metallic glass by pulsed laser was carried out and the morphological evolution of the HAZ crystalline phase in the multiple remelting process was studied. The results show that with the increase of the remelting times, the crystalline grains number and size are both improved. With the growth of the grains, the crystallization caused by the growth of the crystalline grains in the molten pool also becomes more and more remarkable. Both the size and number of the grains in the HAZ increase linearly with the increase of the remelting times. The nucleation rate and growth rate of different metallic glass plates are close, whereas the initial crystalline grains number and size are different, which are attributed to the different cooling process in the copper casting of the metallic glass plates.
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