激光多次熔凝Zr55Cu30Al10Ni5非晶合金的晶化形态与演化机理

doi:10.11900/0412.1961.2019.00140

金属学报

2019, Vol. 55

Issue (12): 1544-1550 DOI: 10.11900/0412.1961.2019.00140

研究论文

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激光多次熔凝Zr₅₅Cu₃₀Al₁₀Ni₅非晶合金的晶化形态与演化机理

杨高林¹,林鑫²(

),卢献钢¹

1. 浙江工业大学激光先进制造研究院杭州 310014
2. 西北工业大学凝固技术国家重点实验室西安 710072

Crystallization Morphology and Evolution Mechanism of Laser Multiple Remelting of Zr₅₅Cu₃₀Al₁₀Ni₅ Metallic Glass

YANG Gaolin¹,LIN Xin²(

),LU Xiangang¹

1. Institute of Laser Advanced Manufacturing, Zhejiang University of Technology, Hangzhou 310014, China
2. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China

引用本文:

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.
YANG Gaolin, LIN Xin, LU Xiangang. Crystallization Morphology and Evolution Mechanism of Laser Multiple Remelting of Zr₅₅Cu₃₀Al₁₀Ni₅ Metallic Glass[J]. Acta Metall Sin, 2019, 55(12): 1544-1550.

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摘要:

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

Abstract：

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.

Key words： Zr₅₅Cu₃₀Al₁₀Ni₅metallic glass laser multiple remelting crystallization morphology evolution

收稿日期: 2019-05-05

ZTFLH:

TG24

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)

作者简介: 杨高林，男，1980年生，博士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2019.00140 或 https://www.ams.org.cn/CN/Y2019/V55/I12/1544

表1 不同非晶合金板的电子探针成分测量结果 (atomic fraction / %)

图1 激光熔凝1~16次No.B Zr55非晶合金板的熔池形貌OM像

图2 激光熔凝1、3、7和13次No.C非晶合金板后的熔池形貌OM像

图3 No.B Zr55非晶合金板在多次熔凝过程中的热影响区典型晶化相形貌演化过程

图4 No.C非晶合金板在多次熔凝过程中的晶粒微观组织演化过程

图5 No.C非晶合金板激光熔凝后的TEM明场像和选区电子衍射(SAED)花样

图6 No.A非晶合金板热影响区晶化区域的SEM像及相应的EPMA面扫描结果

图7 激光多次熔凝No.B和No.C非晶合金板过程中的晶粒数量随熔凝次数的变化统计

图8 激光多次熔凝No.B和No.C非晶合金板过程中的晶粒直径演化

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