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金属学报  2022, Vol. 58 Issue (10): 1281-1291    DOI: 10.11900/0412.1961.2021.00075
  研究论文 本期目录 | 过刊浏览 |
形核剂的添加方式对选区激光熔化成形含锆Al-Cu-Mg合金显微组织与力学性能的影响
王凯冬, 刘允中(), 詹强坤, 黄斌
华南理工大学 国家金属材料近净成形工程技术研究中心 广州 510640
Effect of Adding Methods of Nucleating Agent on Microstructure and Mechanical Properties of Zr Modified Al-Cu-Mg Alloys Prepared by Selective Laser Melting
WANG Kaidong, LIU Yunzhong(), ZHAN Qiangkun, HUANG Bin
National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials, South China University of Technology, Guangzhou 510640, China
全文: PDF(5343 KB)   HTML
摘要: 

采用选区激光熔化技术制备了含锆Al-Cu-Mg合金,研究了不同方式添加Al3Zr形核剂对试样显微组织和力学性能的影响。结果表明,直接添加Al3Zr和原位生成Al3Zr均能抑制该合金试样的热裂纹,当激光能量密度为370 J/mm3时,试样的平均晶粒尺寸分别由15.69 μm细化至1.88和1.28 μm。原位生成Al3Zr提供的形核剂均为亚稳态Al3Zr立方相(L12-Al3Zr),形核能力高于直接添加Al3Zr获得的Al3Zr颗粒和L12-Al3Zr形核剂。原位生成Al3Zr的Al-Cu-Mg合金综合力学性能更为优异,T6热处理态试样抗拉强度达(485 ± 10) MPa,伸长率比直接添加Al3Zr的合金高出30%。原位生成Al3Zr几乎无需通过高的激光能量密度增强Marangoni对流来实现晶粒细化剂的分散,可使Al-Cu-Mg合金适用于较高速率成形。

关键词 选区激光熔化Al-Cu-Mg合金Al3Zr显微组织力学性能    
Abstract

Selective laser melting (SLM) technology is gaining increasing attention in the field of additive manufacturing. Al-Cu-Mg alloy parts manufactured using SLM technology exhibit significant advantages in lightweight design and the integrated formation of complex structural parts in the aerospace field. However, because of their wide freezing ranges, Al-Cu-Mg alloys have a high cracking tendency at a high cooling rate. SLM technology was used to prepare Zr-modified Al-Cu-Mg alloys in this study. Al3Zr particles were synthesized to directly add to Al-Cu-Mg alloy powders, and ZrH2 particles were chosen to form Al3Zr in-situ during SLM processes. The differences between the effects of adding Al3Zr particles directly and forming Al3Zr in-situ on the microstructures and the mechanical properties of SLMed Al-Cu-Mg alloys were analyzed. The results show that the common hot tearing in as-built Al-Cu-Mg alloys all disappear due to the addition of Al3Zr nucleating agent and the in-situ formed Al3Zr is more conducive to refining grains and improving the plasticity and the processing efficiency of SLMed Al-Cu-Mg alloys. When the laser energy density is 370 J/mm3, the grain size of the samples containing Al3Zr and in-situ formed Al3Zr particles are 1.88 and 1.28 μm, respectively. L12-Al3Zr and undissolved or unmelted Al3Zr particles are the nucleation particles generated by initial Al3Zr particles; whereas, they are all metastable Al3Zr (L12-Al3Zr) synthesized in-situ. L12-Al3Zr has a better nucleation ability than initial Al3Zr particles. The ultimate strength of the heat-treated samples with initial Al3Zr particles or in-situ formed Al3Zr can reach (493 ± 2) or (485 ± 10) MPa, respectively. The elongation of the samples with the in-situ formed Al3Zr is more than 30% higher than that of the samples containing Al3Zr particles. SLMed Al-Cu-Mg alloys with in-situ formed Al3Zr are more suitable for medium-high-speed processes because strong Marangoni flow aroused by high laser energy density is unnecessary for in-situ formed Al3Zr to realize the dispersion of the grain refiner.

Key wordsselective laser melting    Al-Cu-Mg alloy    Al3Zr    microstructure    mechanical property
收稿日期: 2021-02-09     
ZTFLH:  TG146.2  
基金资助:广东省重点领域研发计划项目(2019B090907001);广东省重大科技专项项目(2014B010129002)
通讯作者: 刘允中     E-mail: yzhliu@scut.edu.cn
Corresponding author: LIU Yunzhong     E-mail: yzhliu@scut.edu.cn
作者简介: 王凯冬,男,1995年生,硕士生

引用本文:

王凯冬, 刘允中, 詹强坤, 黄斌. 形核剂的添加方式对选区激光熔化成形含锆Al-Cu-Mg合金显微组织与力学性能的影响[J]. 金属学报, 2022, 58(10): 1281-1291.
Kaidong WANG, Yunzhong LIU, Qiangkun ZHAN, Bin HUANG. Effect of Adding Methods of Nucleating Agent on Microstructure and Mechanical Properties of Zr Modified Al-Cu-Mg Alloys Prepared by Selective Laser Melting[J]. Acta Metall Sin, 2022, 58(10): 1281-1291.

链接本文:

https://www.ams.org.cn/CN/10.11900/0412.1961.2021.00075      或      https://www.ams.org.cn/CN/Y2022/V58/I10/1281

图1  原材料的显微组织以及Al3Zr颗粒的XRD谱
图2  Al3Zr/Al-Cu-Mg和ZrH2/Al-Cu-Mg合金复合粉末的显微组织
图3  不同激光能量密度成形的不同成分沉积态Al-Cu-Mg合金的横截面显微组织的OM像
图4  添加与未添加形核剂的沉积态Al-Cu-Mg合金的相对致密度
图5  370 J/mm3激光能量密度成形的不同成分沉积态Al-Cu-Mg合金的纵截面显微组织
图6  370 J/mm3激光能量密度成形的不同成分的沉积态Al-Cu-Mg合金纵截面的反极图和晶粒尺寸分布图
图7  添加与未添加形核剂的沉积态Al-Cu-Mg合金的XRD谱
图8  370 J/mm3激光能量密度成形的直接添加Al3Zr的沉积态Al-Cu-Mg合金TEM像、SAED花样和EDS元素分布图
图9  370 J/mm3激光能量密度成形的含原位生成Al3Zr的沉积态Al-Cu-Mg合金的TEM像及SAED花样
图10  不同激光能量密度成形的不同成分沉积态含锆Al-Cu-Mg合金的SEM背散射像
ElementMass fractionAtomic fraction
Al52.8678.41
Cu2.631.66
Mg0.340.55
Zr44.1719.38
表1  图10c中团聚相的EDS分析结果 (%)
图11  370 J/mm3激光能量密度成形的热处理态含锆Al-Cu-Mg合金的SEM背散射像
图12  采用不同激光能量密度成形的不同成分Al-Cu-Mg合金的沉积态与热处理态试样的力学性能
图13  370 J/mm3激光能量密度成形的含锆Al-Cu-Mg合金沉积态与热处理态试样的断口形貌
图14  沉积态含锆Al-Cu-Mg合金中含锆相演变的示意图
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