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金属学报    DOI: 10.11900/0412.1961.2025.00048
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热处理对电弧定向能量沉积Al-Zn-Mg-Cu-Sc合金显微组织与力学性能的影响
秦凤明,李亚菲,李亚杰,赵晓东,梁上上,陈金秋
太原科技大学 材料科学与工程学院  太原 030024
The Impact of Heat Treatment on the Microstructural Characteristics and Mechanical Properties of Al-Zn-Mg-Cu-Sc Alloy Prepared via Wire-Arc Directed Energy Deposition Process
QIN Fengming, LI Yafei, LI Yajie, ZHAO Xiaodong, LIANG Shangshang, CHEN Jinqiu

School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China

引用本文:

秦凤明 李亚菲 李亚杰 赵晓东 梁上上 陈金秋. 热处理对电弧定向能量沉积Al-Zn-Mg-Cu-Sc合金显微组织与力学性能的影响[J]. 金属学报, 10.11900/0412.1961.2025.00048.

全文: PDF(4963 KB)  
摘要: 

研究热处理对电弧定向能量沉积Al-Zn-Mg-Cu-Sc合金显微组织与力学性能的影响,对于优化该合金增材制造工艺、提升其综合性能具有重要意义。本工作以自制7075-Sc焊丝为原材料,采用冷金属过渡(CMT)工艺制备了无裂纹的Al-Zn-Mg-Cu-Sc厚壁合金构件。微观组织分析结果表明,沉积态合金由细小的等轴晶组成,平均尺寸约14 μm,晶界有连续第二相分布。在470 ℃、4 h的固溶工艺下,第二相溶解70.2%,残余第二相主要为Al7Cu2Fe和Al2Mg3Zn3。然后在120 ℃进行人工时效,力学性能测试结果表明最佳时效时间为18 h。经过固溶和时效处理后,合金的屈服强度、抗拉强度、伸长率分别为475.2 MPa、542.1 MPa和5.2%,与沉积态相比分别提高了52.8%、36.5%和36.8%。

关键词 Al-Zn-Mg-Cu-Sc合金电弧定向能量沉积热处理显微组织力学性能    
Abstract:Heat treatment can adjust the microstructure of wire-arc directed energy deposition Al-Zn-Mg-Cu-Sc alloy, thereby improving mechanical properties. In this study, crack-free thick-walled Al-Zn-Mg-Cu-Sc alloy components were fabricated using self - made 7075 - Sc welding wire as raw material and the CMT process. The results of microstructure analysis show that the as - deposited alloy is composed of fine equiaxed grains with an average size of approximately 14μm, and there is a continuous distribution of the second phase along the grain boundaries. Solution treatment at 470℃ demonstrates significantly decreased dissolution rate of secondary phases with prolonged duration, with 4h selected as optimal treatment time. Under the condition of 470 °C/4 h, 70.2% of the second phase is dissolved, and the remaining second - phase is mainly Al7Cu2Fe and Al2Mg3Zn3. Subsequently, artificial aging is performed at 120℃. The results of mechanical property tests elucidate that the optimal aging time is 18h. After solution treatment and aging treatment, the yield strength, tensile strength, and elongation of the alloy are 475.2Mpa, 542.1Mpa, and 5.2% respectively, which are increased by 52.8%, 36.5%, and 36.8% respectively compared with the as - deposited state.
Key wordsAl-Zn-Mg-Cu-Sc alloy,    Wire-arc directed energy deposition (DED),    Heat treatment,    microstructure,    Mechanical properties
收稿日期: 2025-02-24     
ZTFLH:  TG40  
基金资助:中央引导地方科技发展资金项目;太原科技大学科研启动资金项目;山西省自然科学基金
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