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退火温度对选区激光熔化ZL205A合金组织和 性能的影响
Effect of Annealing Temperature on Microstructure and Mechanical Properties of ZL205A Alloy by Selective Laser Melting
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- DOI:
- 作者:
- 欧阳奇，汪志太，徐志锋，李仕豪，李泽铧
OUYANG Qi, WANG Zhitai, XU Zhifeng, LI Shihao, LI Zehua
- 作者单位:
- 南昌航空大学 轻合金加工科学与技术国防重点学科实验室，江西 南昌 330063
National Defense Key Discipline Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang 330063, China
- 关键词:
- 选区激光熔化；ZL205A 合金；退火温度；组织；性能
selective laser melting; ZL205A; annealing temperature; microstructure; mechanical properties
- 摘要:
- 采用选区激光熔化（SLM）成形 ZL205A 合金并对其进行退火处理，研究了退火温度对组织和力学性能的
影响。 结果表明，沉积态试样的组织由 θ(Al2Cu)相和 α-Al 基体组成；随着退火温度升高，Cu 元素以颗粒状分布在铝基体
中，使晶粒尺寸变大，组织中无新相生成。 退火处理后，试样的伸长率大幅度提高，抗拉强度、屈服强度和显微硬度均呈
下降趋势，拉伸断口为韧性断裂特征。 在 250~300 ℃退火 2 h，伸长率较沉积态分别提升 14.3%和 28.6%，且强度优于沉
积态。
ZL205A alloy was formed by selective laser melting (SLM) and annealed. The effects of annealing temperature on microstructure and mechanical properties of ZL205A alloy were studied. The results show that the microstructure of the specimen is composed of θ (Al2Cu) phase and α-Al matrix. With the increase of annealing temperature, Cu particles are distributed in the Al matrix, which makes the grain size increase, and no new phases are formed in the microstructure. After annealing, the elongation of the sample increases greatly, the tensile strength, yield strength and microhardness all decrease, and the tensile fracture is ductile fracture. When annealed at 250~300 ℃ for 2 h, the elongation increases by 14.3% and 28.6%, respectively, and the strength is better than that of the deposited state.