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| 低磁化率Au-32Pt合金析出相调控及其对性能的影响 |
| Precipitated phase regulation of low susceptibility Au-32Pt alloy and its influence on properties |
| 投稿时间：2023-03-06 |
| DOI： |
| 中文关键词: Au-Pt合金 微观组织 硬度 磁化率 |
| 英文关键词: Au-Pt alloy solid solution treatment microstructure vickers hardness magnetic susceptibility |
| 基金项目:国家自然科学基金联合基金(U20A2077)；云南省基础研究计划青年基金(202101AU070123)；国家重点研发计划(2021YFC2202300)；云南省基础研究计划重点基金(202201AS070065) |
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| 中文摘要: |
| 采用金相显微镜、电子显微镜、X射线衍射仪、图像分析显微硬度计和综合物性测量系统等，研究铸态Au-32Pt合金塑性变形与退火过程中的初始析出相演变行为及其对合金力学性能和磁性能的影响。结果表明铸态Au-32Pt合金宏观偏析明显、晶粒粗大，凝固时形成了大尺寸(7.93 μm)、高Pt含量(＞80%)的颗粒状析出相。经塑性变形和退火处理后，初始析出相被破碎和拉长，形成大量均匀分布的亚微米级(0.1~0.4 μm)颗粒状析出相，以及少量的薄层状析出相。通过将粗大的富Pt析出相调控为分布均匀的细小析出相，明显提高了铸态合金硬度和体积磁化率的稳定性，硬度(HV0.1)从160±25提高到175±5，磁化率从(-18.05±5.50)×10-6优化到(-12.65±0.25)×10-6。 |
| 英文摘要: |
| Metallographic microscope, electron microscope, X-ray diffractometer, image analysis microhardness tester and comprehensive physical property measurement system were used to study the evolution behavior of the initial precipitated phase during the plastic deformation and annealing process of cast Au-32Pt alloy and its influence on the mechanical and magnetic properties of the alloy. The results showed that the cast Au-32Pt alloy had obvious macro segregation, coarse grains, and a granular precipitated phase with large size (7.93 μm) and high Pt content (>80%) was formed when solidified. After plastic deformation and annealing, the initial precipitated phase was elongated and broken, then a large number of uniformly distributed submicron-sized(0.1~0.4 μm)granular precipitated phases and a little thin layered precipitated phases are formed. The size and distribution of Pt-rich precipitated phases significantly affected the stability of Au-32Pt alloy. After adjusting the coarse Pt rich precipitated phase into a uniformly distributed fine precipitated phase, the stability of the hardness and volume susceptibility of the cast alloy was significantly improved, the hardness (HV0.1) was stabilized from 160±25 to 175±5, and the magnetic susceptibility was optimized from (-18.05±5.50)×10-6 to (12.65±0.25)×10-6. |
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