李承润,雷嘉龙,孙雯雯,等.Cu-Zr-Cr合金热变形行为及微观组织研究[J].精密成形工程,2024,16(9):84-94.
LI Chengrun,LEI Jialong,SUN Wenwen,et al.Hot Deformation Behavior and Microstructure of Cu-Zr-Cr Alloy[J].Journal of Netshape Forming Engineering,2024,16(9):84-94. |
| Cu-Zr-Cr合金热变形行为及微观组织研究 |
| Hot Deformation Behavior and Microstructure of Cu-Zr-Cr Alloy |
| 投稿时间：2024-06-29 |
| DOI：10.3969/j.issn.1674-6457.2024.09.009 |
| 中文关键词: Cu-Zr-Cr合金 热变形 微观组织 流变应力 本构方程 |
| 英文关键词: Cu-Zr-Cr alloy hot deformation microstructure flow stress constitutive equations |
| 基金项目:河南省自然科学基金(232300420089);中国博士后科学基金(2023TQ0107) |
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| 中文摘要: |
| 目的 探究应变速率、变形温度及Cr含量对Cu-Zr-Cr合金组织与性能的影响。方法 采用真空熔炼法制备了Cu-0.3Zr-0.05Cr和Cu-0.3Zr-0.15Cr合金。热锻后，使用Gleeble-1500型热模拟试验机分别对2种合金在温度为750~900 ℃、反应速率为0.003~1 s−1的条件下进行热压缩实验。绘制了2种合金在不同热变形条件下的真应力-真应变曲线，建立了本构方程，绘制了Cu-0.3Zr-0.15Cr合金的热加工图，观察并分析了合金的微观组织。对温度850 ℃、应变速率1 s−1条件下热压缩Cu-0.3Zr-0.15Cr合金进行了TEM观察。结果 流变应力随变形温度的升高而降低，随应变速率的增大而增大。Cu-0.3Zr-0.05Cr和Cu-0.3Zr-0.15Cr合金的热激活能分别为488.9 kJ/mol和491.3 kJ/mol，确定了Cu-0.3Zr-0.15Cr合金的最佳加工区域。当Cu-0.3Zr-0.05Cr和Cu-0.3Zr-0.15Cr合金在850 ℃、应变速率1 s−1下进行热压缩实验时，垂直于压缩方向的晶粒尺寸分别为25 μm和21.4 μm。Cu-0.3Zr-0.15Cr合金中存在2种析出相，分别为细小Cr析出相和粗大未溶解的Cu5Zr相，尺寸分别约为10 nm和840 nm。结论 Cu-Zr-Cr合金在850 ℃、应变速率为1 s−1的条件下进行热变形时具有较好的晶粒细化效果，Cr元素的增加会细化晶粒并且提高合金的热激活能，改善合金的热加工性能。 |
| 英文摘要: |
| The work aims to investigate the effects of strain rate, deformation temperature and Cr content on the microstructure and properties of Cu-Zr-Cr alloy. Cu-0.3Zr-0.05Cr and Cu-0.3Zr-0.15Cr alloys were prepared by vacuum melting. After hot forging, the hot compression experiments of the two alloys were carried out at 750-900 ℃ under the reaction rate of 0.003-1 s−1 by Gleeble-1500 thermal simulation testing machine. True stress-strain curves of the two alloys under different hot deformation conditions were plotted experimentally, and a constitutive equation was established, and a hot processing map of Cu-0.3Zr-0.15Cr alloy was drawn. The microstructure of the alloys was observed and analyzed. The TEM observation of the hot-compressed Cu-0.3Zr-0.15Cr alloy at 850 ℃ under the strain rate of 1 s−1 was carried out. It was found that the flow stress decreased with the increase of deformation temperature and increased with the increase of strain rate. The thermally activated energies of Cu-0.3Zr-0.05Cr alloy and Cu-0.3Zr-0.15Cr alloy were 488.9 kJ/mol and 491.3 kJ/mol, respectively. The optimal machining area of Cu-0.3Zr-0.15Cr alloy was determined. The study found that the grain sizes perpendicular to the compression direction of Cu-0.3Zr-0.05Cr and Cu-0.3Zr-0.15Cr alloys were 25 μm and 21.4 μm, respectively, when the hot compression test was performed at 850 ℃ under the strain rate of 1 s−1. There were two precipitated phases in Cu-0.3Zr-0.15Cr alloy, which were fine Cr precipitated phases and coarse undissolved Cu5Zr phases, with sizes of about 10 nm and 840 nm, respectively. In conclusion, Cu-Zr-Cr alloy has a good grain refinement effect when it is thermally deformed at 850 ℃ under a strain rate of 1 s−1, and the increase of Cr element will refine the grains, increase the heat activation energy of the alloy, and improve the hot processing performance of the alloy. |
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