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| Pd-20W合金的热压缩变形行为和显微组织 |
| Hot compression behavior and microstructure of Pd-20W alloy |
| Received:May 26, 2022 |
| DOI： |
| 中文关键词: Pd-20W合金 热压缩变形 真应力 本构方程 显微组织 |
| 英文关键词: Pd-20W alloy hot compression deformation flow stress constitutive equation microstructure |
| 基金项目:云南省重大科技项目(2018ZE001)；云南省重大科技专项(202002AB080001-1)；云南省基础研究-面上(202201AT070273) |
| Author Name | Affiliation | | ZHANG Jiming | Yunnan Precious Metals Laboratory Co. Ltd., State key Laboratory of Advanced Technology of ComprehensiveUtilization of Platinum Metals, Sino-platinum Metals Co. Ltd., Kunming 650106, China | | BI Qinsong | Yunnan Precious Metals Laboratory Co. Ltd., State key Laboratory of Advanced Technology of ComprehensiveUtilization of Platinum Metals, Sino-platinum Metals Co. Ltd., Kunming 650106, China | | YANG Youcai | Yunnan Precious Metals Laboratory Co. Ltd., State key Laboratory of Advanced Technology of ComprehensiveUtilization of Platinum Metals, Sino-platinum Metals Co. Ltd., Kunming 650106, China | | XIE Ming | Yunnan Precious Metals Laboratory Co. Ltd., State key Laboratory of Advanced Technology of ComprehensiveUtilization of Platinum Metals, Sino-platinum Metals Co. Ltd., Kunming 650106, China | | CHEN Yongtai | Yunnan Precious Metals Laboratory Co. Ltd., State key Laboratory of Advanced Technology of ComprehensiveUtilization of Platinum Metals, Sino-platinum Metals Co. Ltd., Kunming 650106, China | | FANG Jiheng | Yunnan Precious Metals Laboratory Co. Ltd., State key Laboratory of Advanced Technology of ComprehensiveUtilization of Platinum Metals, Sino-platinum Metals Co. Ltd., Kunming 650106, China | | LI Aikun | Yunnan Precious Metals Laboratory Co. Ltd., State key Laboratory of Advanced Technology of ComprehensiveUtilization of Platinum Metals, Sino-platinum Metals Co. Ltd., Kunming 650106, China | | WANG Saibei | Yunnan Precious Metals Laboratory Co. Ltd., State key Laboratory of Advanced Technology of ComprehensiveUtilization of Platinum Metals, Sino-platinum Metals Co. Ltd., Kunming 650106, China |
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| 中文摘要: |
| 采用Gleeble-3500热模拟试验机对Pd-20W合金进行热压缩试验，研究了合金在变形温度1000~1200 ℃、应变速率0.001~1.000 s-1条件下的流变应力以及变形过程中的显微组织。结果表明，合金的流变应力在变形初期随着真应变的增大快速上升，出现峰值应力后逐渐下降并达到稳态或略有下降。该合金热压缩变形的流变应力行为可用Zener-hollomon参数来描述，拟合计算得到了该材料的形变激活能等参数，获得流变应力的本构方程。热压缩变形后合金组织呈现一定程度的协同变形特征，晶界动态再结晶趋势增强，合金的主要软化机制为动态再结晶，表现出典型的应变诱发晶界形核机制特点。 |
| 英文摘要: |
| The hot compression test of Pd-20W alloy was performed on Gleeble-3500 thermal simulation machine. The flow stress and microstructural evolution during the deformation process of the alloy were investigated at a deformation temperature of 1000~1200 ℃ and a strain rate of 0.001~1 s-1. The results show that the flow stress of the alloy in the early deformation stage increases with the increase of the strain rate rapidly, and then the peak stress decreases gradually and reaches a steady state or decreases slightly. The flow stress can be described by a Zener-Hollomon parameter during hot compression deformation and material parameters such as activation energy can be calculated by linear fitting, thus the constitutive equation of flow stress can be presented finally. After hot compression deformation, the microstructure of the alloy exhibits a certain degree of synergetic deformation, and the dynamic recrystallization of grain boundaries increases. The main softening mechanism is dynamic recrystallization, revealing a typical strain-induced grain boundary nucleation mechanism. |
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