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| 定向凝固Ag-28Cu-xNi系合金的组织和性能研究 |
| Study on microstructure and properties of directionally solidified Ag-28Cu-xNi alloy |
| Received:August 17, 2021 |
| DOI： |
| 中文关键词: Ag-28Cu-xNi合金 冷拉拔变形 组织结构 形貌 力学性能 |
| 英文关键词: Ag-28Cu-xNi alloy cold drawing deformation microstructure morphology mechanical properties |
| 基金项目:国家科技部“科技助力经济2020”重点专项；云南省稀贵金属材料基因工程(202002AB080001-1)；云南省2019材料基因工程项目(2019ZE001-2)；云南省科技人才与平台计划(202105AE160027) |
| Author Name | Affiliation | | ZHAO Jun | State Key Laboratory of New Technologies for Comprehensive Utilization of Rare and Precious Metals, Sino-Platinum Co.Ltd., Kunming 650106, China | | WANG Jian-ping | State Key Laboratory of New Technologies for Comprehensive Utilization of Rare and Precious Metals, Sino-Platinum Co.Ltd., Kunming 650106, China | | WEI Ming-xia | China Aviation Development Shenyang Liming Aero Engine Co., Ltd., Shenyang 110043, China | | ZHANG Nai-qian | China Aviation Development Shenyang Liming Aero Engine Co., Ltd., Shenyang 110043, China | | YANG You-cai | Kunming Institute of Precious Metals, Kunming 650106, China | | ZHAO Tong-ming | Kunming Institute of Precious Metals, Kunming 650106, China | | BI Ya-nan | Kunming Institute of Precious Metals, Kunming 650106, China | | XIE Ming | Kunming Institute of Precious Metals, Kunming 650106, China |
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| 中文摘要: |
| 采用定向凝固技术，制备了Ag-28Cu-xNi (x=0、0.75、1.0、2.0)系4类合金棒材，采用金相显微镜、透射电镜、扫描电镜研究了合金的显微组织结构和断口形貌；采用万能电子实验机，研究了合金的力学性能。结果表明，定向凝固Ag-28Cu合金的显微组织为竖直生长的柱状晶组织，Ag-28Cu-0.75Ni合金的显微组织为不同方向生长的树枝晶组织，Ag-28Cu-1Ni和Ag-28Cu-2Ni合金的显微组织为块状+花瓣状枝晶组织。随着冷拉拔变形真应变从η=3.22逐渐增大到η=6.0，Ag-28Cu-xNi系合金呈现出抗拉强度逐渐升高、延伸率逐渐下降的变化趋势；Ni元素的添加使Ag-28Cu合金的硬度、强度和延伸率均有不同程度的减小。Ag-28Cu-0.75Ni合金的室温拉伸断口形貌呈现有明显的缩颈现象和大量的韧窝，其断裂机制为微孔聚集型塑性断裂。 |
| 英文摘要: |
| Four types of alloy bars of Ag-28Cu-xNi (x=0, 0.75, 1.0, 2.0) series were prepared using directional solidification technology. The microstructure and fracture morphology of the alloy were studied by metallurgical microscope, transmission electron microscope, and scanning electron microscope. Using a universal electronic experiment machine, the mechanical properties of the alloy were studied. The results show that the microstructure of the directionally solidified Ag-28Cu alloy is a vertically grown columnar crystal structure, the microstructure of the Ag-28Cu-0.75Ni alloy is a dendritic structure grown in different directions, and the microstructures of the Ag-28Cu-1Ni and Ag-28Cu-2Ni alloys are block + petals. Shaped dendrite organization. As the true strain of cold drawing deformation gradually increases from η=3.22 to η=6.0, Ag-28Cu-xNi alloys show a trend of increasing tensile strength and decreasing elongation; the addition of Ni makes the hardness of Ag-28Cu alloy, The strength and elongation have been reduced to varying degrees. The tensile fracture morphology of Ag-28Cu-0.75Ni alloy at room temperature shows obvious necking phenomenon and a large number of dimples, and its fracture mechanism is microporous aggregation type plastic fracture. |
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