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| 弥散强化对铂基材料拉伸性能的影响 |
| Effect of Dispersion-Strengthened on Tensile Properties of Platinum-based Materials |
| 投稿时间：2019-12-17 |
| DOI： |
| 中文关键词: 铂基材料 氧化锆 弥散强化 拉伸试验 断口形貌 |
| 英文关键词: platinum-based materials zirconium oxide dispersion strengthening tensile test fracture morphology |
| 基金项目:中国机械工业集团有限公司技术开发专项(SinoMach2017科247号)；重庆市技术创新与应用示范产业类重点研发项目(cstc2018jszx-cyzdX0075)；重庆市技术创新与应用发展专项重点项目(cstc2019jscx-mbdxX0001) |
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| 中文摘要: |
| 对普通和氧化锆弥散强化的铂基材料分别进行了常温和1000℃高温拉伸试验，用光学和扫描电子显微镜对断口及其附近区域的表面形貌和微观组织结构进行了观测。结果表明，在拉伸实验中弥散强化型铂基材料的抗拉强度和屈服强度高于普通铂基材料；弥散强化型铂基材料断口呈韧窝状，且韧窝中能观察到第二相(氧化锆颗粒)的存在。高温拉伸时，由于氧化锆颗粒的弥散强化作用，降低晶界扩散速度，减缓位错攀移，阻止晶粒长大和晶界滑移，提高了铂基材料的强度。 |
| 英文摘要: |
| Tensile tests were conducted on ordinary platinum-based materials and zirconia dispersion strengthened platinum-based materials at room temperature and 1000°C respectively. The surface morphology and microstructure of the fracture and its adjacent area were observed with optical microscope and scanning electron microscope. The results showed that the tensile strength and yield strength of zirconia dispersion strengthened platinum-based materials were higher than those of ordinary platinum-based materials. The fractures of zirconia dispersion strengthened platinum-based materials were dimple-like, and the second phase (zirconia particles) can be observed in the dimples. During high temperature stretching, due to the dispersion strengthening effect of zirconia particles, the grain boundary diffusion rate was reduced, and dislocation climbing was slowed down, and the grain growth and grain boundary slippage were prevented, and the strength of platinum-based materials was improved. |
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