弥散强化对PtRh10高温力学性能及微观形貌的影响  

The influence of dispersion strength on the high temperaturemechanical properties and microstructure of PtRh10 alloy

作　　者：吴保安 李凤 唐会毅 肖雨辰 杨晓亮 喻峰 蔡欣男 杨子明 WU Baoan;LI Feng;TANG Huiyi;XIAO Yuchen;YANG Xiaoliang;YU Feng;CAI Xinnan;YANG Ziming(Chongqing Materials Research Institute Co., Ltd,Chongqing 400707,China;National Engineering Research Center for Instrument Functional Materials,Chongqing 400707,China;Chongqing Engineering Research Center of Rare and Precious Metals High Effective Application,Chongqing 400707, China)

机构地区：[1]重庆材料研究院有限公司,重庆400707 [2]国家仪表功能材料工程技术研究中心,重庆400707 [3]重庆市稀贵金属高效应用工程技术研究中心,重庆400707

出　　处：《功能材料》2021年第5期5216-5220,共5页Journal of Functional Materials

基　　金：中国机械工业集团有限公司重点研发资助项目(SINOMACH2017科247号);重庆市技术创新与应用发展专项重点资助项目(cstc2019jscx-mbdxX0001)。

摘　　要：通过对弥散强化的铂铑10合金(4GC1-QPR10)和普通铂铑10合金(4GC1-PR10)进行1400℃高温拉伸试验和蠕变断裂寿命试验,并用光学显微镜(OM)、扫描电子显微镜(SEM)观察和分析断口附近的表面形貌、金相以及断口的微观组织结构,对比性地研究了二者在高温环境下的力学性能及微观组织变化,结果表明,在1400℃的高温拉伸和蠕变断裂寿命试验中,4GC1-QPR10的抗拉强度和屈服强度均明显高于4GC1-PR10,并保持相对高的延伸率,且在恒定载荷下,蠕变断裂寿命提升明显;4GC1-PR10晶粒严重长大,而4GC1-QPR10断口附近的晶粒仍然保持着纤维状组织,晶粒未明显长大;4GC1-QPR10和4GC1-PR10断口均为韧窝状,但4GC1-PR10断口处韧窝尺寸大小不均匀,而4GC1-QPR10断口处韧窝细小、密集,并在韧窝中或是韧窝周围均匀地分布着第二相颗粒。In order to study the mechanical properties and microstructural change of dispersion strengthened PtRh10(4GC1-QPR10)and ordinary PtRh10(4GC1-PR10)under high temperature,tensile tests and creep rupture life test were conducted on 4GC1-QPR10 and 4GC1-PR10 at 1400℃,The microstructures of the fractures and the surface morphologies near the fractures were observed by optical microscope(OM)and scanning electron microscope(SEM).The results showed that,In the high temperature tensile test and creep rupture life test at 1400℃,the tensile strength and yield strength of 4GC1-QPR10 were significantly higher than 4GC1-PR10,and remained relatively high elongation,under the constant load,the creep rupture life of 4GC1-QPR10 increased obviously.The grains of 4GC1-QPR did not grow significantly and still keep fibrous structure,while 4GC1-PR10 grains were seriously grown.The fractures of 4GC1-QPR10 and 4GC1-PR10 were dimpled fractures,the size of the dimples were not uniform of 4GC1-PR10,but the dimples of fracture were small and densely arranged of 4GC1-QPR10,and the fine black particles were uniformly distributed within the grains and grain boundaries.

关 键 词：弥散强化 高温拉伸 蠕变断裂寿命 断口组织 

分 类 号：TG146.3[一般工业技术—材料科学与工程]