FGH4096合金γ’析出相的形态失稳研究  

Research on morphology instability of γ’ precipitates in FGH4096 superalloy

作　　者：田高峰[1] 陈阳 邹金文[1] 胡本芙[2] TIAN Gao-feng;CHEN Yang;ZOU Jin-wen;HU Ben-fu(Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials,Beijing 100095,China;School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京航空材料研究院先进高温结构材料重点实验室,北京100095 [2]北京科技大学材料科学与工程学院,北京100083

出　　处：《粉末冶金工业》2018年第6期23-27,共5页Powder Metallurgy Industry

基　　金：国家重点研发计划资助项目(2016YFB0701402)

摘　　要：对FGH4096镍基粉末高温合金在热处理过程中γ’析出相的两种典型形态失稳现象进行了观察和研究,揭示了其形态失稳机制和发生模式。结果表明:γ’相分裂作为一种“反粗化”现象,其驱动力是弹性应变能的释放,主要取决于γ’相间错配度与γ’相颗粒尺寸两个因素,当γ’相长大或粗化到一定尺寸,它需要通过自溶解释放弹性应变能以保证系统能量稳定;γ’相不稳定长出是当γ基体存在足够的过饱和度时,引起的点扩散效应造成相界面的不稳定性而形成的另一种γ’相形态失稳现象,由浓度梯度效应和表面张力效应两个因素决定。Two kinds of γ’ morphology instability during heat treatment process in powder metallurgy nickel-base superalloy FGH4096 were investigated, the instability mechanism and occurrence mode were revealed. The results indicate that the splitting driving force of γ’ precipitates as the reverse coarsening is the release of elastic strain energy, strongly depends on the lattice mismatch and the size of γ’ precipitates, when γ’ particle grows up to a certain size, it needs dissolve itself in order to keep the system energy stable through the release of the elastic strain energy. The unstable protrusion of γ’ precipitates is another morphology instability of γ’ precipitates, which is interfacial instability caused by point diffusion effect when the condition of enough supersaturation in the g matrix is met, determined by concentration gradient effect and surface tension effect.

关 键 词：粉末高温合金 γ'相 形态失稳 

分 类 号：TG132.3[一般工业技术—材料科学与工程]