热等静压处理对ZL205A合金组织的影响  

Effect of Hot Isostatic Pressing Treatment on Micro-Structure of ZL205A Alloy

作　　者：冯广召 李少楠 程运超 柳森 周耀忠 FENG Guang-zhao;LI Shao-nan;CHENG Yun-chao;LIU Sen;ZHOU Yao-zhong(Beijing Xinghang Electro-mechanical Equipment Co.,Ltd.,Beijing 100074,China)

机构地区：[1]北京星航机电装备有限公司,北京100074

出　　处：《铸造》2021年第9期1043-1046,共4页Foundry

摘　　要：对经过与未经过热等静压处理的ZL205A合金的组织和性能进行了对比研究。结果表明,ZL205A合金力学性能与显微组织之间存在一定关系。经热等静压处理后,合金中Al_(2)Cu强化相在晶界的偏聚量减少,T相在组织中的弥散程度加强,合金显微组织中出现了一次枝晶的熔断与消失,提高了合金的力学性能。其原因一方面是显微孔洞等缺陷在高温蠕变作用下形成闭合,另一方面是在高温、高压作用下,合金组织中的空位扩散与位错扩散作用增强,显微孔洞闭合界面发生熔合,枝晶组织减少,强化相弥散程度增加,从而使合金的力学性能提高,且力学性能值的分散程度降低。The microstructure and performance of ZL205A alloy with&without hot isostatic pressing(HIP)treatment were comparatively studied.The results indicate that there is a certain relationship between the microstructure and performance of ZL205A alloy.After HIP treatment,the segregation of Al_(2)Cu phase on the crystal boundary decreases and the distribution of T phase in the microstructure is more uniform.It is also found that the first dendrites in the microstructure are broken and disappeared.Thus the mechanical properties of the alloy are improved.The reason of performance improvement is that on one hand,the micro-porosity in the microstructure is closed under the action of creep at high temperature,and on the other hand,under the action of high temperature and high pressure,the diffusion of vacancy and dislocation is reinforced in the microstructure of the alloy,and the interface between the boundaries of the closed pores and the miroporosity is merged,then the dendrites in the microstructure of the alloy are decreased and the distribution of the strengthening phases is more uniform,thus improveing the performance of the alloy and reducing the dispersibility of the performance values.

关 键 词：热等静压 蠕变 扩散 晶界强化 ZL205A合金 

分 类 号：TG146.21[一般工业技术—材料科学与工程]