自然科学版 英文版
自然科学版 英文版
自然科学版 英文版

您目前所在的位置:首页 - 期刊简介 - 详细页面

中南大学学报(英文版)

Journal of Central South University

Vol. 27    No. 9    September 2020

[PDF Download]    [Flash Online]

    

Microstructure and hot corrosion resistance of Si-Al-Y coated TiAl alloy
LI Yong-quan(李涌泉)1, 2, XIE Fa-qin(谢发勤)2, YANG Shao-lin(杨少林)1

1. School of Materials Science & Engineering, North Minzu University, Yinchuan 750021, China;
2. School of Aeronautics, Northwestern Polytechnical University, Xi’an 710072, China

Abstract:In order to obtain a high-performance surface on TiAl alloy that can meet the requirements in hot corrosion environment, Si-Al-Y coatings were fabricated by pack cementation process at 1050℃ for 4 h. Corrosion behaviors of the TiAl alloy with and without Si-Al-Y coatings are compared to illustrate the factors and corresponding mechanism in molten salt environment of 25wt% K2SO4 and 75wt% Na2SO4 at 900 °C. The obtained Si-Al-Y coating was mainly composed of a TiSi2 outer layer, a (Ti, X )5Si4 and (Ti, X )5Si3 ( X represents Nb or Cr element) middle layer, a TiAl2 inner layer and a Al-rich inter-diffusion zone. The inter-phase selective corrosion containing corrosion pits extending along α2 phase from lamellar interfaces in hot corrosion tested TiAl alloy was observed. However, by being coated with Si-Al-Y coating, the hot corrosion performance of TiAl alloy was improved remarkably.

 

Key words: TiAl alloy; Si-Al-Y coating; structure; hot corrosion

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
版权所有:《中南大学学报(自然科学版、英文版)》编辑部
地 址:湖南省长沙市中南大学 邮编: 410083
电 话: 0731-88879765(中) 88836963(英) 传真: 0731-88877727
电子邮箱:zngdxb@csu.edu.cn 湘ICP备09001153号