Microstructure evolution and corrosion mechanism of in situ synthesized TiC/TC4 alloy nanocomposites fabricated by laser powder bed fusion

被引：28

作者：

Bai, Peikang ^{[1
,2
]}

Huo, Pengcheng ^{[1
,2
]}

Zhao, Zhanyong ^{[2
]}

Du, Wenbo ^{[3
]}

Zhang, Zhen ^{[2
]}

Wang, Liqing ^{[2
]}

机构：

[1] Taiyuan Univ Sci & Technol, Coll Mat Sci & Engn, Taiyuan 030024, Peoples R China

[2] North Univ China, Sch Mat Sci & Engn, Taiyuan 030051, Peoples R China

[3] Army Acad Armored Forces, Natl Key Lab Remfg, Beijing 100072, Peoples R China

来源：

CERAMICS INTERNATIONAL | 2023年 / 49卷 / 02期

基金：

中国博士后科学基金;

关键词：

Laser powder bed fusion; TC4; alloy; TiC reinforcements; TiCl6]2-complexes; Passivation; MELTED TI-6AL-4V ALLOY; SIMULATED BODY-FLUID; ELECTROCHEMICAL CORROSION; PITTING SUSCEPTIBILITY; PASSIVE FILMS; BEHAVIOR; RESISTANCE; TI; TEXTURE;

D O I：

10.1016/j.ceramint.2022.09.257

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The corrosion mechanism and microstructure evolution of TC4 alloy and TiC/TC4 alloy nanocomposite manufactured by laser powder bed fusion (LPBF) were evaluated comparatively using electrochemical measurements combined with microstructure characterisations. The compelling microstructural results showed that refined grains, fewer defects and stronger texture strength were the dominating internal factor for enhancing the corrosion resistance of TiC/TC4 alloy nanocomposites. Further, a uniform distribution of in situ formed nanoscale TiC reinforcements significantly promoted the formation of [TiCl6]2- complexes, yielding the passivation formed again. These findings revealed that the elevated corrosion performance of LPBF-built TiC/TC4 alloy nanocomposites is due to the nanoscale TiC and strengthened microstructure inhibiting the occurrence of pitting corrosion in the alloy system during the corrosion process.

引用

页码：2752 / 2764

页数：13