Nanoscale origins of the oriented precipitation of Ti3Al in TiAl systems. (December 2016)

• Record Type: Journal Article
• Authors: Wu, Hao; Fan, Guohua; Geng, Lin; Cui, Xiping; Huang, Meng
• Is Part Of: Scripta materialia. Volume 125(2016)
• Page Start: 34
• Page End: 38
• Publication Date: 2016-12
• Subjects: Titanium alloys -- Solid solution -- Stacking faults -- Precipitation -- Transmission electron microscopy (TEM); Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2016.07.037
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Oriented precipitation of Ti3 Al in TiAl alloys has been already proposed, however the underlying physical mechanism behind the specific precipitation behavior is still unclear. Here, we report that the origin is preferred formation of stacking faults on prismatic planes. In other words, stacking faults induced by Al alloying act as nucleation sources for the precipitation of Ti3 Al phases, and their particularly spatial distributions assist in "orienting" Ti3 Al precipitates (oriented precipitation). These findings enrich current understanding of nanoscale precipitation behavior, and provide the inspiration of controlling the precipitation behavior by tailoring the physical type and spatial distribution of defects. Graphical abstract: