Nanoscale origins of the oriented precipitation of Ti3Al in TiAl systems

Nanoscale origins of the oriented precipitation of Ti3Al in TiAl systems
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Ti-Al 体系中 Ti3Al 定向沉淀的纳米级起源

DOI:
10.1016/j.scriptamat.2016.07.037
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发表时间:
2016-12
期刊:
影响因子:
6
通讯作者:
Meng Huang
Meng Huang
中科院分区:
材料科学1区
文献类型:
--
作者:
Hao Wu;Guohua Fan;Lin Geng;Xiping Cui;Meng Huang

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Ti3Al在Tisingle -键合al合金中的定向析出已被提出,但具体析出行为背后的物理机制尚不清楚。在这里,我们报告了在棱柱平面上优先形成堆积断层的起源。换句话说,Al合金化引起的层错是Ti3Al相析出的成核源,其特殊的空间分布有助于Ti3Al相的“取向”析出(取向析出)。这些发现丰富了目前对纳米尺度析出行为的理解,并为通过调整缺陷的物理类型和空间分布来控制析出行为提供了灵感。
Oriented precipitation of Ti3Al in Tisingle bondAl 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 Ti3Al phases, and their particularly spatial distributions assist in “orienting” Ti3Al 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.
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