Alternative TitleDeformation-induced γ→DI-α2 phase transformation of TiAl alloys
陈春林; 鲁伟; 贺连龙; 叶恒强
Source Publication电子显微学报
Abstract本文运用高分辨电子显微术研究了TiAl合金中形变诱发的γ→DI-2α相变(本文中DI-表示形变诱发)。研究表明,无论是高温变形还是室温变形,形变诱发的γ→DI-α2相变都可在孪晶交截等孪晶受阻的区域内发生。尽管变形条件截然不同,但该相变却未表现出任何差异。高分辨观察表明,DI-α2相与γ基体之间仍然具有典型的取向关系:(001)DI-α2//{111}γ,11 20DI-α2//〈110〉γ。相变中,a/6〈11 2Shockley不全位错交替地在{111}γ面上运动使得堆垛顺序由有序的FCT型转变为非平衡的HCP结构,从而实现了结构的变化。X射线EDS成分分析表明,DI-α2相与γ基体的成分完全相同,相变过程中无成分扩散。强烈的应力场是TiAl合金中形变诱发γ→DI-2α相变的主要驱动力,对该相变的发生起主要作用。
Other AbstractThis paper has studied the deformation-induced γ→DI-α2 phase transformation of TiAl alloys using high-resolution electron microscopy. Studies revealed that the deformation-induced γ→DI-α2 phase transformation could occur in the regions where a deformation twin was blocked during both high-temperature and room-temperature deformations. Though the deformation conditions were completely different, these phase transformations have not exhibited any difference. High-resolution image observations of the deformation-induced DI-α2 phase suggested that the orientation relationship between the DI-α2 and γ phases remained the typical one: (0001)DI-α2//{111}γ, 11 20DI-α2// 〈 110 〉 γ- The conversion of stacking sequence from ordered FCT to ordered non-equilibrium HCP structure was accomplished by the movement of a/6 〈 11 2 Shockley partial dislocations on every other {111}γ plane. Compositional analysis based on X-ray energy dispersive spectroscopy (EDS) revealed that the DI-α2 phase had the same composition as the matrix γ phase and no compositional diffusion occurred. The strong stress concentration in the intersection region was the major force to induce the γ→DI-α2 phase transformation.
Keyword钛铝合金 高分辨电子显微术 形变诱发相变 孪晶交截
Indexed ByCSCD
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Cited Times:1[CSCD]   [CSCD Record]
Document Type期刊论文
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GB/T 7714
陈春林,鲁伟,贺连龙,等. 钛铝合金中的形变诱发γ→DI-α2相变[J]. 电子显微学报,2007,26.0(004):276-287.
APA 陈春林,鲁伟,贺连龙,&叶恒强.(2007).钛铝合金中的形变诱发γ→DI-α2相变.电子显微学报,26.0(004),276-287.
MLA 陈春林,et al."钛铝合金中的形变诱发γ→DI-α2相变".电子显微学报 26.0.004(2007):276-287.
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