TiB whisker induced variant selection in titanium matrix composites

被引：37

作者：

Le, Jianwen ^{[1
]}

Boehlert, C. J. ^{[3
]}

Huang, Guangfa ^{[1
]}

Mao, Jianwei ^{[1
]}

Lei, Liming ^{[4
]}

Han, Yuanfei ^{[1
,2
]}

Lu, Weijie ^{[1
,2
]}

机构：

[1] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China

[2] Shanghai Key Lab Adv High Temp Mat & Precis Formi, Shanghai 200240, Peoples R China

[3] Michigan State Univ, Dept Chem Engn & Mat Sci, E Lansing, MI 48824 USA

[4] AECC Commercial Aircraft Engine Co Ltd, Shanghai 200241, Peoples R China

来源：

SCRIPTA MATERIALIA | 2022年 / 217卷

基金：

中国国家自然科学基金; 国家重点研发计划;

关键词：

Metal matrix composites (MMC); TiB whisker; Electron backscattering diffraction (EBSD); Misorientation; Variant selection; ALPHA-PHASE TRANSFORMATION; GRAIN-GROWTH; BETA; MICROSTRUCTURE; MORPHOLOGY;

D O I：

10.1016/j.scriptamat.2022.114772

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Considerable studies confirmed the existence of multiple orientation relationships (ORs) between TiB whiskers and a precipitates in titanium matrix composites (TMCs), but the role of TiB on a variant selection has not been demonstrated. In this study, three preferred ORs between TiB and alpha variants were obtained from beta heat-treated TMCs by analyzing the misorientation angle/axis distributions, thereby confirming the selection of TiB whiskers for alpha variants. It was found that the grain refinement and equiaxed effect of TiB whiskers on the matrix microstructure are mainly reflected in the selected alpha variants. The dependence of the variant-selection degree on the cooling rate was investigated and the strongest variant selection of TiB whisker occurred at a cooling rate of 1 degrees C/s. In addition, reconstruction of the parent beta-phase revealed that the selected alpha variants heterogeneously nucleate from TiB and do not exhibit the Burgers relationship with the parent beta phase.

引用

页数：6

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