Unusual ordered phases with long periodic stacking structures in an additively manufactured TiAl alloy

Xinyu Zhang; Chuanwei Li; Qing Wang; Mengyao Zheng; Zhenhua Ye; Jianfeng Gu

doi:10.1080/21663831.2020.1804473

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Unusual ordered phases with long periodic stacking structures in an additively manufactured TiAl alloy

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- Unusual ordered phases with long periodic stacking structures in an additively manufactured TiAl alloy
- Unusual ordered phases with long periodic stacking structures in an additively manufactured TiAl alloy
- 材料研究快报（英文） 2020年8卷第12期页码：454-461
- 作者机构：
  
  1. a Institute of Materials Modification and Modelling School of Materials Science and Engineering Shanghai Jiao Tong University
  2. b Laboratory for Microstructures Institute of Materials Shanghai University
  3. a Institute of Materials Modification and Modelling School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai People’s Republic of China
  4. c Shanghai Key Laboratory of Materials Laser Processing and Modification Shanghai Jiao Tong University
- 作者简介：
- 基金信息：
- DOI：10.1080/21663831.2020.1804473
  中图分类号：
- 网络首发：2020-08-10，
  
  纸质出版：2020
- 稿件说明：
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Xinyu Zhang, Chuanwei Li, Qing Wang, 等. Unusual ordered phases with long periodic stacking structures in an additively manufactured TiAl alloy[J]. 材料研究快报（英文）, 2020,8(12):454-461.

Xinyu Zhang, Chuanwei Li, Qing Wang, et al. Unusual ordered phases with long periodic stacking structures in an additively manufactured TiAl alloy[J]. Materials Research Letters, 2020, 8(12): 454-461.
Xinyu Zhang, Chuanwei Li, Qing Wang, 等. Unusual ordered phases with long periodic stacking structures in an additively manufactured TiAl alloy[J]. 材料研究快报（英文）, 2020,8(12):454-461. DOI： 10.1080/21663831.2020.1804473.

Xinyu Zhang, Chuanwei Li, Qing Wang, et al. Unusual ordered phases with long periodic stacking structures in an additively manufactured TiAl alloy[J]. Materials Research Letters, 2020, 8(12): 454-461. DOI： 10.1080/21663831.2020.1804473.

摘要

Abstract

In the present work

we have extensively examined the alternative-band microstructure of a Ti-47Al-2Cr-2Nb alloy fabricated via direct laser deposition by means of high resolution transmission electron microscopy and selected area electron diffraction. The studied samples exhibit two types of long-periodic stacking ordered phase with 6H and 18R structures

which were never reported for those obtained by traditional approaches. Moreover

the ordered phases possess stacking sequences of ABCBACA and ABCABCBCABCACABCABA

being analogous to the periodically arranged stacking faults in α

and γ phases

respectively. With the presence of these unusual structures

the as-deposited sample tends to have superior mechanical properties.

IMPACT STATEMENT

Unusual ordered phases with long periodic stacking structures

seldom reported in the TiAl alloys obtained by traditional approaches

were comprehensively characterized

and demonstrated to possess excellent mechanical properties.

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