3D打印钛合金晶界中的伯氏取向差观测方法

3D打印钛合金晶界中的伯氏取向差观测方法

原效坤^*，张跃飞，吉  元，魏崇斌

(1. 北京工业大学，材料与制造学部，北京100124；2. 北京爱康宜诚医疗器材有限公司，北京102299)

摘  要  本文在密切关注新兴增材制造技术所产生的微观结构组织特征的同时，具体选取一种3D打印Ti-6Al-4V合金，分析其中的伯氏取向差结构。利用扫描电镜（SEM）、电子背散射衍射(EBSD)和统计性的五参数法，首先标定了合金结构中大量存在的α/α晶界，其次统计了α/α晶界的惯习面分布状况，之后对5种伯氏取向差分别进行了晶面取向织构分析，最后对5种伯氏取向差进行了晶界面理论结构计算。本文提出了α/α晶界识别判据并继而实现了在α/α晶界上进行伯氏取向差的准确表征，因而从具体观测技术层面发展了特定晶界的提取技术和典型取向差的结构分析技术。

关键词  扫描电子显微镜；电子背散射衍射；观测技术；伯氏取向差；3D打印钛合金

中图分类号：O766⁺.1；O761；O763 

文献标识码：A   doi:10.3969/j.issn.1000-6281.2022.01.006

Observation methods of Burgers misorientations in a 3D-printed titanium alloy

YUAN Xiao-kun¹，ZHANG Yue-fei¹，JI Yuan¹，WEI Chong-bin²

(1. Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124；

Beijing AK Medical Co. Ltd., Beijing 102299, China)

Abstract   The work concerns the structural features of the emerging additive manufacturing method, which in detail, selects a 3D-printed Ti-6Al-4V alloy as the sample and studies the boundary structure of the Burgers misorientations. By using scanning electron microscopy, electron backscatter diffraction (EBSD) and statistical grain boundary structure analysis methods (the Five Parameter Analysis method), the α/α boundaries are accurately sorted; and then, the habit planes of the α/α boundaries are analyzed; third, the orientation texture of boundary planes of five Burgers misorientations are counted; and finally, the geometrically characteristic boundaries of Burgers misorientations are calculated. By performing an α/α boundary sort method, the work in-turn achieves accurate characterization of Burgers misorientations among α/α boundaries. Therefore, this study develops the extraction method of specific boundaries as well as the interface structure analysis method of specific misorientations.

Keywords   scanning electron microscopy；electron backscattered diffraction；measurement method；Burgers misorientations；3D-printed Ti-6Al-4V alloy

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[1] 王宇轩，孙威. 亚稳β型Ti-25Nb-25Ta合金{332}<113>变形孪晶交互作用的电子显微研究[J]. 电子显微学报，2019，38(4):334-339.

[2] ROHRER G. Grain boundary energy anisotropy: a review [J]. Journal of the Materials Science，2011，466(18):5881-5895.

[3] BELADI H，CHAO Q，ROHRER G. Variant selection and intervariant crystallographic planes distribution in martensite in a Ti-6Al-4V alloy [J]. Acta Materialia，2014，80：478-489.

[4] RANDLE V.  The coincidence site lattice and the 'sigma enigma' [J]. Materials Characterization, 2001,47(5):411-416.

[5] HU Y, RANDLE V. An electron backscatter diffraction analysis of misorientation distributions in titanium alloys[J]. Scripta Materialia，2007，56(12):1051-1054.

[6] WANG J，BEYERLEIN I J. Atomic structures of symmetric tilt grain boundaries in hexagonal close packed (hcp) crystals [J].  Modelling and Simulation in Materials Science and Engineering, 2012，20(2):024002.

[7] BURGERS W G. On the process of transition of the cubic-body-centered modification into the hexagonal-close-packed modification of zirconium [J]. Physica，1934，1(7-12):561-586.

[8] KLOSTERMANN J A. The concept of the habit plane and the phenomenological theories of the martensite transformation [J]. Journal of the Less Common Metals, 1972，28(1):75-94.

[9] YUAN Xiao-kun，ROHRER G，SONG Xiao-yan，et al. Modeling the interface area aspect ratio of carbide grains in WC-Co composites [J]. International Journal of Refractory Metals and Hard Materials，2014，44:7-11.

[10] SAYLOR D M, ROHRER G S. Determining crystal habits from observations of planar sections [J]. Journal of the American Ceramic Society，2010，85(11):2799-2804.

[11] SAYLOR D M，EL-DASHER B，BRENT A，et al. Measuring the five-parameter grain-boundary distribution from observations of planar sections [J]. Metallurgical and Materials Transactions A，2004，35(7):1981-1989.

[12] http://mimp.materials.cmu.edu/~gr20/grain_boundary_data_archive

[13] GLOWINSKI K, MORAWIEC A. Twist, tilt, and symmetric grain boundaries in hexagonal materials [J]. Journal of Materials Science, 2014，49:3936-3942.

[14] GAO Xiong-xiong，ZENG Wei-dong, ZHANG Sai-fei, et al. A study of epitaxial growth behaviors of equiaxed alpha phase at different cooling rates in near alpha titanium alloy [J]. Acta Materialia，2017，122:298-309.

[15] MIRONOV S, ZHANG Y, SATO Y S, et al. Crystallography of transformed β microstructure in friction stir welded Ti-6Al-4V alloy [J].  Scripta Materialia，2008，59(5):511-514.

[16] SHI R, DIXIT V, FRASER H L, et al. Variant selection of grain boundary α by special prior β grain boundaries in titanium alloys [J].  Acta Materialia，2014，75:156-166.

[17] FARABI E, HODGSON P, ROHRER G. Five-parameter intervariant boundary characterization of martensite in commercially pure titanium [J].  Acta Materialia，2018，154:147-160.

[18] WANG S C, AINDOW M, STARINK M J. Effect of self-accommodation on α/α boundary populations in pure titanium [J]. Acta Materialia，2003，51(9):2485-2503.