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作者:

Ma, X. Z. (Ma, X. Z..) | Xiang, Z. L. (Xiang, Z. L..) | Ma, M. Z. (Ma, M. Z..) | Tan, C. (Tan, C..) | Yang, Z. A. (Yang, Z. A..) | Shen, G. L. (Shen, G. L..) | Chen, Z. Y. (Chen, Z. Y..) (学者:陈子勇) | Shu, Q. (Shu, Q..)

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EI Scopus SCIE

摘要:

B-free and B-containing near a titanium alloys were fabricated by induction skull melting method. Microstructures, textures, mechanical properties and fracture behaviors were investigated. Observations of as-casted microstructures revealed that prior beta grains and alpha colonies were obviously refined after adding trace boron element, and widmannstatten structure of B-free alloy transformed to basket-weave structure of B-containing alloy. For as-forged alloys, prior beta grains were broken and squashed, and they stretched along direction perpendicular to forging direction. TiB whiskers promoted dynamic recrystallization behavior, which led to the precipitation of more equiaxed alpha grains around them. Texture intensity of overall alpha phase obviously decreased after the addition of trace boron element, which manifested that TiB whiskers prohibited texture formation and improved microstructure homogeneity. B-containing alloy exhibited excellent combination of room temperature (RT) and high temperature (650 degrees C) mechanical properties. Fracture characteristics of B-free and B-containing alloys were dominant by abundant dimples and cleavage fracture of alpha lamellas during RT tensile processes. At 650 degrees C, the cleavage fracture of alpha lamellas was replaced by dimples, illustrating ductile fracture characteristics. Longitudinal and transverse fracture of TiB whiskers existed no matter at RT or at 650 degrees C for B-containing alloy. By observations of lateral surfaces, cracks and voids were easier to generate at boundaries between grains and colonies with large size for B-free alloy. For B-containing alloy, comparing with macro-zones in matrix, voids were inclined to generate around interfaces of TiB whiskers and matrix due to strain mismatch. It illustrated TiB whiskers accelerated the fracture of alloy. Voids, transverse fracture of TiB whiskers and lateral abhesion of TiB whiskers were detected at RT, while lateral abhesion of TiB whiskers was seldom discovered during 650 degrees C tensile process.

关键词:

TiB whiskers Mechanical properties B-containing alloy Fracture behaviors Textures

作者机构:

  • [ 1 ] [Ma, X. Z.]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 2 ] [Xiang, Z. L.]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 3 ] [Tan, C.]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 4 ] [Yang, Z. A.]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 5 ] [Shen, G. L.]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 6 ] [Chen, Z. Y.]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 7 ] [Shu, Q.]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 8 ] [Ma, M. Z.]Yanshan Univ, State Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Hebei, Peoples R China

通讯作者信息:

  • 陈子勇

    [Chen, Z. Y.]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China

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来源 :

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

ISSN: 0921-5093

年份: 2020

卷: 772

6 . 4 0 0

JCR@2022

ESI学科: MATERIALS SCIENCE;

ESI高被引阀值:169

被引次数:

WoS核心集被引频次: 29

SCOPUS被引频次: 25

ESI高被引论文在榜: 0 展开所有

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