Effects of Ti on the Microstructure and Fracture Toughness of TaCr<sub>2</sub> Alloys Containing Laves Phase

Ma Wenjun; Xiao Xuan; Yao Jing; Zeng Yuan; Zhou Kai

doi:10.15980/j.tzzz.2018.01.019

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Effects of Ti on the Microstructure and Fracture Toughness of TaCr₂ Alloys Containing Laves Phase
Vol. 38, Issue 1, Pages: 71-74(2018)
Published： 2018 ，
DOI： 10.15980/j.tzzz.2018.01.019

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[1]马文军,肖璇,姚敬,曾媛,周凯.Ti对Laves相TaCr_2显微组织及断裂韧度的影响[J].特种铸造及有色合金,2018,38(01):71-74.

Ma Wenjun, Xiao Xuan, Yao Jing, et al. Effects of Ti on the Microstructure and Fracture Toughness of TaCr₂ Alloys Containing Laves Phase. [J]. Special Casting & Nonferrous Alloys 38(1):71-74(2018)
[1]马文军,肖璇,姚敬,曾媛,周凯.Ti对Laves相TaCr_2显微组织及断裂韧度的影响[J].特种铸造及有色合金,2018,38(01):71-74. DOI： 10.15980/j.tzzz.2018.01.019.

Ma Wenjun, Xiao Xuan, Yao Jing, et al. Effects of Ti on the Microstructure and Fracture Toughness of TaCr₂ Alloys Containing Laves Phase. [J]. Special Casting & Nonferrous Alloys 38(1):71-74(2018) DOI： 10.15980/j.tzzz.2018.01.019.

摘要

通过机械合金化+热压烧结工艺制备了Cr-33.3Ta和Cr-26.6Ta-20Ti合金

研究了Ti对Laves相TaCr

显微组织及断裂韧度的影响。结果表明

合金元素Ti会占据Laves相TaCr

中Ta的位置。Cr、Ta和Ti元素混合粉末经球磨25h后仍未能合成金属间化合物

球磨后的混合粉末在1 350℃×1h热压烧结工艺下可获得高致密度合金。Cr-33.3Ta合金中添加20%的Ti会抑制C14结构的Laves相TaCr

生成。与Cr-33.3Ta合金相比

添加20%的Ti时具有良好的合金化增韧效果

其断裂韧度从2.013 MPa·m

1/2

提高至4.066 MPa·m

1/2

维氏硬度也有所提高

为11.59GPa。

Abstract

The Cr-33.3 Ta and Cr-26.6 Ta-20 Ti alloys were fabricated by mechanical alloying and hotpressing sintering process.The influences of Ti addition on the microstructure and fracture toughness of TaCr

alloys containing Laves phase were investigated.The results indicate that the alloying element Ti preferentially occupies the Ta site in the Laves phase TaCr2.Intermetallic compounds can’t be synthesized by the blended Ta

Cr and Ti powders during the ball-milling for 25 h.The highly dense alloys were prepared from the ball-milled blended powders by the hot-pressing process at 1 350 ℃for 1 hThe Cr-33.3 Ta alloy with an addition of 20%的 Ti（in atom）can inhibit the generation of Laves phase TaCr

with a C14 structure.Compared to the unalloyed Cr-33.3 Ta alloy

the fracture toughness value of the Cr-26.6 Ta-20 Ti alloy is increased from 2.013 MPa·m

1/2

to 4.066 MPa·m

1/2

exhibiting desirable alloying toughening effect.Meanwhile

the Vicker’s hardness is also increased up to 11.59 GPa.