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Enhancing Microstructural Characteristics and Mechanical Properties of Ti-Al-Dy Alloy through Ball Milling and SPS Consolidation

Hyunseung Lee Si Young Chang
Archives of Metallurgy and Materials | 2024 | vol. 69 | No 2 | 475-478 | DOI: 10.24425/amm.2024.149770
Keywords High energy ball milling SPS Ti-Al-Dy High temperature hardness Microstructure
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Abstract

In this study, pure Ti, Al, Dy powders were ball-milled with zirconia balls in argon atmosphere for 3 h at 800 rpm, producing a Ti- 6 wt.% Al- 4 wt.% Dy alloy powder. The alloy powder was consolidated by SPS technique at 1373 K for 15 min under 50 MPa pressure in vacuum. The sintered body had approximately 99% in density and 6 μm in grain size. XRD and TEM revealed the presence of the second phases such as Ti3Al, Al3Dy and Ti4Al20Dy phases, and their sizes were approximately 50 nm. Microhardness was approximately 960 Hv at room temperature, which decreased as temperature increased. However, there remained the micro-hardness significantly higher compared to the commercial Ti-6Al-4V alloy. After hardness test at 1173 K, XRD analysis did not show any difference in peaks, while the grain size and second phases size increased by ~4 μm and ~2 nm, respectively.
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Authors and Affiliations

Hyunseung Lee
1
ORCID: ORCID
Si Young Chang
1
ORCID: ORCID
  1. Korea Aerospace University, Department of Materials Science and Engineering, Goyang, Korea

Microstructural Characteristics of Ti-Al-Dy Alloy Produced by High Energy Ball Milling

Yuri Kim Hoseong Rhee Si Young Chang
Archives of Metallurgy and Materials | 2021 | vol. 66 | No 3 | 789-793 | DOI: 10.24425/amm.2021.136381
Keywords high energy ball milling Ti-Al-Dy powders SPS microstructure Micro-hardness
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Abstract

In this study, the alloying of Ti, Al and Dy powders by high energy ball milling, and the spark plasma sintering (SPS) characteristics of as milled powders have been investigated based on the observation of microstructure. Pure Ti, 6wt% Al and 4wt% Dy powders were mixed and milled with zirconia balls at 600 ~ 1000 rpm for 3h in an Ar gas. The initial sizes of Ti, Al and Dy powders were approximately 20, 40, and 200 μm, respectively. With increasing the milling speed from 600 to 1000 rpm, the size of mixing powders reduced from 120 to 15 μm. On the other hand, from XRD results of powders milled at higher speeds than 700rpm, the peaks of Ti3Al and AlDy phases were identified, indicating the successful alloying. Therefore, the powders milled at 800 rpm have been employed for the SPS under the applied pressure of 50 MPa at 1373K for 15 min. In the SPSed sample, the Al3Dy and two ternary Ti-Al-Dy phases were newly detected, while the peak of AlDy phase disappeared. The SPSed Ti-6Al-4Dy alloy revealed high relative density and micro-hardness of approximately 99% and 950Hv, respectively.
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Authors and Affiliations

Yuri Kim
1
Hoseong Rhee
1
ORCID: ORCID
Si Young Chang
1
ORCID: ORCID
  1. Korea Aerospace University, Department of Materials Science and Engineering, Goyang 10540, Korea

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