Comparative assessment of microstructure and compressive behaviours of PM TiAl alloy prepared by HIP and pseudo‐HIP technology

Zhang, W; Liu, Y; Liu, B; Huang, Baiyun

doi:10.1179/174329009x424528

Cited by 10 publications

(5 citation statements)

References 20 publications

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“…Table 3 shows the hardness variation of TiAl matrix composites with different carbon contents. It can be seen from Table 3 that the hardness of composites was enhanced with the low addition of C. Zhang et al [76] found that the hardness of the Ti-47Al-4Nb-2Cr-(0-0.8)C alloy increased by 38.9%, from 2.85 GPa to 3.96 GPa, with the increased carbon content.…”

Section: Hardnessmentioning

confidence: 98%

Microstructure and Mechanical Properties of TiAl Matrix Composites Reinforced by Carbides

Yang

Liang

et al. 2022

Metals

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TiAl alloys have the potential to become a new generation of high-temperature materials due to their lightweight and high-strength properties, while the brittleness at room temperature and microstructure stability at elevated temperature are the key problems. The preparation of composite materials is an effective way to solve these problems, because the mechanical properties of TiAl matrix composites can be improved by the close combination of the reinforced phase and matrix. The preparation methods, microstructure, and mechanical properties of TiAl matrix composites reinforced by carbides are reviewed from the literature in this paper. A comprehensive summary of the effect of C on TiAl alloys can reveal the relationship between the microstructure and mechanical properties and provide guidance for subsequent experimental works. Two forms of C in TiAl matrix composites are reviewed: solid solutions in matrix and carbide precipitations. For TiAl alloys, the minimum carbon content for the carbide precipitation is about 0.5 at.% for low-Nb-containing TiAl alloys and about 0.8 at.% for high-Nb-TiAl alloys. An appropriate amount of C can improve the tensile properties and flexural strength of TiAl alloys. The hardness of the composites is higher than that of pure TiAl due to solution strengthening when the carbon content is low. The minimum creep rate of TiAl alloys can be reduced by one order of magnitude by adding C at the amount near the solubility limit.

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Section: Hardnessmentioning

confidence: 98%

Microstructure and Mechanical Properties of TiAl Matrix Composites Reinforced by Carbides

Yang

Liang

et al. 2022

Metals

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“…The lamellar structure began to appear in local regions as the HIP temperature increased to 1150 • C, as shown in Figure 11c. In the lamellar structure, the lamellar α 2 phase reduces the interstitial atom concentration in γ phase, resulting in the weakened ability of P-N stress pinning dislocations, and the enhanced deformation ability of γ phase, reducing the hardness of the microstructure, so the hardness decreases after the lamellar structure appears [42]. With an increase in the HIP temperature, the densification increases, which is helpful for increasing hardness.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…In addition, the tensile strength of the 4# HIP billet was 444.7 MPa, which was higher than that of as-cast (385.9 MPa). This was mainly because of the poor mechanical properties of the cast alloy due to its coarse structure and severe constitution segregation [42]. Meanwhile, with the increase in the HIP temperature, the compressive strength and bending strength decreased gradually, and the compressive strain first decreased and then increased.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Evolution Behavior of Rapidly Solidified Microstructure of a Ti-48Al-3Nb-1.5Ta Alloy Powder during Hot Isostatic Pressing

Zuo

et al. 2023

Metals

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In this study, Ti-48Al-3Nb-1.5Ta powders were manufactured from cast bars by the supreme-speed plasma rotating electrode process (SS-PREP) and used to prepare hot isostatically pressed (HIPed) material at 1050–1260 °C with 150 MPa for 4 h. The phase, microstructure and mechanical performance were analyzed by XRD, SEM, electrical universal material testing machine and other methods. The results revealed that the phase constitution changed from γ phase to α2 phase and then to γ phase with the material changing from as-cast to powders and then to as-HIPed. Compared with the as-cast material, the grain size and element segregation were significantly reduced for both powders and as-HIPed. When the hot isostatic pressing (HIP) temperature was low, the genetic characteristics of the powder microstructure were evident. With the HIP temperature increasing, the homogeneity of the composition and microstructure increased, and the prior particle boundaries (PPBs) gradually disappeared. The elastic moduli of powder and as-HIPed were superior to those of as-cast, which increased with the HIP temperature increasing. The hardness of as-HIPed was lower than that of the powder. The compressive strength, compressive strain, bending strength, and tensile strength of as-HIPed were higher than those of as-cast. With an increase in the HIP temperature, the compressive strength decreased gradually, and the compressive strain first decreased and then increased.

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“…Oxygen contamination in uences the mechanical properties of titanium alloys. Small increase in oxygen content in HIP prepared samples can lead to a signi cant decrease in elongation 21) . Therefore, to ensure that the titanium alloys have better mechanical properties, the oxygen increment should be strictly controlled during powder preparation.…”

Section: The Relationship Between Rotating Speed and Particle Size Cmentioning

confidence: 99%

Microstructure and Properties of High Temperature Titanium Alloys with a High Si Content Prepared by Powder Metallurgy

Kuang

Zou²,

Cai³

et al. 2017

Mater. Trans.

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The objective of this paper is to improve the performance of high temperature titanium alloys with a high Si content by powder metallurgy. Firstly Ti-6.5Al-1.4Si-2Zr-0.5Mo-2Sn alloy powders were prepared using two different rotating speeds by plasma rotating electrode process (PREP). Then two sintering temperatures were selected to fabricate titanium alloys by hot isostatic pressing (HIP). The relationship between rotating speed and particle size distribution was investigated. X-ray diffraction, SEM, and OM were used to characterize the phase compositions, morphologies, and microstructures of the powders and titanium alloys. The mechanical properties of titanium alloys were investigated at room temperature,300 C and 600 C. The results show that high quality titanium alloy powders were prepared by PREP. The mechanical properties of titanium alloy fabricated by powder metallurgy were superior compared to casting.And the strength is higher than typical Ti-1100 high temperature alloy. [

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Comparative assessment of microstructure and compressive behaviours of PM TiAl alloy prepared by HIP and pseudo‐HIP technology

Cited by 10 publications

References 20 publications

Microstructure and Mechanical Properties of TiAl Matrix Composites Reinforced by Carbides

Microstructure and Mechanical Properties of TiAl Matrix Composites Reinforced by Carbides

Evolution Behavior of Rapidly Solidified Microstructure of a Ti-48Al-3Nb-1.5Ta Alloy Powder during Hot Isostatic Pressing

Microstructure and Properties of High Temperature Titanium Alloys with a High Si Content Prepared by Powder Metallurgy

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