The Microstructure Evolution, Mechanical Properties and Densification Mechanism of TiAl-Based Alloys Prepared by Spark Plasma Sintering

Wang, Dongjun; Yuan, Hao; Qiang, JianMing

doi:10.3390/met7060201

Cited by 20 publications

(10 citation statements)

References 30 publications

(33 reference statements)

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“…Currently, an active area of research regards titanium aluminides, where the difficulties of these low-ductility materials are offset by their potential for weight saving and higher-temperature operation. The interesting work by Wang et al [7] relating microstructure and mechanical properties is a welcome addition to this compilation.…”

Section: Contributionsmentioning

confidence: 91%

Titanium Alloys 2017

Whittaker

2018

Metals

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Section: Contributionsmentioning

confidence: 91%

Titanium Alloys 2017

Whittaker

2018

Metals

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“…For example, the density and Vickers hardness simultaneously increase when the sintering temperature of the SP and MP powders are increased from 1200 • C to 1300 • C and from 1100 • C to 1250 • C, respectively. After the densification is essentially complete, the resulting Vickers hardness of the sintered specimen is directly related to its internal structure [28]. Figure 5 shows that the microstructure of the SP powder sintered specimen is predominantly a grain phase structure when the sintering temperature reaches 1300 • C. At this point, the corresponding Vickers hardness is 290 HV.…”

Section: Effect Of Sintering Temperature On Density and Vickers Hardnmentioning

confidence: 99%

Effects of Powder Preparation and Sintering Temperature on Properties of Spark Plasma Sintered Ti-48Al-2Cr-8Nb Alloy

Wang

Sun

et al. 2019

Metals

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TiAl alloy has become a key element in aerospace and automotive engine development due to its favorable high temperature mechanical properties and low density. In this paper, high performance TiAl alloy was prepared using atomized Ti-48Al-2Cr-8Nb powder by spark plasma sintering. This paper analyzed the variation of density, microstructure, Vickers hardness, and fracture strength of TiAl alloys prepared with spherical pre-alloyed powder (named as SP powder) and pre-alloyed powder after 12 h of ball milling (named as MP powder) at different sintering temperatures. The results indicate that the density, Vickers hardness, and room temperature (25 °C) bending strength of Ti-48Al-2Cr-8Nb alloy sintered using MP powder, are significantly higher than that of TiAl alloy sintered using SP powder. Specifically, the densification temperature of the MP powder sintered specimen is reduced by 100 °C, the Vickers hardness is increased by 15%, and the room temperature bending strength is increased by 51.9% at a sintering temperature of 1250 °C. The microstructure analysis shows that the Ti-48Al-2Cr-8Nb alloy has the best bending strength when it has a fine grain phase structure.

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“…The two methods are widely used by researchers, SPS technique is a promising technique due to aforementioned reasons [12]. Ti6Al4V master alloy and TiAl intermetallics are among advanced materials that are widely used in high added value industries and thus most investigated by the economic SPS technique [13][14][15][16][17][18][19][20] while only few investigations are focused on SPS of CP-Ti.…”

Section: Introductionmentioning

confidence: 99%

“…Garbiec, et al [16] further suggest that increased compaction pressure assisted in densification during heating by more rapid formation of necks favoring Joule effect which in turn enhanced diffusion and thereafter grain growth resulted. [19] report plastic deformation as densification mechanism in TiAl intermetallics prepared by SPS, the authors related the effect of pressure on density. At sintering temperature of 1150°C, by increasing pressure from 10 MPa to 50 MPa, the density gradually increased from 3.947 g/cm 3 to 3.967 g/cm 3 .…”

Section: Introductionmentioning

confidence: 99%

Microstructural evolution and mechanical properties of pure titanium powders processed by spark plasma sintering

et al. 2019

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In this study the effect of sintering pressure on the densification, microstructure and mechanical properties of commercial pure titanium (CP-Ti) powders with varying chemistry was investigated. The sintering was performed at a constant dwell time of 3 min at varying temperature and pressure in the range of 550-900°C and 25-75 MPa in vacuum, respectively. Full densification with high Vickers hardness values of 340 HV and 262 HV was obtained at 25 MPa at 800°C and 900°C respectively for two commercial powders with different average particles sizes. Different microstructural transformations with respect to increasing temperature and pressure were observed on the sintered pellets. The results were discussed emphasizing the huge role of the interstitial elements, contained in the starting powders, on the properties (relative density, Vickers hardness and microstructure) of the dense samples. This paper shows that good mechanical properties can be obtained by SPS technique when CP-Ti powders are sintered at very low temperature during a short period in contrast to conventional fabrication techniques.

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The Microstructure Evolution, Mechanical Properties and Densification Mechanism of TiAl-Based Alloys Prepared by Spark Plasma Sintering

Cited by 20 publications

References 30 publications

Titanium Alloys 2017

Titanium Alloys 2017

Effects of Powder Preparation and Sintering Temperature on Properties of Spark Plasma Sintered Ti-48Al-2Cr-8Nb Alloy

Microstructural evolution and mechanical properties of pure titanium powders processed by spark plasma sintering

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