scholarly journals Thermomechanical Processing of Cost-Affordable Powder Metallurgy Ti-5Fe Alloys from the Blended Elemental Approach: Microstructure, Tensile Deformation Behavior, and Failure

Metals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1405
Author(s):  
Carlos Romero ◽  
Fei Yang ◽  
Shanghai Wei ◽  
Leandro Bolzoni
Keyword(s):  
Powder Metallurgy ◽  
Tensile Deformation ◽  
Thermomechanical Processing ◽  
Low Cost ◽  
Solution Treatment ◽  
Sintered Alloy ◽  
Blended Elemental ◽  
Β Phase ◽  
Tensile Deformation Behavior ◽  
Interesting Approach

The development of cost-affordable Ti alloys is key for the application of Ti in other industries like the automobile sector. Therefore, a combination of powder metallurgy (PM) and low-cost compositions is an interesting approach. In this article, a cost-affordable PM Ti-5Fe alloy is processed following the blended elemental route and extruded at high temperature to remove porosity. Different extrusion temperatures and heat treatments (i.e., solution treatment and aging, STA) are performed to obtain ultrafine microstructures, and their effect on the mechanical behavior is studied. For extrusions in the β phase, microstructures consist of coarse lamellar colonies, resulting in alloys with improved properties compared to the as-sintered alloy but still lacking toughness due to the failure happening just after necking onset. Extruding in the α + β phase results in a bimodal microstructure of fine elongated primary α and coarse lamellar colonies, and the alloy becomes tougher. STA with aging below the eutectoid temperature of 590 °C leads to a hard but brittle alloy, whereas STA with aging above it results in alloys with strength comparable to the as-extruded conditions and enhanced ductility.

Microstructures and Properties of Ti-Nb Alloys Produced by Powder Metallurgy

2011 ◽  
Vol 80-81 ◽  
pp. 431-435 ◽  
Author(s):  
Zheng Cun Zhou ◽  
J. Du ◽  
H. Yang ◽  
S.Y. Gu ◽  
Y.J. Yan
Keyword(s):  
Powder Metallurgy ◽  
Testing Machine ◽  
Optical Microscope ◽  
Mechanical Analysis ◽  
Sintered Alloy ◽  
Xrd Diffraction ◽  
Β Phase ◽  
Ω Phase ◽  
Nb Content ◽  
And Storage

Ti-Nb alloys were prepared by powder metallurgy. Their microstructures are detected by the XRD diffraction and are observed using an optical microscope. The mechanical properties are tested using a dynamic mechanical analysis (DMA) Q800 from TA Instruments in single cantilever mode and using a 100 KN MTS testing machine with control software. It has been found that the sintered Ti-Nb alloys possess the stable α and β phases and the amount in β phase increases with increasing Nb content. The water quenched Ti-35.4Nb alloy contains α,,and βM. The as-sintered alloy has higher yield stress and storage modulus than the water quenched Ti-35.4Nb alloy, which is resulted from the α phase with high modulus in the as-sintered alloy. The ω phase can be precipitated from βMwhen the water quenched Ti-35.4Nb alloy is aged at 300 °C, causing the modulus to increase since ω phase has large modulus.

In-situ tensile deformation behavior of powder metallurgy Ti6Al4V alloys

2020 ◽  
Vol 91 ◽  
pp. 105266
Author(s):  
Boxin Lu ◽  
Fang Yang ◽  
Yanru Shao ◽  
Xinyue Zhang ◽  
Cunguang Chen ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Deformation Behavior ◽  
Tensile Deformation ◽  
Tensile Deformation Behavior

Tensile Deformation Behavior of M963 Cast Nickel-Base Superalloy

2004 ◽  
Vol 449-452 ◽  
pp. 549-552 ◽  
Author(s):  
Xiao Feng Sun ◽  
Feng Shi Yin ◽  
Heng Rong Guan ◽  
Zhuang Qi Hu
Keyword(s):  
Deformation Behavior ◽  
Tensile Deformation ◽  
Solution Treatment ◽  
Aging Treatment ◽  
Testing Temperature ◽  
Nickel Base Superalloy ◽  
Air Cooling ◽  
Tensile Deformation Behavior ◽  
Standard Solution ◽  
Nickel Base

The tensile deformation behavior of M963 superalloy treated by various heat treatments has been studied at both room and high temperature (1173K). The result shows that the alloy treated by the standard solution treatment at 1483K for 4h followed by air-cooling has low ductility especially at 1173K. The additional aging treatment at 1123K for 16h followed by furnace cooling can recover the ductility of the alloy at 1173K, but further decrease its room temperature ductility. The TEM observation shows that the deformation mechanism varied with both the testing temperature and heat treatment. Finally, the mechanism of the aging treatment on the deformation behavior of the M963 superalloy is discussed.

Microstructure and Shape Memory Behavior of Ti-18Nb-6Zr (at.%) Alloy

2021 ◽  
Vol 1016 ◽  
pp. 1368-1373
Author(s):  
Xiao Yun Song ◽  
Wen Jun Ye ◽  
Song Xiao Hui
Keyword(s):  
Shape Memory ◽  
Tensile Deformation ◽  
Solution Treatment ◽  
Tensile Tests ◽  
Martensite Phase ◽  
Air Cooling ◽  
X Ray Diffraction ◽  
Β Phase ◽  
Transmission Electron ◽  
Cold Rolled

The microstructures and shape memory behaviors of Ti-18Nb-6Zr (at.%) alloy subjected to different heat treatments were investigated through optical microscopy (OM), X-ray diffraction (XRD), Transmission electron microscopy (TEM) and tensile tests. Recrystallization occurs in cold-rolled Ti-18Nb-6Zr alloy after solution treatment at 600~800 °C. The cooling rate after solution treatment at 800°C shows a dramatic effect on the microstructure of the alloy. The microstructures for the water quenching (WQ) and oil quenching (OQ) specimens are composed of single α'' martensite phase, while for the air cooling (AC) specimen, the microstructure consists of predominant β phase and a small amount of fine athermal ω phase. During tensile deformation, two-stage yielding is observed in the alloy subjected to 800°C/0.5h/WQ heat treatment. The stress for martensite variants reorientation and the yield stress for plastic deformation are 310MPa and 455MPa, respectievely, and the maximum shape memory strain of 3.1% is obtained with pre-strain of 6%.

Microstructure and Tensile Properties of Boron-Doped Beta Titanium Alloy

2016 ◽  
Vol 849 ◽  
pp. 287-294 ◽  
Author(s):  
Rong Chen ◽  
Yang Yu ◽  
Song Xiao Hui ◽  
Wen Jun Ye
Keyword(s):  
Tensile Deformation ◽  
Boundary Migration ◽  
Solution Treatment ◽  
Grain Boundary Migration ◽  
Beta Titanium Alloy ◽  
Β Phase ◽  
Boron Doped ◽  
Beta Titanium ◽  
High Level ◽  
Strength And Ductility

The microstructural evolution and the mechanical properties of Ti-2Al-9.2Mo-2Fe-0.1B alloy during solution treatment and aging have been investigated. The experimental results showed that the addition of boron resulted in the formation of TiB phase and high level of recrystallization during hot deformation. TiB phase did not moved with the grain boundary migration during solution treatment. On aging, a little of α phase nucleated from the interface of TiB and β phase. The existence of TiB phase could offer the source of cracks during tensile deformation, resulting in the ductility decline of the alloy. In addition, the alloy which aged at 550°C and 600°C for 2h could obtain a good combination of strength and ductility, with 1100~1300MPa of ultimate strength and exceeding 7% of elongation.

Tensile Deformation Behavior of M963 Cast Nickel-Base Superalloy

2004 ◽  
Vol 449-452 ◽  
pp. 557-560
Author(s):  
Xiao Feng Sun ◽  
Feng Shi Yin ◽  
Heng Rong Guan ◽  
Zhuang Qi Hu
Keyword(s):  
Deformation Behavior ◽  
Tensile Deformation ◽  
Solution Treatment ◽  
Aging Treatment ◽  
Testing Temperature ◽  
Nickel Base Superalloy ◽  
Air Cooling ◽  
Tensile Deformation Behavior ◽  
Standard Solution ◽  
Nickel Base

The tensile deformation behavior of M963 superalloy treated by various heat treatments has been studied at both room and high temperature (1173K). The result shows that the alloy treated by the standard solution treatment at 1483K for 4h followed by air-cooling has low ductility especially at 1173K. The additional aging treatment at 1123K for 16h followed by furnace cooling can recover the ductility of the alloy at 1173K, but further decrease its room temperature ductility. The TEM observation shows that the deformation mechanism varied with both the testing temperature and heat treatment. Finally, the mechanism of the aging treatment on the deformation behavior of the M963 superalloy is discussed.

Behaviour of novel low-cost blended elemental Ti–5Fe-xAl alloys fabricated via powder metallurgy

2020 ◽  
Vol 110 ◽  
pp. 103865
Author(s):  
Y. Alshammari ◽  
B. Manogar ◽  
S. Raynova ◽  
F. Yang ◽  
L. Bolzoni
Keyword(s):  
Powder Metallurgy ◽  
Low Cost ◽  
Blended Elemental

Thermomechanical powder processing of beta-eutectoid bearing near-alpha Ti alloys

2019 ◽  
Vol 34 (01n03) ◽  
pp. 2040030
Author(s):  
Yousef Alshammari ◽  
Fei Yang ◽  
Leandro Bolzoni
Keyword(s):  
Powder Metallurgy ◽  
Powder Processing ◽  
Thermomechanical Processing ◽  
Low Cost ◽  
Hot Forging ◽  
Ti Alloys ◽  
Thermomechanical Deformation ◽  
Sintered Alloys ◽  
Selective Addition ◽  
Powder Metallurgy Route

This work focuses on developing near-alpha Ti alloys via the selective addition of small concentrations of low-cost eutectoid [Formula: see text]-stabilizers like Cu and Mn. In particular, these newly designed near-alpha Ti alloys are manufactured via the cheapest powder metallurgy route of cold pressing plus sintering. Moreover, thermomechanical deformation of the sintered alloys via hot forging in the [Formula: see text] and [Formula: see text] field was also investigated aiming to enhance the mechanical properties through reduction of the residual porosity and microstructural control. It is found that the initial addition of a small amount of eutectoid [Formula: see text]-stabilizers leads to higher tensile properties with comprision to pure Ti produced by powder metallurgy, and this is due to the formation of a coarse lamellar structure due to the presence of [Formula: see text]-stabilizers. Further enhancement of the strength is achieved by means of hot thermomechanical processing thanks to sealing of the residual pores, texturing, and refinement of the microstructural features.

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