Superplastic Deformation Behavior of As-Received and Hydrogenated Ti2AlNb Alloy

2018 ◽  
Vol 385 ◽  
pp. 109-113
Author(s):  
Xi Feng Li ◽  
Guo Peng Jia ◽  
Xu Dong Cao ◽  
Jun Chen ◽  
Guo Hong Wu
Keyword(s):  
Strain Rate ◽  
Superplastic Deformation ◽  
Initial Strain Rate ◽  
Tensile Tests ◽  
Strain Rate Range ◽  
Initial Strain ◽  
Uniaxial Tensile ◽  
Hydrogen Addition ◽  
Effects Of Temperature ◽  
Superplastic Properties

In this paper, the effects of temperature and initial strain rate on the superplasticity of as-received Ti2AlNb alloy were studied by uniaxial tensile tests. Temperature from 870°C to 1030°C with an interval of 40°C and initial strain rate range of 10-2s-1to 10-4s-1were selected. The optimal superplasticity of 190.3% was obtained at 990°C with initial strain rate of 10-3s-1. The superplastic properties were deteriorated at 1030°C due to serious grain coarsening. In order to improve superplastic properties, the as-received alloy was hydrogenated with different hydrogen contents. It was found that hydrogen addition can significantly decrease flow stress and increase elongation. A higher elongation occurs at 910°C in hydrogenated alloy.

Superplastic Behaviour of AA5083 Aluminium Alloy with Scandium and Zirconium

2012 ◽  
Vol 706-709 ◽  
pp. 395-401 ◽  
Author(s):  
A. Smolej ◽  
B. Skaza ◽  
B. Markoli ◽  
Damjan Klobčar ◽  
V. Dragojević ◽  
...  
Keyword(s):  
Cold Rolling ◽  
Strain Rate ◽  
Aluminium Alloy ◽  
Wide Temperature Range ◽  
Initial Strain Rate ◽  
Initial Strain ◽  
Strain Rates ◽  
Superplastic Behaviour ◽  
Hot And Cold Rolling ◽  
Superplastic Properties

The aim of the present investigation was to determine and to compare the superplastic behaviour of the AA5083 (Al-Mg-Mn) alloy with Sc and Zr additions. The investigated alloys were processed to form sheets by conventional hot and cold rolling. The superplastic properties were determined with strain rates in the range of 1x10-4to 5x10-2s-1and forming temperatures of 350 to 550°C. The results showed that the alloy with about 0.4% Sc exhibited a high superplastic ductility across a wide temperature range and strain rates up to 1x10-2s-1. The highest elongations to failure of about 2000% were attained at 550°C and at an initial strain rate of 5x10-3s-1. However, the alloy with about 0.15% Zr exhibited elongations up to 600%. The FSP processed Al-4.5Mg alloy with combined addition of about 0.2% Sc and 0.15% Zr exhibited good superplastic properties at higher strain rates (> 1x10-2s-1) with elongations up to 1500%.

Superplasticity and Microstructure Evolution of Electrodeposited Nanocrystalline Nickel

2007 ◽  
Vol 551-552 ◽  
pp. 539-544 ◽  
Author(s):  
S. Ding ◽  
Kai Feng Zhang ◽  
Guo Feng Wang
Keyword(s):  
Grain Size ◽  
Strain Rate ◽  
Room Temperature ◽  
Tensile Tests ◽  
Uniaxial Tensile ◽  
Intergranular Cracking ◽  
Mean Grain Size ◽  
Electrodeposited Nickel ◽  
Superplastic Properties

Nanocrystalline pure nickel (nc-Ni) was produced by pulse electrodeposition and its superplastic properties at and above room temperature were investigated. The electrodeposited nickel has a narrow grain size distribution with a mean grain size of 70nm. Uniaxial tensile tests at room temperature showed that nc-Ni has a limited plasticity but high tensile strength up to 1GPa at strain rates between 10-5 and 10-2s-1. However, when the temperature increased to 420 and higher, test specimens showed uniform deformation and the elongation value was larger than 200%. A maximum elongation value of 380% was observed at 450°C and a strain rate of 1.67x10-3s-1, SEM and TEM were used to examine the microstructures of the as-deposited and deformed specimens. The results indicated that fracture was caused by intergranular cracking and most cracks were originated from the brittle oxide formed during the tensile test. Grain coarsening was observed in the deformed specimen. The role of temperature and strain on grain growth was evaluated by comparing the microstructure of deformed samples with that of samples statically annealed. Deformation mechanism was discussed based upon the deformed microstructure and strain rate jump tests.

Deformation and Fracture Behavior of 7039 Al Reinforced with B4C Particles at Elevated Temperature

2007 ◽  
Vol 351 ◽  
pp. 65-69 ◽  
Author(s):  
Cun Zhu Nie ◽  
Jia Jun Gu ◽  
Jun Liang Liu ◽  
Di Zhang
Keyword(s):  
Elevated Temperature ◽  
Strain Rate ◽  
Fracture Behavior ◽  
Aluminum Matrix ◽  
Rate Sensitivity ◽  
Initial Strain Rate ◽  
Initial Strain ◽  
Temperature Deformation ◽  
Uniaxial Tensile ◽  
Deformation And Fracture

The elevated temperature deformation and fracture behavior of an 10vol%B4CP/7039 aluminum matrix composite plate was investigated by uniaxial tensile tests at temperatures ranging from573 to 773 K and at initial strain rates from 1x10-1 to 1x10-4s-1.The strain rate sensitivity exponent was found to be approximately 0.1-0.15 which was below that of a superplastic material. A maximum elongation of 116% was obtained at an initial strain rate of 10-1 s-1 and at a temperature of 773 K.

Effect of Rolling on Superplastic Behavior of an Al-Mg-Sc Alloy with Ultrafine-Grained Structure

2016 ◽  
Vol 838-839 ◽  
pp. 416-421 ◽  
Author(s):  
Andrii Dubyna ◽  
Sergey Malopheyev ◽  
Rustam Kaibyshev
Keyword(s):  
Cold Rolling ◽  
Strain Rate ◽  
Rolling Direction ◽  
Initial Strain Rate ◽  
Warm Rolling ◽  
Initial Strain ◽  
Superplastic Behavior ◽  
Ultrafine Grained ◽  
Elongation To Failure ◽  
Superplastic Properties

The superplastic behavior of a commercial aluminum alloy denoted as 1570 Al with a chemical composition of Al-6%Mg-0.5%Mn-0.2%Sc-0.07%Zr (in wt. %) and ultrafine-grained (UFG) structure produced by equal channel angular pressing at 300°C to a true strain ~12 was studied after final cold or warm rolling. The tensile specimens were machined along rolling direction and pulled up to failure in the temperature range of 250 to 500°C at strain rates ranging from 10-4 s-1 to 10-1 s-1. The specimens produced by warm or cold rolling exhibit different superplastic behavior. The material subjected to warm rolling exhibits excellent superplastic properties; the highest elongation-to-failure of ~1970% was recorded at a temperature of ~450°C and an initial strain rate of 1.4×10-1 s-1. On the other hand, the material subjected to cold rolling demonstrates moderate superplastic properties; the highest elongation-to-failure of ~755% appears at a temperature of ~300°C and an initial strain rate of 1.4×10-2 s-1.

Superplasticity of an AA2519 Aluminum Alloy

2016 ◽  
Vol 838-839 ◽  
pp. 278-284
Author(s):  
Ivan Zuiko ◽  
Marat Gazizov ◽  
Rustam Kaibyshev
Keyword(s):  
Strain Rate ◽  
Thermomechanical Processing ◽  
Rate Sensitivity ◽  
Initial Strain Rate ◽  
Tensile Tests ◽  
Sensitivity Coefficient ◽  
Initial Strain ◽  
Strain Rates ◽  
Average Grain Size ◽  
Elongation To Failure

A commercial AA2519 alloy with a chemical composition of Al-5.64Cu-0.33Mn-0.23Mg-0.15Zr (in wt. %) was subjected to two-step thermomechanical processing (TMP) providing the formation of fully recrystallized structure with an average grain size of ~7 mm in 3 mm thin sheets. Superplastic tensile tests were performed in the temperature interval 450-535°C and initial strain rates ranging from ~2.8 x 10-4 to ~6.0 x 10-1 s-1. The highest elongation-to-failure of ~750% appears at a temperature of ~525°C and an initial strain rate of ~1.4 × 10-4 s-1 with the corresponding strain rate sensitivity coefficient of ~0.46.

Superplasticity in CP-Titanium Alloys

2007 ◽  
Vol 551-552 ◽  
pp. 373-378 ◽  
Author(s):  
X.J. Zhu ◽  
Ming Jen Tan ◽  
K.M. Liew
Keyword(s):  
High Temperature ◽  
Grain Growth ◽  
Initial Strain Rate ◽  
Tensile Tests ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Uniaxial Tensile ◽  
Step Method ◽  
Commercially Pure ◽  
Effects Of Temperature

In this work, studies were carried out to investigate the superplasticity of a commercially pure (CP) titanium alloy during high temperature deformation. Uniaxial tensile tests were carried out at 600, 750 and 800°C with an initial strain rate from 10-1s-1 to 10-4s-1. It was found that the alloy do not show good superplasticity due fast grain growth at high temperature and cavity. The effects of temperature on the grain growth and cavity phenomena as well as the dynamic recrystallization of the alloy were studied and a ‘two-step-method’ was introduced to increase the superplasticity of the alloy.

Research on Superplasticity of Supplied 5A06 Aluminium Alloy Sheet

2016 ◽  
Vol 838-839 ◽  
pp. 127-131
Author(s):  
Bao Peng Bi ◽  
Yong Wang
Keyword(s):  
Aluminum Alloy ◽  
Strain Rate ◽  
Elevated Temperatures ◽  
Tensile Tests ◽  
Grain Boundary Sliding ◽  
Strain Rate Range ◽  
Alloy Sheet ◽  
Uniaxial Tensile ◽  
5A06 Aluminum Alloy ◽  
Bulging Test

Superplasticity of supplied 5A06 aluminum alloy is reviewed in this paper. Supplied 5A06 aluminum alloy is researched on superplasticity by the methods of same strain rate high temperature uniaxial tensile tests at temperature range375°C-500°Cand strain rate range 2.5×10-4s-1~1.0×10-2s-1. Microstructure and fracture of tensile samples are analyzed and discussed, deduce that grain boundary sliding (GBS) is the predominant deformation mechanism. Superplastic formability of the alloy is evaluated by gas bulging test at elevated temperatures. Gas bulging test demonstrates the deformation process parameters for the best superplastic formability is 400°Cand 0.005s-1 ,suggesting good application prospect for this aluminum alloy.

Research on the Superplastic Forming of Copper Alloy Solid-Bearing Cages Used in Railway Vehicles

2007 ◽  
Vol 551-552 ◽  
pp. 73-77 ◽  
Author(s):  
Yong Shun Yang ◽  
Guo Qing Chen ◽  
F.X. Chen
Keyword(s):  
Strain Rate ◽  
Copper Alloy ◽  
Production Efficiency ◽  
Superplastic Forming ◽  
Initial Strain Rate ◽  
Initial Strain ◽  
Uniaxial Tensile ◽  
Manufacturing Cost ◽  
Aluminum Bronze ◽  
Railway Vehicles

In this paper uniaxial tensile tests were carried out at temperature range of 650~810°C and initial strain rate range of 10-4~10-1s-1 to evaluate the superplasticity of as-casting aluminum-bronze QAl10-3-1.5 alloy. The superplastic forming technology (SPF) was adopted to produce solid-bearing cages made of aluminum-bronze QAl10-3-1.5 alloy. The results demonstrate that as-casting QAl10-3-1.5 copper alloy shows good superplasticity without prior-treatment. The maximum elongation of 545% is obtained at 790°C and initial strain rate of 1.0×10-2 s-1, while the maximum flow stress is only 12.4MPa. By using superplastic extrusion technology solid-bearing cages used in railway vehicles were obtained. As-extruded cages have good surface quality and the dimensional accuracy satisfies the design standards. Using this technology the production efficiency is greatly enhanced and the manufacturing cost is reduced, especially the expensive copper alloys are saved.

The Effect of Grain Size on Superplastic Deformation of Ti-6Al-4V Alloy

2007 ◽  
Vol 551-552 ◽  
pp. 387-392 ◽  
Author(s):  
Wen Juan Zhao ◽  
Hua Ding ◽  
D. Song ◽  
F.R. Cao ◽  
Hong Liang Hou
Keyword(s):  
Grain Size ◽  
Grain Growth ◽  
Superplastic Deformation ◽  
Initial Strain Rate ◽  
Deformation Mode ◽  
Tensile Tests ◽  
Optical Microscope ◽  
Coarse Grained ◽  
Transmission Electron ◽  
Grain Growth Model

In this study, superplastic tensile tests were carried out for Ti-6Al-4V alloy using different initial grain sizes (2.6 μm, 6.5μm and 16.2 μm) at a temperature of 920°C with an initial strain rate of 1×10-3 s-1. To get an insight into the effect of grain size on the superplastic deformation mechanisms, the microstructures of deformed alloy were investigated by using an optical microscope and transmission electron microscope (TEM). The results indicate that there is dramatic difference in the superplastic deformation mode of fine and coarse grained Ti-6Al-4V alloy. Meanwhile, grain growth induced by superplastic deformation has also been clearly observed during deformation process, and the grain growth model including the static and strain induced part during superplastic deformation was utilized to analyze the data of Ti-6Al-4V alloy.

scholarly journals SUPERPLASTIC DEFORMATION OF TWO PHASE MgLiAl ALLOYAFTER TCAP PRESSING.

2017 ◽  
Vol 23 (3) ◽  
pp. 215 ◽  
Author(s):  
Jan Marek Dutkiewicz ◽  
Stanislav Rusz ◽  
Dariusz Kuc ◽  
Ondrej Hilser ◽  
Paweł Pałka ◽  
...  
Keyword(s):  
Strain Rate ◽  
Rate Sensitivity ◽  
Superplastic Forming ◽  
Sensitivity Coefficient ◽  
Strain Rate Range ◽  
Two Phase ◽  
Angular Pressing ◽  
Slip Planes ◽  
Superplastic Properties ◽  
Grain Misorientation

<p>Magnesium based alloy containing 9 wt. % Li, 1,5 wt. % Al, composed of a + b (hcp + bcc) phases was cast under argon atmosphere and extruded at 350<sup>o</sup>C. Up to 3 passes of Twist Channel Angular Pressing TCAP deformation was applied at 160<sup>o</sup>C. TCAP tool consisted of helical part in horizontal area of the channel with angle of lead γ = 30° to simulate back pressure. The initial grain size of hexagonal a phase estimated at 30 mm decreased in following passes down to 6 mm and that of bcc b phase decreased after TCAP from initial 12 mm down to 5 mm. TEM studies after TCAP passes showed higher dislocation density in the b region than in the a phase. Crystallographic relationship (001) a || (110) b indicated parallel positioning of slip planes of both phases. Electron diffraction confirmed increase of grain misorientation with number of TCAP passes. Stress/strain curves measured at temperature 200<sup>o</sup>C showed superplastic forming after 1<sup>st</sup> and 3<sup>rd</sup> TCAP pass. Values of strain rate sensitivity coefficient <em>m</em> were calculated at 0.31 after 1 TCAP pass and increased after 3<sup>rd</sup> TCAP pass up to 0.47 for the strain rate range 10<sup>-5</sup> – 5 10<sup>-4</sup>. Increase of number of TCAP passes had positive effect on superplastic properties due to finer grains and increase of their misorientation;</p>

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