Effect of Pre-Straining Method on Mechanical Properties of Thermo-Mechanically Processed Al-Cu-Mg Alloy

2018 ◽  
Vol 385 ◽  
pp. 364-369 ◽  
Author(s):  
Ivan Zuiko ◽  
Vladislav Kulitckii ◽  
Rustam Kaibyshev
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Yield Stress ◽  
Homogeneous Distribution ◽  
Precipitation Behavior ◽  
Nucleation Sites ◽  
Elongation To Failure ◽  
Phase Plates ◽  
Distribution Of Dislocations

The present study deals with the effect of pre-deformation technique of AA2519 alloy (Al–5.64Cu–0.33Mn–0.23Mg–0.15Zr–0.11Ti–0.09V–0.08Fe–0.01Si (wt. %)) under T8 tempers, on condition that intermediate strains are equal. After undergoing T87 by pre-stretching and peak ageing the alloy demonstrates the yield stress, ultimate tensile strength and elongation to failure of 425.4±2.4 MPa, 475±2.4 MPa, 12.1±0.4%, respectively. The 7% pre-straining by rolling leads to-5% decrease in yield stress, practically the same ultimate tensile strength and-20% decrease in ductility. This effect can be ascribed to more homogeneous distribution of dislocations which act as heterogeneous nucleation sites for the θ′-phase precipitation. In addition to precipitates of the Al–Cu family (θ′′ and θ′), Ω-phase plates on {111}α habit plane was observed. The effect of pre-straining prior to ageing on the precipitation behavior and its relation with mechanical properties of the AA2519 is considered.

scholarly journals Kearns texture parameters, mechanical properties and damageability of titanium sheet after alternating bending

2021 ◽  
Vol 22 (3) ◽  
pp. 543-550
Author(s):  
V.V. Usov ◽  
N.M. Shkatulyak ◽  
O.S. Savchuk ◽  
N.I. Rybak
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Elastic Modulus ◽  
Ultimate Tensile Strength ◽  
Yield Stress ◽  
Rolling Direction ◽  
Initial State ◽  
Texture Parameters ◽  
Experimental Values ◽  
Alternating Bending

This work aims to determine the Kearns texture parameters and evaluate on their basis the elastic moduli, mechanical properties (ultimate tensile strength, conditional yield stress), as well as damageability parameters of the sheets commercial titanium (CT-grade 1: 0.04% Fe; 0.015% C; 0.05% N 0.05% c; 0.009% H)  as delivered after rolling and annealing at 840°C (original sheet) and further alternating bending (AB) in the amount of 0.5; 1, 3 and 5 cycles. Damageability parameters characterizing damage accumulation were determined from the elastic modulus change after the above-mentioned number of AB cycles relative to the values ​​of the elastic modulus in different directions of the original sheet of the studied titanium. The elastic constants of the single crystal and the Kearns texture parameters were used to estimate the elastic modulus in the rolling direction (RD) and transverse direction (TD) of the original sheet, and sheets after an above number of AB cycles. The deviation of the calculated and experimental values ​​of the elastic modulus did not exceed 5%. The deviation of the calculated and experimental values of the ultimate tensile strength and yield stress in the RD and TD both in the initial state and after the corresponding number cycles of the AB did not exceed 10%.

Effects of Gd on the Microstructure and Mechanical Properties of Mg-3Sn Alloys

2013 ◽  
Vol 747-748 ◽  
pp. 245-250 ◽  
Author(s):  
Jun Luo ◽  
Rong Shi Chen ◽  
En Hou Han
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Volume Fraction ◽  
Microstructure And Mechanical Properties ◽  
Elongation To Failure ◽  
New Phase

The microstructure and mechanical properties of as-cast Mg-3Sn-xGd (x=0, 0.2, 1 wt.%) alloys were studied by using OM, SEM, EDX, XRD etc. With the increase of Gd, the formation of Mg2Sn phase was impeded and the MgSnGd phase formed and the volume fraction of this new phase obviously increased. The ultimate tensile strength and elongation to failure increased with dilute Gd addition but sharply decreased when the Gd addition comes to 1.34 wt.%. The possible reasons for the variation in microstructure and mechanical properties were discussed.

Reinforcing Inconel 718 Superalloy by Nano-TiC Particles in Selective Laser Melting

2015 ◽  
Author(s):  
Yachao Wang ◽  
Jing Shi ◽  
Yun Wang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Additive Manufacturing ◽  
Ultimate Tensile Strength ◽  
Yield Stress ◽  
Selective Laser Melting ◽  
Inconel 718 ◽  
Reinforcement Particle ◽  
Manufacturing Processes ◽  
Laser Melting

Metal components produced by additive manufacturing processes usually have inferior properties and performances as compared with the counterparts by the traditional forming and machining processes. To close the gap, the metal matrix can be strengthened by adding reinforcement particles in additive manufacturing processes. This research presents the fabrication of nano-TiC reinforced Inconel 718 composites using selective laser melting (SLM). Tensile and wear performance tests are conducted to evaluate the mechanical properties of the formed composites. It is discovered that the composites exhibit improved mechanical properties in terms of ultimate tensile strength and yield stress. Compared with the pure Inconel 718 specimens by SLM, the ultimate tensile strength and yield stress of the reinforced Inconel 718 increase by 207 MPa and 204 MPa, respectively, with 0.5 wt.% addition of nano-TiC particle. Smaller increases are observed with 0.25 wt.% and 1.0 wt.% nano-TiC additions. On the other hand, the addition of nano-TiC particles decreases the ductility of Inconel 718. To investigate the strengthening mechanism of nano reinforcement particles in SLM, the microstructures with different levels of nano-TiC particles are observed. The results indicate that the microstructure of Inconel 718 is remarkably refined by the TiC particles, and the reinforcement particle significantly impede the growth of columnar grain in the solidification process.

Effect of TiC Addition and Cooling Rate on Mechanical Properties of 316L Stainless Steel Composites

2011 ◽  
Vol 311-313 ◽  
pp. 84-87
Author(s):  
Shao Jiang Lin ◽  
Sai Yu Wang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Stainless Steel ◽  
Ultimate Tensile Strength ◽  
Cooling Rate ◽  
316L Stainless Steel ◽  
Research Work ◽  
Elongation To Failure ◽  
Tic Particle ◽  
Particle Addition

The present research work concerns the development of TiC reinforced 316L stainless steel composites through powder metallurgical technology and sintered in vacuum. The effect of TiC particle addition and cooling rate on the mechanical properties of 316L stainless steel composites has been investigated. The results show that increasing the cooling rate caused enhancement of ultimate tensile strength and microhardness. However, the elongation to failure of the composites was decreased with the increase of cooling rate. The addition of TiC particle was found to improve the ultimate tensile strength of 316L stainless steel composites. The highest tensile strength was 648 MPa in specimens containing 5wt.% TiC. Further increase in TiC content to 10wt% results in a reduction in tensile strength to 631 MPa.

Effect of Extrusion Time on Microstructure and Mechanical Properties of AZ31B Magnesium Alloy Prepared by Solid-State Recycling

2011 ◽  
Vol 391-392 ◽  
pp. 559-563
Author(s):  
Shu Yan Wu ◽  
Ze Sheng Ji ◽  
Li Hua Wen ◽  
Hong Bo Li
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Solid State ◽  
Magnesium Alloy ◽  
Ultimate Tensile Strength ◽  
Dynamic Recrystallization ◽  
Stream Line ◽  
Alloy Matrix ◽  
State Process ◽  
Elongation To Failure

AZ31B magnesium alloys recycled by solid-state process from oxidized chip were extruded repeately. Microstructures and mechanical properties of recycled alloys for different extrusion times were studied. With the increasing extrusion times, the breaking degree and homogeneity of oxide increase and stream line feature of oxide become less obvious. Second extrusion make dynamic recrystallization microstructure of recycled alloy become more homogeneous and fine, but the microstructure is not refined furtherly after 3 and 4 times extrusion. The ultimate tensile strength increases with the increasing extrusion time, which resulting from the microstructure evolution during repeating extrusion and the enhanced bonding between oxide and magnesium alloy matrix. The elongation to failure of recycled alloy increases after second extrusion and continuously decreases after 3 and 4 time extrusion. This is determined not only by the variation of dynamic recrystallization microstructure and bonding strength between chips but also by the distribution status of oxide.

Effect of the Cyclic Extrusion and Compression Processing on Microstructure and Mechanical Properties of Al-1%Cu Alloy

2018 ◽  
Vol 780 ◽  
pp. 93-97
Author(s):  
Walaa Abdelaziem ◽  
Atef Hamada ◽  
Mohsen Abdel-Naeim Hassan
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Cast Alloy ◽  
Surface Hardness ◽  
Grain Structure ◽  
Cu Alloy ◽  
Cu Alloys ◽  
Microstructure And Mechanical Properties ◽  
Elongation To Failure

The Simple Cyclic extrusion compression (SCEC) has been developed for producing Al-1%Cu alloys with fine microstructures and superior properties. SCEC method was applied for only two-passess.It was found that the grain structure was significantly reduced from 1500 μm to 100 μm after two passes of cyclic extrusion. The ultimate tensile strength and elongation to failure of as-cast alloy were 110 MPa and 12 %, respectively. However, the corresponding mechanical properties of the two pass CEC deformed alloy are 275 MPa and 35%, respectively. These findings ensure that a significant improvement in the grain structure has been achieved. In addition, cyclic extrusion deformation increased the surface hardness of the alloy by 50 % after two passes.

scholarly journals Effect of Rolling Temperature and Subsequence Ageing on the Mechanical Properties and Microstructure Evolution of an Al-Cu-Li Alloy

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 853
Author(s):  
Lin Wang ◽  
Charlie Kong ◽  
Puneet Tandon ◽  
Alexander Pesin ◽  
Denis Pustovoytov ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Dislocation Density ◽  
Microstructure Evolution ◽  
Hot Rolling ◽  
Alloy Sheet ◽  
Low Dislocation Density ◽  
Nucleation Sites ◽  
Density Zone

The mechanical properties and microstructure evolution of an Al-Cu-Li alloy sheet processed via hot rolling (HR) (at 400 °C and 500 °C) or cryorolling (CR) (at −100 °C and −190 °C) and subsequence aging at 160 °C for 10 h were investigated. Before aging, the highest ultimate tensile strength of 502 MPa was achieved when the sheets were cryorolled at −190 °C, while the better ultimate tensile strength of 476 MPa and the best elongation rate of 11.1% was achieved simultaneously when the sheets were cryorolled at −100 °C. The refined grains and numerous uniform deformation-induced dislocations microstructures were responsible for the improved strength and enhanced ductility of the cryorolled sheets compared to that of the alloy processed by hot rolling with a low dislocation density zone (LDDZ) and high dislocation density zone (HDDZ). After aging at 160 °C for 10 h, the ultimate tensile strength further improved resulted from the greater precipitation strengthening, and the increased precipitates provided greater resistance to dislocations movement resulting in the increased ductility although the dislocation density decreased. The uniform dislocation microstructures in the cryorolled sheets provide numerous nucleation sites for the precipitates, leading to higher strength after aging.

Effect of the Thermomechanical Processing on Microstructure and Properties of an Al-Ce Alloy

2012 ◽  
Vol 706-709 ◽  
pp. 361-366 ◽  
Author(s):  
Anna Mogucheva ◽  
Dmitriy Zyabkin ◽  
Rustam Kaibyshev
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Electric Conductivity ◽  
Yield Stress ◽  
Room Temperature ◽  
Thermomechanical Processing ◽  
Fold Increase ◽  
Angular Pressing ◽  
Eutectic Particles

Effect of equal channel angular pressing (ECAP) at room temperature and subsequent annealing at temperatures ranging from 450 to 600°C on microstructure, mechanical properties and electric conductivity of an Al-8%Ce alloy was examined It was shown that Al4Ce-type eutectic particles having plate-like shape break under ECAP; distribution of the particles appears to be more homogeneous. ECAP leads to about two-fold increase in yield stress (YS) and ultimate tensile strength (UTS); ductility and electric conductivity decrease significantly. Under following annealing, the spheroidizing and coagulation of Al4Ce-type particles occur extensively resulting in decreased strength and increased electric conductivity and ductility.

scholarly journals Microstructure and Mechanical Properties of Structural Steel after Dynamic Cold Working Deformation/ Wpływ Dynamicznego Odkształcenia Plastycznego Na Zimno Na Mikrostrukturę I Własności Stali Konstrukcyjnej

2014 ◽  
Vol 59 (4) ◽  
pp. 1699-1703 ◽  
Author(s):  
J. Pacyna ◽  
R. Dabrowski ◽  
E. Rozniata ◽  
A. Kokosza ◽  
R. Dziurka
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Impact Strength ◽  
Yield Stress ◽  
Cold Working ◽  
Strong Relationship ◽  
The Common ◽  
Reduction Of Area ◽  
Grade Steel

Abstract The results of the selected mechanical properties i.e. ultimate tensile strength (UTS), yield stress (YS), elongation (EL), reduction of area (RA), hardness (HV) and impact strength (KCV) of the common, S235JR grade steel, are presented in the paper. A strong relationship between the above mentioned properties and cooling rates after hot rolling of rods, made of this steel, was found. Additionally, the possibility of further enhancing of mechanical properties (UTS and YS) by the controlled, dynamic cold working, was shown. The use of such deformation, through changes in the microstructure allows for the upper yield stress (YS) increase - app. 10% and ultimate tensile strength UTS - app. 5%. Simultaneously, very high indicators of plasticity (EL, RA) and impact strength (KCV) are retained, as they were immediately after the rolling. The possibility of improving the mechanical properties of rods made of this steel grade has a great technological and commercial importance for its manufacturers, as well as for their final users.

Microstructure and Mechanical Properties of As-Rolled Mg-Zn-Gd-Ca-Mn Sheets

2014 ◽  
Vol 788 ◽  
pp. 68-73
Author(s):  
Sheng Shuan Dongye ◽  
Hong Yan ◽  
Xing Hao Du ◽  
Rong Shi Chen
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Magnesium Alloy ◽  
Ultimate Tensile Strength ◽  
Ambient Temperature ◽  
Hot Rolling ◽  
Basal Texture ◽  
Microstructure And Mechanical Properties ◽  
Zn Concentration ◽  
Elongation To Failure

The Mg-(4,6)Zn-1Ca-1RE-0.5Mn magnesium alloy sheets were processed by hot rolling, and the effect of Zn concentration on the microstructure and mechanical properties was investigated using OM,SEM and XRD technique. The Mg-4Zn-1Ca-1RE-0.5Mn sheet exhibits excellent tensile properties at ambient temperature with ultimate tensile strength of 332MPa and elongation to failure of 4.5%. The notable mechanical properties were attributed to fine DRX grains and large deformed grains with intense basal texture.

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