scholarly journals Application of Arrhenius law to DP and zero-span tensile strength measurements taken on iron gall ink impregnated papers: relevance of artificial ageing protocols

2016 ◽  
Vol 122 (8) ◽  
Author(s):  
Véronique Rouchon ◽  
Oulfa Belhadj ◽  
Maroussia Duranton ◽  
Alice Gimat ◽  
Pascale Massiani
Keyword(s):  
Tensile Strength ◽  
Artificial Ageing ◽  
Arrhenius Law ◽  
Iron Gall

scholarly journals Achievement of High Strength and Ductility in Al–Si–Cu–Mg Alloys by Intermediate Phase Optimization in As-Cast and Heat Treatment Conditions

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 647 ◽  
Author(s):  
Bingrong Zhang ◽  
Lingkun Zhang ◽  
Zhiming Wang ◽  
Anjiang Gao
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Intermediate Phase ◽  
High Strength ◽  
Mg Alloys ◽  
Artificial Ageing ◽  
Treatment Conditions ◽  
Eutectic Si

In order to obtain high-strength and high-ductility Al–Si–Cu–Mg alloys, the present research is focused on optimizing the composition of soluble phases, the structure and morphology of insoluble phases, and artificial ageing processes. The results show that the best matches, 0.4 wt% Mg and 1.2 wt% Cu in the Al–9Si alloy, avoided the toxic effect of the blocky Al2Cu on the mechanical properties of the alloy. The addition of 0.6 wt% Zn modified the morphology of eutectic Si from coarse particles to fine fibrous particles and the texture of Fe-rich phases from acicular β-Fe to blocky π-Fe in the Al–9Si–1.2Cu–0.4Mg-based alloy. With the optimization of the heat treatment parameters, the spherical eutectic Si and the fully fused β-Fe dramatically improved the ultimate tensile strength and elongation to fracture. Compared with the Al–9Si–1.2Cu–0.4Mg-based alloy, the 0.6 wt% Zn modified alloy not only increased the ultimate tensile strength and elongation to fracture of peak ageing but also reduced the time of peak ageing. The following improved combination of higher tensile strength and higher elongation was achieved for 0.6 wt% Zn modified alloy by double-stage ageing: 100 °C × 3 h + 180 °C × 7 h, with mechanical properties of ultimate tensile strength (UTS) of ~371 MPa, yield strength (YS) of ~291 MPa, and elongation to fracture (E%) of ~5.6%.

Improvement of ultimate tensile strength by artificial ageing and retrogression treatment of aluminium alloy 6061

2016 ◽  
Vol 668 ◽  
pp. 201-207 ◽  
Author(s):  
Arturo Abúndez ◽  
Isa Pereyra ◽  
Bernardo Campillo ◽  
Sergio Serna ◽  
Enrique Alcudia ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Aluminium Alloy ◽  
Artificial Ageing ◽  
Alloy 6061

Study on Quenching and Artificial Ageing on Al-Si Alloy

2014 ◽  
Vol 803 ◽  
pp. 209-215
Author(s):  
Dragoş Cristian Achitei ◽  
Andrei Victor Sandhu ◽  
Mohd Mustafa Al Bakri Abdullah ◽  
Petrică Vizureanu ◽  
Hussin Kamarudin
Keyword(s):  
Tensile Strength ◽  
Aluminum Alloys ◽  
Structural Changes ◽  
Artificial Ageing ◽  
Thermal Treatments

Aluminum alloys have special advantages on the structural changes induced by thermal treatments. Thus, for proper machining a solution quenching is applied, when the hardness and the tensile strength of the alloy decreases. In order to restore the properties natural or artificial ageing is necessary.

scholarly journals STUDIES ON THE EFFECT OF ARTIFICIAL AGEING HARDNESS ON TENSILE PROPERTIES AND IMPACT STRENGTH OF AL-6SI-0.5MG-2NI ALLOY

2015 ◽  
Vol 16 (1) ◽  
Author(s):  
Abul Hossain ◽  
Abu Syedwais Kurny
Keyword(s):  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Impact Strength ◽  
Tensile Properties ◽  
The Other ◽  
Peak Hardness ◽  
Artificial Ageing ◽  
Impact Properties ◽  
Solution Treated ◽  
Standard Tests

The effect of different scheduled artificial ageing hardness on the tensile and impact properties of Al-6Si-0.5Mg-2Ni alloy was studied. The solution treated Al-6Si-0.5Mg-2Ni alloy was aged isochronally for 1 hour at temperatures up to 300oC. The precipitation stages during ageing were monitored by hardness measurements. Tensile and impact properties were determined by standard tests. During artificial ageing, the yield and ultimate tensile strength were found to increase with ageing hardness; the maximum being attained at peak hardness. Ductility and impact toughness of the alloy, on the other hand decreased with ageing hardness, reaching the minimum at the highest hardness. The strength of Al- 6Si-0.5Mg-2Ni alloy was best at highest hardness but exhibits poor ductility and impact strength. KEYWORDS: Al-6Si-0.5Mg-2Ni alloy; ageing; hardness; tensile properties; impact strength;

Study of the copper effect in iron-gall inks after artificial ageing

2018 ◽  
Vol 72 (8) ◽  
pp. 1905-1915 ◽  
Author(s):  
Giusj Valentina Fichera ◽  
Marco Malagodi ◽  
Pacifico Cofrancesco ◽  
Maduka L. Weththimuni ◽  
Clara Guglieri ◽  
...  
Keyword(s):  
Artificial Ageing ◽  
Iron Gall ◽  
Copper Effect

Effect of Second Phases on Tensile Property in Artificial Ageing and RRA Process of Super-High Strength Aluminum Alloy

2007 ◽  
Vol 546-549 ◽  
pp. 855-862
Author(s):  
Ai Lin Ning ◽  
Zhi Yi Liu ◽  
Chun Feng ◽  
Su Min Zeng
Keyword(s):  
Tensile Strength ◽  
Aluminum Alloy ◽  
Tensile Test ◽  
High Strength ◽  
Peak Strength ◽  
Artificial Ageing ◽  
High Strength Aluminum Alloy ◽  
Cu Alloy ◽  
Second Phases ◽  
Strengthening Particles

The evolution of second phases and its effect on tensile mechanical property in artificial ageing and RRA process of super-high strength aluminum alloy is investigated.The result of tensile test shows that the samples of Al-Zn-Mg-Cu-Ag alloy aged at lower temperature(100°C) not only have higher tensile strength up to 753Mpa but also relatively higher tensile elongation above 9% than normal temperature(120°C) in artificial ageing. The sample of Al-Zn-Mg-Cu alloy has the highest tension strength upto 788Mpa when aged at 100°C for 48 hours in single step of artificial ageing. Further more in RRA process samples of Al-Zn-Mg-Cu alloy preaged at 100°C for 24 hours retrogressed at 200°C for 7min and reaged at 100°Cfor 24 hours present the best tensile strength of 795Mpa than others. The tensile strength of Al-Zn-Mg-Cu alloy after RRA treated decreases with prolonging of retrogression time and reageing time starting from 7mins and 24 houres respectively. SEM observation shows that crack of the samples in tensile test is created at large particles in the fracture while there are more particles of undissolved phase in Al-Zn-Mg-Cu alloy containing Ag. TEM observation shows that the dominant strengthening particle corresponding to the peak strength of Al-Zn-Mg-Cu alloy containing Ag when aged at 120°C for 8 hours is η’ phase while dominant strengthening particle is G.P zone when aged at 100°C for 80 hours. However, η’ phase as the dominant strengthening particles corresponds to the peak strength of Al-Zn-Mg-Cu alloy without content of Ag when aged at 100°C for 48hours. TEM observation also shows that G.P zone as strengthening particle is dominant in the samples of Al-Zn-Mg-Cu alloy reaged at 100°C for 24 hours, and strengthening particles is coarsened when the sample is retrogressed at 200°C and reaged for a longer time. It is suggested that whether at the presence of coarse particles of undissolved phases or when G.P zone and η’ particle grow up in the retrogression ,sample needs deformable G.P zone instead of undeformable η’ in subsequent artificial ageing and reageing as dominant strengthening particle, in order to present a larger freedom spacing for dislocation to slip and let the sample not to behave too brittle to display high resistance to imposed plastic deformation or high tensile strength.

scholarly journals Influence of Disinfectants on Natural Textile Fibres

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Klára Drábková ◽  
Jan Krejčí ◽  
Markéta Škrdlantová ◽  
Michal Ďurovič ◽  
Bronislava Bacílková
Keyword(s):  
Silver Nanoparticles ◽  
Tensile Strength ◽  
Ethylene Oxide ◽  
Artificial Ageing ◽  
Colour Difference ◽  
Term Stability ◽  
Long Term Stability ◽  
Dry Heat ◽  
Textile Fibres

Abstract Textiles are frequently used in bookbinding or for attaching pendent seals and thus they are an integral part of archival and library items. Any part of these items can be contaminated by various microorganisms. Consequently, it is often necessary to include disinfection procedures in the initial stages of the conservation process. Primarily, the agents employed in conservation must not harm the treated material. This work was concerned with monitoring the effect of selected disinfectant agents (ethylene oxide, Septonex®, glutaraldehyde, Bacillol® AF, butanol vapours, Acticide® MV, silver nanoparticles, Chiroseptol®) on the properties and long-term stability of natural textile fibres (cotton and silk). The disinfected textiles were subjected to three kinds of artificial ageing (dry heat, moist heat, and light) and their properties were determined by means of the total colour difference, thread tensile strength and the limiting viscosity number.

Increase of the Elasticity and Strength of the Welded Joints for the Al-Mg-Li Alloy Made by the Laser Welding by Means of the Thermal Mechanical Processing

2018 ◽  
Vol 385 ◽  
pp. 385-390
Author(s):  
Aleksandr Malikov ◽  
Anatolii Orishich ◽  
Evgenij Karpov ◽  
Evgenij Sandalov
Keyword(s):  
Tensile Strength ◽  
Aluminum Alloy ◽  
Welded Joints ◽  
Thermal Processing ◽  
Mechanical Characteristics ◽  
Welded Joint ◽  
Strength Increase ◽  
Artificial Ageing ◽  
Mechanical Processing ◽  
Before And After

The paper deals with the analysis of the effect of the thermal mechanical processing on the mechanical characteristics (elasticity and tensile strength) of the welded joints of the aluminum alloy, the system Al-Mg-Li. The microstructures of the basic alloy and welded joint before and after the thermal processing are compared by electronic microscoping. The X-ray diffraction method is used to compare the phase composition. The concentration of the strengthening phase δʹ(Al3Li) reduces in the welded joint, which results in the low mechanical characteristics. The thermal processing, namely quenching, increases the concentration of the equilibrium S1 phase (Al2MgLi) in the welded joint as compared with an unquenched joint. The elasticity of the welded joint rises significantly at the almost constant strength, the value of the relative extension lies within the range of 2.4 – 19.2 % before and after quenching, respectively. Artificial ageing applied to the welded joint after the quenching gives the structurization of the S1 phase. The full thermal mechanical processing (quenching, elastic deformation, artificial ageing) of the welded joint of the aluminum alloy (the system AL-Mg-Li) results in the tensile strength increase up to 0.95 of the basic alloy strength.

Phase Transformations in Ti-7w/oMo-3w/oMe Alloy

1974 ◽  
Vol 32 ◽  
pp. 514-515
Author(s):  
S. Fujishiro
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Transmission Electron Microscopy ◽  
Tensile Strength ◽  
Mechanical Processing ◽  
Ray Method ◽  
X Ray ◽  
Transmission Electron ◽  
Water Quench ◽  
Alpha Beta

The mechanical properties of three titanium alloys (Ti-7Mo-3Al, Ti-7Mo- 3Cu and Ti-7Mo-3Ta) were evaluated as function of: 1) Solutionizing in the beta field and aging, 2) Thermal Mechanical Processing in the beta field and aging, 3) Solutionizing in the alpha + beta field and aging. The samples were isothermally aged in the temperature range 300° to 700*C for 4 to 24 hours, followed by a water quench. Transmission electron microscopy and X-ray method were used to identify the phase formed. All three alloys solutionized at 1050°C (beta field) transformed to martensitic alpha (alpha prime) upon being water quenched. Despite this heavily strained alpha prime, which is characterized by microtwins the tensile strength of the as-quenched alloys is relatively low and the elongation is as high as 30%.

Sign in / Sign up

Export Citation Format

Share Document