scholarly journals Effect of Zr Addition and Aging Treatment on the Tensile Properties of Al-Si-Cu-Mg Cast Alloys

2020 ◽  
Author(s):  
Jacobo Hernandez-Sandoval ◽  
Mohamed H. Abdelaziz ◽  
Agnes M. Samue ◽  
Herbert W. Doty ◽  
Fawzy H. Samuel
Keyword(s):  
Yield Strength ◽  
Tensile Properties ◽  
Tensile Testing ◽  
Quality Index ◽  
Prolonged Exposure ◽  
Aging Treatment ◽  
Tensile Tests ◽  
Heat Treated ◽  
Cast Alloys ◽  
Noticeable Reduction

The present study focused on the tensile properties at ambient and high temperatures of alloy 354 without and with the addition of zirconium. Tensile tests were performed on alloy samples submitted to various aging treatments, with the aim of understanding the effects of the addition made on the tensile properties of the alloy. Zirconium reacts only with Ti, Si, and Al in the alloys examined to form the phases (Al,Si)2(Zr,Ti) and (Al,Si)3(Zr,Ti). Testing at 25°C reveals that the minimum and maximum quality index values, 259 and 459 MPa, are observed for the as-cast and solution heat-treated conditions, respectively. The yield strength shows a maximum of 345 MPa and a minimum of 80 MPa within the whole range of aging treatments applied. The ultimate tensile and yield strength values obtained at room temperature for T5-treated samples stabilized at 250°C for 200 h are comparable to those of T6-treated samples stabilized under the same conditions, and higher in the case of elevated-temperature (250°C) tensile testing. Coarsening of the strengthening precipitates following such prolonged exposure at 250°C led to noticeable reduction in the strength values, particularly the yield strength, and a remarkable increase in the ductility values.

INCO ALLOY MS 250

Alloy Digest ◽  
1987 ◽  
Vol 36 (11) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Intermetallic Compound ◽  
Yield Strength ◽  
Physical Properties ◽  
Tensile Properties ◽  
Heat Treating ◽  
Low Carbon ◽  
Martensitic Matrix ◽  
Inco Alloy ◽  
Heat Treated

Abstract INCO Alloy MS 250 is a cobalt-free managing steel with nominal yield strength of 250,000 psi, fully heat-treated. Strengthening results from intermetallic-compound precipitation in a low-carbon martensitic matrix. It has excellent weldability. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SA-426. Producer or source: Inco Alloys International Inc..

Effect of Artificial Aging on Microstructures and Mechanical Properties of Extruded Mg Alloy ZK60

2014 ◽  
Vol 697 ◽  
pp. 72-75
Author(s):  
De Liang Yin ◽  
Jian Qiao ◽  
Hong Liang Cui
Keyword(s):  
Mechanical Properties ◽  
Yield Strength ◽  
Aging Time ◽  
Artificial Aging ◽  
Aging Treatment ◽  
Tensile Tests ◽  
Tensile Yield Strength ◽  
Uniaxial Tensile ◽  
Fracture Elongation ◽  
Strength And Ductility

An extruded ZK60 magnesium alloy was subjected to artificial aging at 180 oC for an investigation of the effect of aging time on its precipitation behavior and mechanical properties. Uniaxial tensile tests were conducted to obtain the mechanical properties. Optical microscopy and transmission electron microscopy (TEM) were employed to observe microstructure change before and after aging treatment. It is shown that, both tensile yield strength and ultimate tensile strength increases with aging time. The fracture elongation after aging for 20 h reaches up to 21.0%, and the yield strength increases to 269.5 MPa, 19.4% higher than that of extruded specimens (un-aged), showing a good match of strength and ductility. Three newly-formed precipitates were observed after aging for over 20 h, among which particulate and dispersive precipitates should be responsible for the good combination of strength and ductility.

Effect of High Temperature Caliber Rolling on Microstructure and Room Temperature Tensile Properties of Mg-3Al-1Zn (AZ31) Alloy

2013 ◽  
Vol 209 ◽  
pp. 6-9 ◽  
Author(s):  
Rajendra Doiphode ◽  
S.V.S. Narayana Murty ◽  
Nityanand Prabhu ◽  
Bhagwati Prasad Kashyap
Keyword(s):  
Tensile Strength ◽  
High Temperature ◽  
Yield Strength ◽  
Strain Rate ◽  
Tensile Properties ◽  
Room Temperature ◽  
Tensile Tests ◽  
Az31 Alloy ◽  
Rolling Temperature ◽  
Grain Sizes

Mg-3Al-1Zn (AZ31) alloy was caliber rolled at 250, 300, 350, 400 and 450 °C. The effects of caliber rolling temperature on the microstructure and tensile properties were investigated. The room temperature tensile tests were carried out to failure at a strain rate of 1 x 10-4s-1. The nature of stress-strain curves obtained was found to vary with the temperature employed in caliber rolling. The yield strength and tensile strength followed a sinusoidal behaviour with increasing caliber rolling temperature but no such trend was noted in ductility. These variations in tensile properties were explained by the varying grain sizes obtained as a function of caliber rolling temperature.

Mechanical Performance of a Cast A354 Aluminium Alloy

2014 ◽  
Vol 794-796 ◽  
pp. 489-494 ◽  
Author(s):  
J.H. Sandoval ◽  
Adel M.A. Mohamed ◽  
S. Valtierra ◽  
F.H. Samuel
Keyword(s):  
Tensile Properties ◽  
Quality Index ◽  
Mechanical Performance ◽  
Cast Alloy ◽  
Solution Treatment ◽  
Aging Treatment ◽  
Test Results ◽  
Cast Aluminum ◽  
Treatment Conditions ◽  
Cast Aluminum Alloys

Cast aluminum alloys are an important group of materials which find wide application in the automotive industry. Insufficient studies have been carried out to date with regard to the mechanical performance of the aged A354 alloy. Therefore, the present work investigates the Quality index charts with the purpose of setting the limits of the tensile properties, as well as for comparing the mechanical behavior of cast alloy A354, to delineate the effect of the solution treatment applied. Tensile properties upon artificial aging in the temperature range of 155–350oC for times ranging from 2 to 100 hours are also investigated. The results showed that the use of quality index charts is a satisfactory method for presenting tensile test results and, for assessing the effect of solution and aging treatment conditions subjected to the modified and grain-refined A354 alloys. It is also observed that the quality index, Q, is more sensitive to variations in the tensile ductility than to tensile strength.

Investigating the Effect of Miniaturization on the Microtensile Properties of Brass (CuZn30)

2011 ◽  
Author(s):  
Lauren B. Wuertemberger ◽  
Megan N. Chann ◽  
Richard M. Onyancha
Keyword(s):  
Strain Hardening ◽  
Tensile Properties ◽  
Material Properties ◽  
Tensile Tests ◽  
Strain Hardening Exponent ◽  
Manufacturing Processes ◽  
Strength Coefficient ◽  
Grain Sizes ◽  
Heat Treated ◽  
Average Grain Size

As everyday equipment becomes smaller and smaller, it is of increasing importance that the manufacturing processes used for metals are capable of producing parts of appropriate sizes. Currently, manufacturing processes assume macromaterial properties can be applied for microscale production, but is this a valid assumption? This paper investigates the accuracy of applying macroscale tensile properties in microscale applications. In order to test the soundness of this supposition, tensile tests were performed on both macroscale and microscale brass specimens, and the resulting calculated material properties, strain hardening exponent (n) and strength coefficient (K), were compared. Specimens were heat treated to various temperatures before tensile tests were performed, and the strength coefficient and strain hardening exponents of micro and macro tensile specimens were compared. Additionally, it is investigated whether average grain size correlates to material properties. The results showed that in general it is not accurate to apply macroscale tensile properties to microscale applications. However, at mesocale grain sizes, (12–20 microns), the strain hardening exponent values were similar for both macro and microscale specimens.

REPUBLIC HP 150

Alloy Digest ◽  
1964 ◽  
Vol 13 (11) ◽  
Keyword(s):  
Fracture Toughness ◽  
Yield Strength ◽  
Physical Properties ◽  
Tensile Properties ◽  
Alloy Steel ◽  
Heat Treating ◽  
Heavy Plate ◽  
Treated Condition ◽  
Heat Treated ◽  
Heat Treated Condition

Abstract Republic HP150 is an alloy steel designed to give 150,000 psi yield strength with exceptional toughness. The alloy is intended for fabrication in the heat treated condition principally for heavy plate sections. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on forming, heat treating, machining, and joining. Filing Code: SA-170. Producer or source: Republic Steel Corporation.

Effect of Magnesium and Artificial Aging on the Microstructure and Mechanical Properties of Al-Si-Mn-Mg Alloys

2009 ◽  
Vol 83-86 ◽  
pp. 415-420
Author(s):  
S.G. Shabestari ◽  
M.M. Hejazi ◽  
M. Bahramifar
Keyword(s):  
Mechanical Properties ◽  
Quality Index ◽  
Industrial Applications ◽  
Maximum Value ◽  
Microstructure And Mechanical Properties ◽  
Heat Treated ◽  
Cast Alloys ◽  
Mg Addition ◽  
Strength And Ductility ◽  
Magnesium Addition

The effect of magnesium addition up to 0.9 wt.% on the microstructure and mechanical properties of Al-9Si-0.35Mn alloy has been investigated in both as-cast and heat treated conditions. Generally, Mg addition increases the heat treatability and strength of the alloys at the expense of the lower ductility. High levels of magnesium addition, causes the formation of large and brittle intermetallics, a slight increase in porosity and hence, a decrease in ultimate tensile strength and ductility of the cast alloys. T6 heat treatment increases the strength of the alloys up to 80 percent compared to as-cast samples. Among the studied compositions, heat treated Al-9Si-0.35Mn-0.25Mg alloy, has the maximum value of quality index and can be regarded as a promising material with the optimum mechanical properties for industrial applications.

The Tensile Yield Strength of Certain Steels under Suddenly Applied Loads

1948 ◽  
Vol 159 (1) ◽  
pp. 1-10 ◽  
Author(s):  
F. V. Warnock ◽  
J. B. Brennan
Keyword(s):  
Yield Strength ◽  
Peak Load ◽  
Tensile Tests ◽  
Carbon Steels ◽  
Tensile Yield Strength ◽  
Impact Machine ◽  
Cast Steels ◽  
Heat Treated ◽  
Load Rate ◽  
Rate Of Loading

Dynamic tensile yield stresses are determined for eight steels, including one mild steel, two plain carbon steels, two carbon manganese steels, one heat-treated alloy, and two cast steels. The dynamic loads are applied by means of an impact machine of the falling weight type. An attachment is fitted to this machine to enable the peak load to be reached in 3 milli-seconds (0·003 second). Supplementary tests, in which the time to reach the peak load is 1 milli-second, are carried out on three of the steels. Electrical resistance strain gauges mounted directly on the specimens are used to record the loads. Comparison with static values reveals an increase in yield stress of from 21 to 36 per cent for the carbon steels under dynamic loading. This increase diminishes with increase in static yield strength. The annealed cast steels behave in a similar manner to the carbon steels, but the heat-treated alloy steel shows no appreciable increase in yield strength with increase in rate of loading. Comparison is also effected with some results of other investigators. A theory is put forward to account for the variation in sensitivity of yield strength to load rate. A division of tensile tests into three main types, on a basis of rate of loading, is suggested for future work.

Prediction of Tensile Properties Based on Hardness Measurement

2014 ◽  
Vol 606 ◽  
pp. 35-38 ◽  
Author(s):  
Pavol Zubko ◽  
Ladislav Pešek
Keyword(s):  
Tensile Strength ◽  
Yield Strength ◽  
Tensile Properties ◽  
Tensile Testing ◽  
Brinell Hardness ◽  
Hardness Measurement ◽  
Stress Strain ◽  
Hardness Values ◽  
Hollomon Equation ◽  
Good Agreement

The contribution deals with prediction of tensile properties based on measurement of microhardness. First of all, the database of stress strain, s-e vs. hardness data was created. Tensile strength, yield strength, ductility and parameters of Ludwig-Hollomon equation σ = σ0+kεn; k, n were correlated with hardness. Various hardness values found in literature were recalculated to Brinell hardness. In tensile testing measured s-e curves were compared with that obtained from the correlation. The investigated materials were API 5 L grade steels X70 after different deformation exposition. The results give good agreement between compared data. The most difference between estimated and measured curve is in area of yield strength, because of Lüders deformation on investigated steel.

scholarly journals Precipitation Behavior of Orthorhombic Phase in Ti-22Al-25Nb Alloy during Slow Cooling Aging Treatment and Its Effect on Tensile Properties

Metals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1515
Author(s):  
Beibei Wei ◽  
Bin Tang ◽  
Xiaofei Chen ◽  
Qin Xu ◽  
Shuaijin Zhang ◽  
...  
Keyword(s):  
Grain Boundaries ◽  
Tensile Properties ◽  
Aging Treatment ◽  
Microstructural Characterization ◽  
Orthorhombic Phase ◽  
Tensile Tests ◽  
Precipitation Behavior ◽  
Interface Instability ◽  
Slow Cooling ◽  
O Phase

The precipitation behavior of the orthorhombic (O) phase during the slow cooling aging treatment of Ti-22Al-25Nb (at.%) alloy was investigated by microstructural characterization. Then the effect of O phase precipitation on the tensile properties was studied by room-temperature tensile tests. The results showed that the precipitation of the O phase transformed from both grain boundaries and intragranular to only grain boundaries with the temperature increasing. The nucleation mechanism of the O phase from intergranular is composed of sympathetic nucleation and interface instability nucleation. In addition, the results of tensile tests indicated that the ultimate tensile strength of the alloy decreases as the precipitation of the O phase increases. Meanwhile, from the tensile results, it is concluded that the optimum heat treatment process is slow cooling after aging at 950 °C for 1 h.

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