Strengthening Mechanisms in Metallic Materials

The effect of lanthanum (La)+cerium (Ce) addition on the high-temperature strength of an aluminum (Al)–silicon (Si)–copper (Cu)–magnesium (Mg)–iron (Fe)–manganese (Mn) alloy was investigated. A great number of plate-like intermetallics, Al11(Ce, La)3- and blocky α-Al15(Fe, Mn)3Si2-precipitates, were observed. The results showed that the high-temperature mechanical properties depended strongly on the amount and morphology of the intermetallic phases formed. The precipitated tiny Al11(Ce, La)3 and α-Al15(Fe, Mn)3Si2 both contributed to the high-temperature mechanical properties, especially at 300 °C and 400 °C. The formation of coarse plate-like Al11(Ce, La)3, at the highest (Ce-La) additions, reduced the mechanical properties at (≤300) ℃ and improved the properties at 400 ℃. Analysis of the strengthening mechanisms revealed that the load-bearing mechanism was the main contributing mechanism with no contribution from thermal-expansion mismatch effects. Strain hardening had a minor contribution to the tensile strength at high-temperature.

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Effect of fabrication methods on microstructures, mechanical properties and strengthening mechanisms of Fe0.25CrNiAl medium-entropy alloy

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2021.161526 ◽

2021 ◽

pp. 161526

Author(s):

Danni Yang ◽

Yong Liu ◽

Nan Qu ◽

Tianyi Han ◽

Mingqing Liao ◽

...

Keyword(s):

Mechanical Properties ◽

Strengthening Mechanisms

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CuCrZr alloy produced by laser powder bed fusion: Microstructure, nanoscale strengthening mechanisms, electrical and mechanical properties

Materials Science and Engineering A ◽

10.1016/j.msea.2021.141915 ◽

2021 ◽

pp. 141915

Author(s):

C. Salvan ◽

L. Briottet ◽

T. Baffie ◽

L. Guetaz ◽

C. Flament

Keyword(s):

Mechanical Properties ◽

Powder Bed Fusion ◽

Strengthening Mechanisms ◽

Laser Powder Bed Fusion ◽

Powder Bed

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A Study on Estimation of S-N Curves for Structural Steels Based on their Static Mechanical Properties

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.891-892.1639 ◽

2014 ◽

Vol 891-892 ◽

pp. 1639-1644 ◽

Cited By ~ 2

Author(s):

Kazutaka Mukoyama ◽

Koushu Hanaki ◽

Kenji Okada ◽

Akiyoshi Sakaida ◽

Atsushi Sugeta ◽

...

Keyword(s):

Mechanical Properties ◽

Evaluation Method ◽

Materials Science ◽

Estimation Method ◽

Structural Steels ◽

Metallic Materials ◽

Fatigue Reliability ◽

Regression Parameters ◽

Static Mechanical ◽

Static Mechanical Properties

The aim of this study is to develop a statistical estimation method of S-N curve for iron and structural steels by using their static mechanical properties. In this study, firstly, the S-N data for pure iron and structural steels were extracted from "Database on fatigue strength of Metallic Materials" published by the Society of Materials Science, Japan (JSMS) and S-N curve regression model was applied based on the JSMS standard, "Standard Evaluation Method of Fatigue Reliability for Metallic Materials -Standard Regression Method of S-N Curve-". Secondly, correlations between regression parameters and static mechanical properties were investigated. As a result, the relationship between the regression parameters and static mechanical properties (e.g. fatigue limit E and static tensile strength σB) showed strong correlations, respectively. Using these correlations, it is revealed that S-N curve for iron and structural steels can be predicted easily from the static mechanical properties.

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Effect of Ti Element on Microstructure and Properties of Cu-Cr Alloy

Materials Science Forum ◽

10.4028/www.scientific.net/msf.817.307 ◽

2015 ◽

Vol 817 ◽

pp. 307-311 ◽

Cited By ~ 5

Author(s):

Peng Chao Zhang ◽

Jin Chuan Jie ◽

Yuan Gao ◽

Tong Min Wang ◽

Ting Ju Li

Keyword(s):

Mechanical Properties ◽

Solid Solution ◽

Spherical Shape ◽

Precipitation Strengthening ◽

Peak Hardness ◽

Ti Alloy ◽

Strengthening Mechanisms ◽

Vacuum Melting ◽

Solid Solution Strengthening ◽

Solution Strengthening

The Cu-Cr and Cu-Cr-Ti alloy plates were prepared by vacuum melting and plastic deformation. The effect of slight Ti element on microstructure and mechanical properties of Cu-Cr alloy was discussed. The result shows that Cr particles with spherical shape precipitated from Cu matrix after aging. Plenty Ti atoms dissolved in the vicinity of Cr particles and there were still parts of solid solution Ti atoms in other regions. Improvements in peak hardness and softening resistance were achieved with the addition of Ti element in Cu-Cr alloy. The addition of 0.1 wt.% Ti element makes Cu-Cr alloy possess tensile strength of 565 MPa and hardness of 185.9 HV after aging at 450 °C for 120 min, which can be attributed to multiple strengthening mechanisms, i.e. work hardening, solid solution strengthening and precipitation strengthening.

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Microstructure and mechanical properties of 15-5 PH stainless steel under different aging temperature

Metallurgical Research & Technology ◽

10.1051/metal/2021078 ◽

2021 ◽

Vol 118 (6) ◽

pp. 601

Author(s):

Chunhui Jin ◽

Honglin Zhou ◽

Yuan Lai ◽

Bei Li ◽

Kewei Zhang ◽

...

Keyword(s):

Mechanical Properties ◽

Stainless Steel ◽

Aging Temperature ◽

Electron Backscatter Diffraction ◽

Lath Martensite ◽

Optical Microscope ◽

Second Phase ◽

Strengthening Mechanisms ◽

Microstructure And Mechanical Properties ◽

Transmission Electron

The influence of aging temperature on microstructure and mechanical properties of Cr15Ni5 precipitation hardening stainless steel (15-5 PH stainless steel) were investigated at aging temperature range of 440–610 °C. The tensile properties at ambient temperature of the 15-5 PH stainless steel processed by different aging temperatures were tested, and the microstructural features were further analyzed utilizing optical microscope (OM), transmission electron microscope (TEM), electron backscatter diffraction (EBSD) as well as X-ray diffraction (XRD), respectively. Results indicated the strength of the 15-5 PH stainless steel was firstly decreased with increment of aging temperature from 440 to 540 °C, and then increased with the increment of aging temperature from 540 to 610 °C. The strength and ductility were well matched at aging temperature 470 °C, and the yield strength, tensile strength as well as elongation were determined to be 1170 MPa, 1240 MPa and 24%, respectively. The microstructures concerning to different aging temperatures were overall confirmed to be lath martensite. The strengthening mechanisms induced by dislocation density and the second phase precipitation of Cu-enriched metallic compound under different aging temperatures were determined to be the predominant strengthening mechanisms controlling the variation trend of mechanical properties corresponding to different aging temperatures with respect to 15-5 PH stainless steel.

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