scholarly journals Computational Characterization of Micro- to Macroscopic Mechanical Behavior and Damage of Polymers Containing Second-Phase Particles

2002 ◽  
Vol 11 (2) ◽  
pp. 129-149 ◽  
Author(s):  
Yoshihiro Tomita ◽  
Wei Lu
Keyword(s):  
Mechanical Behavior ◽  
Second Phase ◽  
Second Phase Particles

Nanoscale Three-Dimensional Microstructural Characterization of an Sn-Rich Solder Alloy Using High-Resolution Transmission X-Ray Microscopy (TXM)

2016 ◽  
Vol 22 (4) ◽  
pp. 808-813 ◽  
Author(s):  
Chandrashekara S. Kaira ◽  
Carl R. Mayer ◽  
V. De Andrade ◽  
Francesco De Carlo ◽  
Nikhilesh Chawla
Keyword(s):  
Fresnel Zone ◽  
Three Dimensional ◽  
Microstructural Characterization ◽  
Second Phase ◽  
Full Field ◽  
X Ray ◽  
Second Phase Particles ◽  
Rich Alloy ◽  
Nanoscale Features

AbstractThree-dimensional (3D) nondestructive microstructural characterization was performed using full-field transmission X-ray microscopy on an Sn-rich alloy, at a spatial resolution of 60 nm. This study highlights the use of synchrotron radiation along with Fresnel zone plate optics to perform absorption contrast tomography for analyzing nanoscale features of fine second phase particles distributed in the tin matrix, which are representative of the bulk microstructure. The 3D reconstruction was also used to quantify microstructural details of the analyzed volume.

Characterization of Recrystallization and Second-Phase Particles in Solution-Treated Additively Manufactured Alloy 718

2019 ◽  
Vol 51 (2) ◽  
pp. 973-981
Author(s):  
Achmad Ariaseta ◽  
Satoru Kobayashi ◽  
Masao Takeyama ◽  
Yuting Wang ◽  
Shinya Imano
Keyword(s):  
Second Phase ◽  
Alloy 718 ◽  
Solution Treated ◽  
Second Phase Particles

Characterization of Metallurgical Defects in the Melt Zone of 304L Steel Tubes Manufactured by GTAW Process

2012 ◽  
Vol 1372 ◽  
Author(s):  
J.J. Ruíz-Mondragón ◽  
J. Acevedo-Dávila ◽  
F. García-Vázquez ◽  
H.M. Hdz-García
Keyword(s):  
Second Phase ◽  
Thin Wall ◽  
Solidification Mode ◽  
Second Phase Particles ◽  
Gtaw Process ◽  
Metallurgical Defects ◽  
Formation Of Cracks ◽  
Cracking Pattern ◽  
304L Steel

ABSTRACTThis study consisted of the characterization of longitudinal cracking pattern observed in weld joint in the manufacture of 304L steel pipelines with thin wall thickness by GTAW process. These tubes are used in food and automotive industries. The cracks grown in the liquid-solid interdendritic zones at high temperatures. It was found that the cracks are associated with change on solidification mode and presence of the holes produced by shrinkage. The change in the solidification mode was associated with the presence of second phase particles. The results suggest that the formation of cracks is promoted by increasing current during the welding although the heat input is constant.

Characterization of constitutional liquid-film migration in Alloy 718

1994 ◽  
Vol 52 ◽  
pp. 906-907
Author(s):  
V. L. Acoff ◽  
R. D. Griffin ◽  
R. G. Thompson
Keyword(s):  
Liquid Film ◽  
Second Phase ◽  
Alloy 718 ◽  
Nickel Based Superalloy ◽  
High Temperature Mechanical Properties ◽  
Constitutional Liquation ◽  
Second Phase Particles ◽  
Liquid Film Migration

Alloy 718 is a nickel-based superalloy which consists of an FCC solid solution of Ni, Fe, and Cr strengthened with γ″ precipitates. The composition of the alloy is shown in Table 1. It has excellent high temperature mechanical properties and oxidation resistance. However, Alloy 718 is susceptible to hot cracking in weld heat affected zones (HAZ) as a result of the formation of intergranular liquid. This metastable grain boundary liquid may be due to “constitutional liquation” of second phase particles, known as constitutional liquid film migration (CLFM). Radhakrishnan and Thompson report that CLFM can occur in situ in the weld HAZ of alloy 718 as a result of constitutional liquation.Constitutional liquation can be described in terms of a binary alloy with a phase diagram such as theone shown in Figure 1. If an alloy of composition C° is rapidly heated above theeutectic temperature, TE, to temperature T, the AB particles will not have sufficient time to dissolve, as dictated by equilibrium.

Characterization of second-phase particles in two aluminium foil alloys

2016 ◽  
Vol 660 ◽  
pp. 276-288 ◽  
Author(s):  
Martin Lentz ◽  
Galyna Laptyeva ◽  
Olaf Engler
Keyword(s):  
Second Phase ◽  
Aluminium Foil ◽  
Second Phase Particles

Microstructural Characterization of Ultrasonically Welded Aluminum

2005 ◽  
Vol 127 (1) ◽  
pp. 65-74 ◽  
Author(s):  
S. M. Allameh ◽  
C. Mercer ◽  
D. Popoola ◽  
W. O. Soboyejo
Keyword(s):  
Mechanical Properties ◽  
Welded Joints ◽  
Weld Zone ◽  
Microstructural Characterization ◽  
Weld Interface ◽  
Fatigue Properties ◽  
Second Phase ◽  
Welding Time ◽  
Second Phase Particles

The microstructure and mechanical properties of ultrasonically welded AA6111-T4 specimens are discussed. The effects of welding time on the mechanical properties of welded joints are investigated. A longer welding time results in a more continuous welded interface and higher yield and fracture strengths. Accordingly, fatigue properties of the welded specimens with longer welding times are improved. The results of electron microscopy on the cross section of ultrasonically welded joints show three distinct zones: weld zone, weld affected zone and compression zone each with a distinct microstructure. TEM results show nanocrystalline grains along with second phase particles in the range of 15–25 nm in the weld zone. Flow patterns consistent with the geometry of weld–tip were observed at the weld interface.

Microstructural Characterization of 5083 Al Alloy Joints Friction Stir Welded

2006 ◽  
Vol 514-516 ◽  
pp. 510-515
Author(s):  
Mónica Reis ◽  
Rui Louro ◽  
Paulo J. Morais ◽  
Leonel Santos ◽  
Helena Gouveia
Keyword(s):  
Microstructural Characterization ◽  
Auger Spectroscopy ◽  
Al Alloy ◽  
Second Phase ◽  
Friction Stir ◽  
Second Phase Particles ◽  
Joint Properties ◽  
Structural Applications ◽  
Onion Ring

The Friction Stir Welding (FSW) process is a quite recent joining method whose particular characteristics yield to materials modifications not yet fully understood. This paper aims to present the research results of a study focused on the modifications induced in an aluminium alloy AA5083 – H111, when processed by FSW to build components for structural applications. The welded samples were firstly analysed by optical microscopy in order to define the different joined zones and to identify defects. Further tests included the measurement of the Vickers microhardness, grain and particle distribution and chemical analysis of the constituents, particularly of the intermetallic second phase particles, by Auger spectroscopy. Special attention has been given to the characterisation of several microstructural “non-homogeneities” like a laminated structure called onion ring and an identified anomaly (in the form of a line), whose presence was evaluated in order to determine its effects on the final joint properties. The results have shown important new details about the relationship between the microstructure and the final joint structural properties, contributing to improve the knowledge about the materials behaviour increasing the potential of utilization of the FSW process.

Evaluation of Burnished Subsurface Mechanical Behavior Using Nanoindentation

2011 ◽  
Vol 686 ◽  
pp. 546-552
Author(s):  
Hong Yun Luo ◽  
Zhi Yuan Han ◽  
Qun Peng Zhong
Keyword(s):  
Mechanical Properties ◽  
Mechanical Behavior ◽  
Surface Integrity ◽  
Main Part ◽  
Small Scale ◽  
Second Phase ◽  
Research Results ◽  
Second Phase Particles ◽  
Burnishing Process

The performance and life of machined components in service are mainly effect by their surface integrity. Burnishing process is a kind of chipless processing which improve the surface integrity obviously. A subsurface “hardness film” is formed during the processing. Subsurface mechanical behavior is the main part of surface integrity. Since the very small scale of the subsurface in burnished surface nanoindentation is used to identify how the local changes of microstructure influence the hardness distributions of subsurface mechanical properties. This study focuses on the relationships between burnishing parameters (burnishing feed and burnishing depth) and nanohardness. A series of burnishing processing experiments and nanoindentation tests were conducted on the surface of the burnished samples. The microstructure and nanoindentation research results indicate that there is no visible phase transformed region in the subsurface of burnished specimens, the hardening film is larger than 4 micro meters, the nanohardness is about 2.2~3.5Gpa which depends on the burnishing parameters and distribution and position of the second phase particles, while the nanohardness in turned material is about 1.8Gpa.

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