scholarly journals DEFORMATION AND FRACTURE OF ALPHA ZIRCONIUM ALLOYS (THE DUCTILITY OF ZIRCONIUM AND ITS ALLOYS). Final Report.

1971 ◽  
Author(s):  
Jr, J A Jensen ◽  
W A Backofen
Keyword(s):  
Zirconium Alloys ◽  
Final Report ◽  
Deformation And Fracture

Deformation and fracture of zirconium hydrides during the plastic straining of Zr-4

MRS Advances ◽  
2020 ◽  
Vol 5 (11) ◽  
pp. 559-567
Author(s):  
Luca Reali ◽  
Saïd El Chamaa ◽  
Daniel S. Balint ◽  
Catrin M. Davies ◽  
Mark R. Wenman
Keyword(s):  
Crack Nucleation ◽  
Zirconium Alloys ◽  
Temperature Deformation ◽  
Internal Stresses ◽  
Sem Images ◽  
Nucleation Sites ◽  
Deformation And Fracture ◽  
Zirconium Hydrides ◽  
Fission Reactors ◽  
Zr Alloy

ABSTRACTCrack initiation in zirconium alloys is an important issue for the safety of water-cooled fission reactors. Zirconium hydrides that precipitate in service are potential crack nucleation sites. In this work, the deformation and cracking of zirconium hydrides was studied during room temperature deformation of a Zircaloy-4 tensile sample up to fracture. The sample contained a hydrogen concentration of 100 ± 20 ppm. The main aims of this study were to better understand the mechanisms behind the hydride fracture in a polycrystalline matrix, and to identify at which point in the deformation of the Zr matrix the first hydrides break. Cracks thus nucleated may coalesce and propagate through the hydrided Zr-alloy. Scanning electron microscopy (SEM) images of a number of hydrides, both intergranular and intragranular, were taken at discrete increments of deformation during an interrupted tensile test. The results show that cracks in hydrides tend to always occur normal to the applied load, signalling the importance of the external stress. However, evidence is also provided to support the hypothesis that internal stresses generated by microstructural constraints may lead to the fracture of some intergranular hydrides.

scholarly journals Deformation and fracture characteristics of zirconium plate produced via ultrasonic additive manufacturing

2021 ◽  
Author(s):  
Caleb P. Massey ◽  
Nitish Bibhanshu ◽  
Maxim N. Gussev ◽  
Cody J. Havrilak ◽  
Andrew T. Nelson
Keyword(s):  
Additive Manufacturing ◽  
Failure Modes ◽  
Zirconium Alloys ◽  
Image Correlation ◽  
Fracture Mechanisms ◽  
Fracture Characteristics ◽  
Ultrasonic Additive Manufacturing ◽  
Deformation And Fracture ◽  
Deformation Modes

AbstractThe microstructural evolution, deformation modes, and fracture mechanisms of zirconium plate produced using ultrasonic additive manufacturing (UAM) are presented. In addition to conventional tensile testing techniques, digital image correlation captured highly variable strain accumulation in specimens loaded perpendicular or parallel to the build height (Z). When tested in parallel to Z, delamination at prior foil/foil interfaces creates strain localization noticeable in strain rate maps, whereas specimens loaded perpendicular to Z illustrate conventional strain hardening until necking accelerates delamination. Although bond strengths are statistically and spatially variable, in situ electron backscattering diffraction tests illustrate the ability for grains near interfaces to accommodate strain with twinning and slip modes consistent with conventionally produced zirconium alloys. Finally, mixtures of ductile and delamination-induced fracture highlight the interface-driven failure modes of UAM zirconium plate in the as-built condition. Graphic abstract

Deformation and fracture of alpha zirconium alloys

1972 ◽  
Vol 11 (1) ◽  
pp. 39-51 ◽  
Author(s):  
J.A. Jensen ◽  
W.A. Backofen
Keyword(s):  
Zirconium Alloys ◽  
Deformation And Fracture

Environmental cell studies of deformation and fracture

1990 ◽  
Vol 48 (4) ◽  
pp. 516-517
Author(s):  
H. K. Birnbaum ◽  
I. M. Robertson
Keyword(s):  
National Laboratory ◽  
Argonne National Laboratory ◽  
Damage Threshold ◽  
Chromatic Aberration ◽  
Good Choice ◽  
Point Of View ◽  
Deformation And Fracture ◽  
Environmental Cell ◽  
Gas Molecules ◽  
The University

Studies of the effects of hydrogen environments on the deformation and fracture of fcc, bcc and hep metals and alloys have been carried out in a TEM environmental cell. The initial experiments were performed in the environmental cell of the HVEM facility at Argonne National Laboratory. More recently, a dedicated environmental cell facility has been constructed at the University of Illinois using a JEOL 4000EX and has been used for these studies. In the present paper we will describe the general design features of the JEOL environmental cell and some of the observations we have made on hydrogen effects on deformation and fracture.The JEOL environmental cell is designed to operate at 400 keV and below; in part because of the available accelerating voltage of the microscope and in part because the damage threshold of most materials is below 400 keV. The gas pressure at which chromatic aberration due to electron scattering from the gas molecules becomes excessive does not increase rapidly with with accelerating voltage making 400 keV a good choice from that point of view as well. A series of apertures were placed above and below the cell to control the pressures in various parts of the column.

Deformation and fracture behavior of an Al-Li-Cu-Mg-Zr alloy 8090

1990 ◽  
Vol 48 (4) ◽  
pp. 974-975
Author(s):  
D.M. Jiang ◽  
B.D. Hong
Keyword(s):  
High Strength ◽  
Deformation And Fracture ◽  
Fracture Behaviors ◽  
Aluminum Lithium ◽  
Carbon Fiber Reinforced Composites ◽  
Peak Aged ◽  
Aluminum Lithium Alloys ◽  
High Strength Aluminum Alloys ◽  
Lithium Alloys ◽  
Zr Alloy

Aluminum-lithium alloys have been recently got strong interests especially in the aircraft industry. Compared to conventional high strength aluminum alloys of the 2000 or 7000 series it is anticipated that these alloys offer a 10% increase in the stiffness and a 10% decrease in density, thus making them rather competitive to new up-coming non-metallic materials like carbon fiber reinforced composites.The object of the present paper is to evaluate the inluence of various microstructural features on the monotonic and cyclic deformation and fracture behaviors of Al-Li based alloy. The material used was 8090 alloy. After solution treated and waster quenched, the alloy was underaged (190°Clh), peak-aged (190°C24h) and overaged (150°C4h+230°C16h). The alloy in different aging condition was tensile and fatigue tested, the resultant fractures were observed in SEM. The deformation behavior was studied in TEM.

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