The Role of Defects on Tensile Deformation and Fracture Mechanisms of AM AlSi10Mg Alloy at Room Temperature and 250℃

2021 ◽  
pp. 108215
Author(s):  
Jianguang Bao ◽  
Zhengkai Wu ◽  
Shengchuan Wu ◽  
Dianyin Hu ◽  
Wei Sun ◽  
...  
Keyword(s):  
Room Temperature ◽  
Tensile Deformation ◽  
Fracture Mechanisms ◽  
Deformation And Fracture

scholarly journals The Role of Hydrogen on the Behavior of Intergranular Cracks in Bicrystalline α-Fe Nanowires

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 294
Author(s):  
Jiaqing Li ◽  
Cheng Lu ◽  
Long Wang ◽  
Linqing Pei ◽  
Ajit Godbole ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Nanocrystalline Materials ◽  
Fracture Mechanisms ◽  
Bulk Materials ◽  
Cleavage Process ◽  
Deformation And Fracture ◽  
Dynamics Simulations ◽  
Crack Trapping ◽  
Cleavage Failure

Hydrogen embrittlement (HE) has been extensively studied in bulk materials. However, little is known about the role of H on the plastic deformation and fracture mechanisms of nanoscale materials such as nanowires. In this study, molecular dynamics simulations are employed to study the influence of H segregation on the behavior of intergranular cracks in bicrystalline α-Fe nanowires. The results demonstrate that segregated H atoms have weak embrittling effects on the predicted ductile cracks along the GBs, but favor the cleavage process of intergranular cracks in the theoretically brittle directions. Furthermore, it is revealed that cyclic loading can promote the H accumulation into the GB region ahead of the crack tip and overcome crack trapping, thus inducing a ductile-to-brittle transformation. This information will deepen our understanding on the experimentally-observed H-assisted brittle cleavage failure and have implications for designing new nanocrystalline materials with high resistance to HE.

Effect of Interphase Boundary Character on Mechanical Properties in NiAl(β) Bicrystals with Ni 3Al(γ') Precipitates along Grain Boundary

2002 ◽  
Vol 753 ◽  
Author(s):  
Toshiya Sakata ◽  
Hiroyuki Y. Yasuda ◽  
Yukichi Umakoshi
Keyword(s):  
Mechanical Properties ◽  
Interphase Boundary ◽  
Fracture Stress ◽  
Room Temperature ◽  
Tensile Deformation ◽  
Deviation Angle ◽  
Boundary Character ◽  
Temperature Fracture ◽  
Boundary Sliding

ABSTRACTRole of the crystallography of Ni 3Al(γ') precipitates along grain boundaries of NiAl(β) in the mechanical properties was systematically investigated using β bicrystals with controlled orientations. γ' phase preferentially precipitated along βgrain boundaries showing a film-like shape. The selected variant of γ'-film satisfied the Kurdjumov-Sachs (K-S) relation with a neighboring βcrystal but it deviated from the relation with another adjacent βcrystal. In the course of tensile deformation at room temperature, fracture occurred preferentially at incoherent (β/γ') interphase boundary deviating from the K-S relation and the fracture stress decreased with increasing deviation angle. In contrast, the interphase boundary sliding occurred preferentially at irrational (β/γ') interface at 1073K. The sliding displacement increased with increasing deviation angle. Thus, the mechanical properties of β bicrystals with γ'-film were found to depend strongly on the interphase boundary character.

Plastic zone at crack tip: A nanolab for formation and study of metallic glassy nanostructures

2009 ◽  
Vol 24 (9) ◽  
pp. 2986-2992 ◽  
Author(s):  
X.X. Xia ◽  
Wei H. Wang ◽  
A. Lindsay Greer
Keyword(s):  
Fracture Surface ◽  
Plastic Zone ◽  
Metallic Glasses ◽  
Room Temperature ◽  
Crack Tip ◽  
Plastic Zone Size ◽  
Fracture Mechanisms ◽  
Clear Correlation ◽  
Zone Size ◽  
Deformation And Fracture

We report that various metallic glassy nanostructures including nanoridges, nanocones, nanowires, nanospheres, and nanoscale-striped patterns are spontaneously formed on the fracture surface of bulk metallic glasses at room temperature. A clear correlation between the dimensions of these nanostructures and the size of the plastic zone at the crack tip has been found, providing a way to control nanostructure sizes by controlling the plastic zone size intrinsically or extrinsically. This approach to forming metallic glassy nanostructures also has implications for understanding the deformation and fracture mechanisms of metallic glasses.

Deformation and Fracture of a Magnesium Alloy at Elevated Temperatures

2013 ◽  
Vol 592-593 ◽  
pp. 75-78
Author(s):  
Pavel Lukáč ◽  
Tibor Donič ◽  
Mária Chalupová ◽  
Peter Palček ◽  
Zuzanka Trojanová ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Initial Strain Rate ◽  
Rapid Decrease ◽  
Tensile Yield Strength ◽  
Fracture Mechanisms ◽  
Deformation And Fracture ◽  
Deformation Tests ◽  
Scanning Electron

Magnesium alloy EZ10 was deformed in tension at temperatures from room temperature up to 400 °C with an initial strain rate of 2.7x10-3s-1. Deformation tests showed a rapid decrease of the tensile yield strength at temperatures higher than 300 °C. Microstructure of the deformed samples was analysed with light microscope. Fracture mechanisms were estimated using scanning electron microscopy.

scholarly journals Tensile deformation and fracture mechanisms of Cu/Nb nanolaminates studied by in situ TEM mechanical tests

2018 ◽  
Vol 25 ◽  
pp. 60-65 ◽  
Author(s):  
Z. Liu ◽  
M.A. Monclús ◽  
L.W. Yang ◽  
M. Castillo-Rodríguez ◽  
J.M. Molina-Aldareguía ◽  
...  
Keyword(s):  
Tensile Deformation ◽  
Mechanical Tests ◽  
Fracture Mechanisms ◽  
In Situ Tem ◽  
Deformation And Fracture

Tensile deformation and fracture of Ti–5Al–5V–5Mo–3Cr–1.5Zr–0.5Fe alloy at room temperature

2013 ◽  
Vol 587 ◽  
pp. 100-109 ◽  
Author(s):  
Dongyang Qin ◽  
Yafeng Lu ◽  
Dizi Guo ◽  
Li Zheng ◽  
Qian Liu ◽  
...  
Keyword(s):  
Room Temperature ◽  
Tensile Deformation ◽  
Deformation And Fracture

scholarly journals Deformation and fracture behaviour of the γ-TiAl based intermetallic alloys

2021 ◽  
Vol 121 (4) ◽  
Author(s):  
M.N. Mathabathe ◽  
A.S. Bolokang ◽  
G. Govender ◽  
C.W. Siyasiya ◽  
R.J. Mostert
Keyword(s):  
Room Temperature ◽  
Tensile Deformation ◽  
Quaternary Alloy ◽  
Nominal Composition ◽  
Second Phase ◽  
Intermetallic Alloys ◽  
Fracture Surfaces ◽  
Deformation And Fracture ◽  
Cast Condition ◽  
Microstructural Examination

SYNOPSIS The ß-solidifying g-TAl intermetallic alloys of nominal composition Ti-48Al (binary alloy), Ti-48Al-2Nb (ternary alloy), Ti-48Al-2Nb-0.7Cr (quaternary alloy), and Ti-48Al-2Nb-0.7Cr-0.3Si (quinary alloy) (in at.%) were developed. The materials produced were tensile tested at room temperature. The as-cast microstructures and fracture surfaces of the tensile tested specimens were examined using conventional metallographic methods. Microstructural examination indicated that the alloys were comprised of lamellar structures (a2+γ) embedded in columnar dendritic cores in the as-cast condition. However, the quinary alloy contained a T5Si3 second phase. The alloys exhibited no detectable ductility during tensile deformation, indicating the brittleness of all the materials. The fracture surfaces revealed that the alloys failed by translamellar fracture with correspondingly few cleavage facets. Keywords: γ-TlAl based alloys, ß-solidifying, translamellar fracture.

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