Effects of Biaxial Pre-Stretching on Microstructures and Mechanical Properties of 2024 Aluminum Alloy Thin Plates

2014 ◽  
Vol 472 ◽  
pp. 607-611 ◽  
Author(s):  
Jian Jun Wu ◽  
Rui Chao Guo ◽  
Hao Li ◽  
Shen Zhang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Aluminum Alloy ◽  
Electron Microscope ◽  
Plane Strain ◽  
Transmission Electron Microscope ◽  
Strain State ◽  
Thin Plates ◽  
2024 Aluminum Alloy ◽  
Transmission Electron

Biaxial pre-stretching is implemented by bulge forming model. After engraved circular grids on new quenching blank, the specimen is biaxially pre-stretching formed. We use JGX-2 Engineering Microscope to measure principal pre-stretching points with 1.5%-3.1% elongation, which are in plane strain state. Hardness is measured by GYZJ 934-1 type Barcol Hardness and microstructures are observed by JEM-200CX Transmission Electron Microscope. The result shows that the influence on tensile strength of biaxial pre-stretching for new quenching state specimen is not big; however, it is the principal pre-stretching quantity 1.75% that improves microstructure and hardness.

Effect of Mg/Si Ratio on Hardening Behavior, Microstructure and Properties of Al-Mg-Si Alloys

2022 ◽  
Vol 905 ◽  
pp. 56-60
Author(s):  
Ya Ya Zheng ◽  
Tao Long ◽  
Bing Li
Keyword(s):  
Mechanical Properties ◽  
Electron Microscope ◽  
Transmission Electron Microscope ◽  
Intergranular Corrosion ◽  
Corrosion Test ◽  
Electrochemical Test ◽  
Microstructure And Properties ◽  
Hardening Behavior ◽  
Transmission Electron ◽  
Precipitation Behaviour

The effects of Mg/Si ratio on precipitation behaviour and properties of Al-Mg-Si alloys were studied by using electrochemical test, corrosion test and transmission electron microscope (TEM). The results show that with the increases of Mg/Si ratio from 0.9 to 1.1, the density of the β" decreases, and the mechanical properties decrease. When the ratio of Mg/Si increases from 1.0 to 1.1, the density y of β" does not increase significantly, but the continuous degree of the MgSi phase decreases significantly. The source of cracks originate from MgSi phase, which reduces the mechanical properties. When the Mg/Si ratio is 0.9, the alloy is in an over-Si state, which results in serious intergranular corrosion (IGC).

scholarly journals Study on fracture behavior of individual InAs nanowires using an electron-beam-drilled notch

RSC Advances ◽  
2017 ◽  
Vol 7 (27) ◽  
pp. 16655-16661 ◽  
Author(s):  
Suji Choi ◽  
Jong Hoon Lee ◽  
Min Wook Pin ◽  
Dong Won Jang ◽  
Seong-Gu Hong ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Electron Beam ◽  
Electron Microscope ◽  
Transmission Electron Microscope ◽  
Fracture Behavior ◽  
Tensile Loading ◽  
Uniaxial Tensile ◽  
Transmission Electron ◽  
Inas Nanowires ◽  
Uniaxial Tensile Loading

The mechanical properties and fracture behavior of individual InAs nanowires (NWs) were investigated under uniaxial tensile loading in a transmission electron microscope.

Microstructural Characterization of an Al-Mg-Si Aluminum Alloy Processed by Equal Channel Angular Pressing

2013 ◽  
Vol 745-746 ◽  
pp. 303-308
Author(s):  
Zhen Zhang ◽  
Man Ping Liu ◽  
Ying Da Yu ◽  
Pål C. Skaret ◽  
Hans Jørgen Roven
Keyword(s):  
Aluminum Alloy ◽  
Electron Microscope ◽  
High Resolution ◽  
Dislocation Density ◽  
Equal Channel Angular Pressing ◽  
Transmission Electron Microscope ◽  
Microstructural Characterization ◽  
Dark Field ◽  
Angular Pressing ◽  
Transmission Electron

In the present work, a peak-aged 6061 Al-Mg-Si aluminum alloy was subjected to equal channel angular pressing (ECAP) at 110 °C. The microstructure of the sample was characterized by high-resolution transmission electron microscope and weak-beam dark-field method. It was shown that the dislocation density in some local areas is much lower than the average dislocation density expected in the usual alloys processed by severe plastic deformation. High-resolution transmission electron microscope observations indicated that many full dislocations were dissociated into partial dislocations connected by stacking faults. In addition, a Z-shaped defect (i.e., a type of dislocation locks) probably formed by the reactions of the partials in different {111} planes was first observed in the ECAPed alloy. Furthermore, the precipitation behavior and sequence in the present ECAPed sample were identified by high-resolution transmission electron microscopy.

Metallographic Investigation on the Effect of Cryogenic Temperature on Steel Weldments

2014 ◽  
Vol 629 ◽  
pp. 456-460 ◽  
Author(s):  
S. Rasool Mohideen ◽  
Ahmad Zaidi Ahmad Mujahid ◽  
Abdullah Shohaimi ◽  
S. Ravi
Keyword(s):  
Mechanical Properties ◽  
Electron Microscope ◽  
Transmission Electron Microscope ◽  
Low Temperatures ◽  
Cryogenic Temperature ◽  
Liquid Nitrogen Temperature ◽  
Optical Microscope ◽  
Low Alloy Steel ◽  
Transmission Electron ◽  
Properties Of Materials

Materials are subjected to low temperatures either intentionally as in the case of cryogenic fuels or non-intentionally as in the case of aerospace environment and are observed to undergo changes in their properties. Microstructural changes are the premier indications of changes in the properties of materials. This paper investigates the effect of cryogenic temperature on the microstructure of low alloy steel weldments. The weldments were subjected to liquid nitrogen temperature of 77K and the microstructures were analyzed using optical microscope and transmission electron Microscope. A distinct change in the microstructure was observed which would reason out the changes in the mechanical properties of weldments.

Visualizing the Behavior of Dislocations—Seeing is Believing

MRS Bulletin ◽  
2008 ◽  
Vol 33 (2) ◽  
pp. 122-131 ◽  
Author(s):  
Ian M. Robertson ◽  
Paulo J. Ferreira ◽  
Gerhard Dehm ◽  
Robert Hull ◽  
Eric A. Stach
Keyword(s):  
Mechanical Properties ◽  
Electron Microscope ◽  
Transmission Electron Microscope ◽  
Image Manipulation ◽  
Recording Media ◽  
Computational Power ◽  
Stage Design ◽  
Transmission Electron ◽  
Properties Of Materials ◽  
Rate Limiting

AbstractThe spatial resolution of the transmission electron microscope makes it an ideal environment in which to continuously track the real-time response of a system to an external stimulus and to discover and quantify the rate-limiting fundamental microscopic processes and mechanisms governing the macroscopic properties. Advances in instrumentation, stage design, recording media, computational power, and image manipulation software are providing new opportunities for not only observing the microscopic mechanisms but also measuring concurrently the macroscopic response. In this article, the capability of this technique as applied to mechanical properties of materials is highlighted.

Effect of Retrogression Time on the Mechanical Properties and Stress Corrosion Cracking Behavior of 7A60 Aluminum Alloy

2012 ◽  
Vol 562-564 ◽  
pp. 227-233 ◽  
Author(s):  
Xue Hui Wang ◽  
Ji Hui Wang ◽  
Jie Song ◽  
Cong Wei Fu
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Tensile Strength ◽  
Aluminum Alloy ◽  
Stress Corrosion ◽  
Micro Structure ◽  
Cracking Behavior ◽  
Transmission Electron ◽  
Stress Corrosion Resistance ◽  
Corrosion Behaviors

7A60 aluminum alloy was treated under different retrogression time, and the micro-structure, mechanical properties and stress corrosion behaviors were observed and determined by optical microscopy, transmission electron microscopy and slow strain rate tester. The results shown that with the increasing of retrogression time the precipitates within the grains were gradually grown up, and the precipitates along the grain boundaries were changed from small and closely spaced into coarse and widely spaced ones. The elongation and toughness ratio of 7A60 alloy increased obviously with the retrogression time, whereas the tensile strength and hardness of 7A60 alloy decreased. The optimum retrogression time is about 60min, under which 7A60 alloy has a best combination of tensile strength, ductility and stress corrosion resistance.

In Situ Straining Experiments On Fe70AL30 Single Crystals

1994 ◽  
Vol 364 ◽  
Author(s):  
G. Molenat ◽  
H. Rösner ◽  
E. Nembach
Keyword(s):  
Mechanical Properties ◽  
Electron Microscope ◽  
Single Crystals ◽  
Yield Stress ◽  
Transmission Electron Microscope ◽  
Intermetallic Alloys ◽  
Temperature Range ◽  
Transmission Electron

AbstractWith an aim to contributing to the understanding of the mechanical properties of Fe3Al-based intermetallic alloys, Fe-30 at. % Al single crystals have been strained in a transmission electron microscope below and in the temperature range of the yield stress anomaly (at 300K and 573K respectively).

Microstructure and Porous Defects of a Spray-Formed and Hot Worked 7000 Aluminum Alloy

2016 ◽  
Vol 879 ◽  
pp. 1778-1782
Author(s):  
Shu Hui Huang ◽  
Zhi Hui Li ◽  
Bai Qing Xiong ◽  
Yon Gan Zhang ◽  
Xi Wu Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Aluminum Alloy ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Hot Isostatic Pressing ◽  
Aging Treatment ◽  
Hot Extrusion ◽  
Evolution Of Microstructure ◽  
Scanning Electron

The evolution of microstructure and porous defects of a spray-formed 7000 Aluminum alloy is researched in this paper. The spray-formed alloy is treated by hot isostatic pressing (HIP), homogenization, hot extrusion, solution and aging treatment. Metallographic microscope, scanning electron microscope (SEM) and tensile test are used to research the microstructure and mechanical properties. The results show that, there are two kinds of porous defects in spray-formed alloy, which has gas and no gas. The porous defects of spray-formed ingot can be mostly eliminated by HIP and hot extrusion. After solution and aging treatment, the tensile strength and elongation reach 757MPa and 10.2%, respectively.

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