The Effect of Pulse Current on Microstructure and Mechanical Property of the Pure Aluminum

2014 ◽  
Vol 703 ◽  
pp. 119-123
Author(s):  
Yao Li ◽  
Shu Hua Peng ◽  
Jun Jie Yang
Keyword(s):  
Mechanical Property ◽  
Tensile Strength ◽  
Grain Boundary ◽  
Current Density ◽  
Pulse Current ◽  
Pure Aluminum ◽  
Boundary Part ◽  
Dislocation Cells ◽  
Microstructure And Mechanical Property ◽  
Dislocation Walls

The tensile experiments were carried out under the condition of different pulse current on pure aluminum to analyze the effect of pulse current on the mechanical property such as tensile strength and elongation on material. The results show that pulse current could improve the mechanical properties and with pulse current the elongation of the aluminum increased to 19.5% and its tensile strength drops to some extent with the increase of electricity. At the same time, the dislocation structure features under different current density are also different. Without pulse current, dislocation is distributed as group unevenly. But when the current density J=8×102A/cm2, dislocation morphology changed into a mass of dislocation cells and moved to the grain boundary. Part of the cell walls formed grain boundary and then small angle subgrain formed. With the increase of current density, dislocation walls are arranged neatly and parallel to each other and at last single dislocation wall will be split into two or more parallel dislocation walls and form structure of striped band.

Simulating the Effect of Current Pulse on Plasticity of the Pure Aluminum 1A99

2013 ◽  
Vol 818 ◽  
pp. 58-63
Author(s):  
Shu Hua Peng ◽  
Jun Jie Yang ◽  
Yao Li
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Plastic Deformation ◽  
Tensile Strength ◽  
Current Pulse ◽  
Current Density ◽  
Pulse Current ◽  
Pure Aluminum ◽  
Heating Effect ◽  
Pure Metals

In this paper, pure metals aluminum was used to study the effects of pulse current on their mechanical properties. The results showed that the pulse current caused the tensile strength of metals to decline remarkably. The elongation of metal rose and was enhanced with increasing current density. At the same time during the performance of plastic deformation, pulse current heating effect could change the mechanical property to some extent and can not be ignored.

Effects of a Small Addition of Cu or Ge on the Microstructure and Mechanical Property of an Al-Si Alloy

2006 ◽  
Vol 519-521 ◽  
pp. 425-430 ◽  
Author(s):  
Keiyu Nakagawa ◽  
Teruto Kanadani ◽  
Kenich Nakayama ◽  
Akira Sakakibara
Keyword(s):  
Mechanical Property ◽  
Tensile Strength ◽  
Fatigue Strength ◽  
Grain Boundary ◽  
Binary Alloy ◽  
Tensile Loading ◽  
Small Addition ◽  
Microstructure And Mechanical Property

In this study, we investigated the effects of a small addition of Cu (0.1%) or Ge (0.1%) on the microstructure and mechanical property of Al-Si alloys. The results are as follows. The size of precipitates in the Cu-added or Ge-added alloys is smaller than that in the binary alloy. The size of the precipitates at the grain boundary in the Cu-added or Ge-added alloys is larger than the size of the precipitates in the binary alloy. However, the number of the precipitates at the grain boundary in the Cu-added and Ge-added alloys is smaller than that in the binary alloy. It was found that a small addition of Cu or Ge has the effect of raising the fatigue strength under repeated tensile loading as well as the tensile strength.

Effects of Nd on the Microstructure and Mechanical Property of ZA52 Alloy

2005 ◽  
Vol 488-489 ◽  
pp. 161-164
Author(s):  
Honghui Zou ◽  
Xiao Qing Zeng ◽  
Chun Quan Zhai ◽  
Wen Jiang Ding
Keyword(s):  
Mechanical Property ◽  
Grain Boundary ◽  
Tensile Test ◽  
Total Elongation ◽  
Al Alloy ◽  
Nd Addition ◽  
A Priority ◽  
Property Changes ◽  
Microstructure And Mechanical Property

Microstructure and mechanical property changes brought by the addition of Nd element in Mg-5wt%Zn-2wt%Al alloy are investigated, results show Al element takes a priority to react with Nd element over Mg and Zn, forming binary phases Al2Nd or Al11Nd3, tensile test showed that the total elongation is improved by the addition of Nd, and the UTS is also elevated when the Nd content surpass 1wt%. With a larger Nd addition, the phase dominating grain boundary is Al11Nd3 phase.

Microstructure and Mechanical Property Analysis of the Metal Part by SLM

2013 ◽  
Vol 423-426 ◽  
pp. 693-698 ◽  
Author(s):  
Qun Qin ◽  
Guang Xia Chen
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Tensile Strength ◽  
Stainless Steel ◽  
Steel Powder ◽  
Stainless Steel Powder ◽  
Micro Hardness ◽  
Metal Part ◽  
Tensile Experiment ◽  
Microstructure And Mechanical Property

The objective of the research was that analyzed the microstructure and mechanical properties of metal part built by SLM in this paper. The tensile samples were made by SLM, the rupture gotten with tensile experiment was scan by SEM, and the rupture property was analyzed. The results of experiment showed: the parts formed by optimized parameters have a density above 96%, a tensile strength of 635MPa, an extension of 55.679% and an average micro hardness of HV307 for stainless steel powder. It is interesting to find that the phase of the built parts is also austenite by XRD, which is the same as that of the starting material.

scholarly journals Design and Synthesis of C-O Grain Boundary Strengthening of Al Composites

Nanomaterials ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 438
Author(s):  
Jianian Hu ◽  
Jian Zhang ◽  
Guoqiang Luo ◽  
Yi Sun ◽  
Qiang Shen ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Yield Strength ◽  
Grain Boundary ◽  
Pure Aluminum ◽  
Polyvinyl Butyral ◽  
Strengthening Mechanism ◽  
Vertical Tube ◽  
Al Matrix ◽  
Grain Boundary Strengthening

This research presents an approach for C-O grain boundary strengthening of Al composites that used an in situ method to synthesize a C-O shell on Al powder particles in a vertical tube furnace. The C-O reinforced Al matrix composites (C-O/Al composites) were fabricated by a new powder metallurgy (PM) method associated with the hot pressing technique. The data indicates that Al4C3 was distributed within the Al matrix and an O-Al solution was distributed in the grain boundaries in the strengthened structure. The formation mechanism of this structure was explained by a combination of TEM observations and molecular dynamic simulation results. The yield strength and ultimate tensile strength of the C-O/Al composites, modified by 3 wt.% polyvinyl butyral, reached 232.2 MPa and 304.82 MPa, respectively; compared to the yield strength and ultimate tensile strength of the pure aluminum processed under the same conditions, there was an increase of 124% and 99.3%, respectively. These results indicate the excellent properties of the C-O/Al-strengthened structure. In addition, the strengthening mechanism was explained by the Hall–Petch strengthening, dislocation strengthening, and solid solution strengthening mechanisms, which represented contributions of nearly 44.9%, 15.9%, and 16.6% to the total increased strength, respectively. The remaining increment was attributed to the coupled strengthening of the C and O, which contributed 20.6% to the total increase.

Vacuum Brazing of Copper Tubes Using Ag-Cu Filler

2013 ◽  
Vol 690-693 ◽  
pp. 2664-2667
Author(s):  
Rui Feng Li ◽  
Zhong Xing Shi ◽  
Kai Qi ◽  
Ming Fang Wu
Keyword(s):  
Mechanical Property ◽  
Tensile Strength ◽  
Tensile Test ◽  
Base Metal ◽  
Optical Microscope ◽  
Test Machine ◽  
Vacuum Level ◽  
Vacuum Brazing ◽  
Brazed Joints ◽  
Microstructure And Mechanical Property

Joining of copper tubes using Ag-Cu filler has been carried out by vacuum brazing technology. The microstructure and mechanical property of brazed joints were studied by means of metallography, optical microscope (OM) and universal tensile test machine. Experimental results show that failure occurs in the base metal and the tensile strength can reach 179 MPa. The optimal vacuum brazing parameters are: brazing temperature 820 °C, vacuum level 10-3Pa and holding time 5 min.

Research on Microstructure and Mechanical Property of the Production of Al-Si Alloy by Electric Warming

2010 ◽  
Vol 146-147 ◽  
pp. 661-665
Author(s):  
Niu Can Liu ◽  
Jun Qing Li ◽  
Zhong Xia Liu
Keyword(s):  
Mechanical Property ◽  
Tensile Strength ◽  
Commercial Production ◽  
Quartz Plate ◽  
Fe Content ◽  
Plate Filter ◽  
Microstructure And Mechanical Property

Adopting quartz plate filter of 20 mesh to filter the ZL102 alloy compounded by Al-30Si coarse alloy produced by electric warming, the Fe content in the alloy is reduced to 0.43% from 1.14%, the big massive and petaloid Fe phase becomes fine block-like. The tensile strength and elongation of the alloy arrive at 182MPa and 4.3% respectively, which increased by 38% and 290% separately compared with the alloy without filtration. The mechanical property of this alloy has been close to the alloy compounded by pure Al and it can fully meet the demand of commercial production.

Microstructure and Mechanical Property of 22MnB5 High-Strength Steel

2013 ◽  
Vol 864-867 ◽  
pp. 644-647
Author(s):  
Ao Ran Wei ◽  
Hong Wei Liu ◽  
Jing Fan Chen
Keyword(s):  
Heat Treatment ◽  
Mechanical Property ◽  
Tensile Strength ◽  
High Strength Steel ◽  
Lath Martensite ◽  
High Strength ◽  
22Mnb5 Steel ◽  
Specific Elongation ◽  
Microstructure And Mechanical Property ◽  
Better Than

We have mental heat treatment for 22MnB5 steel with seven different experimental schemes and have mechanical property test on the seven steels. Then the microstructure and mechanical property of treated steels are studied, and the results show that 300°C is the optimum preservation temperature, at which we can get the optimum specific elongation of 22MnB5 steel. The tensile strength of steel thermal insulated at 300°C for 3 minutes is better than that of steel tempered at 300°C for 3 minutes, while as for specific elongation , the latter one is better. And we can also get homogeneous lath martensite after die quenching. The experiment lays foundations of the actual production process of hot forming.

scholarly journals Strategies to Achieve High Strength and Ductility of Pulsed Electrodeposited Nanocrystalline Co-Cu by Tuning the Deposition Parameters

Molecules ◽  
2020 ◽  
Vol 25 (21) ◽  
pp. 5194
Author(s):  
Killang Pratama ◽  
Christian Motz
Keyword(s):  
Tensile Strength ◽  
Current Density ◽  
Duty Cycle ◽  
Pulse Current ◽  
High Strength ◽  
Internal Stresses ◽  
Low Duty Cycle ◽  
Deposition Parameters ◽  
Pulse On Time ◽  
Strength And Ductility

Strategies to improve tensile strength and ductility of pulsed electrodeposited nanocrystalline Co-Cu were investigated. Parameters of deposition, which are pulse current density, duty cycle, and pulse-on time were adjusted to produce nanocrystalline Co-Cu deposits with different microstructures and morphologies. The most significant improvement of strength and ductility was observed at nanocrystalline Co-Cu deposited, at a low duty cycle (10%) and a low pulse-on time (0.3 ms), with a high pulse current density (1000 A/m2). Enhancement of ductility of nanocrystalline Co-Cu was also obtained through annealing at 200 °C, while annealing at 300 °C leads to strengthening of materials with reduction of ductility. In the as deposited state, tensile strength and ductility of nanocrystalline Co-Cu is strongly influenced by several factors such as concentration of Cu, grain size, and processing flaws (e.g., crystal growth border, porosity, and internal stresses), which can be controlled by adjusting the parameters of deposition. In addition, the presence of various microstructural features (e.g., spinodal and phase decomposition), as well as recovery processes induced by annealing treatments, also have a significant contribution to the tensile strength and ductility.

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