Grain Boundary Feature and Its Effect on Mechanical Property of Ni 690 Alloy Layer Produced by GTAW

2018 ◽  
pp. 131-144
Author(s):  
Wangteng Lin ◽  
Xiao Wei ◽  
Shaofeng Yang ◽  
Yuqian Huang ◽  
Maolong Zhang ◽  
...  
Keyword(s):  
Mechanical Property ◽  
Grain Boundary ◽  
Alloy Layer

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.

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.

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.

411 Mechanical Property Evaluation of Grain Boundary by Indentation and Crystal Plasticity Simulation

2012 ◽  
Vol 2012.48 (0) ◽  
pp. 126-127
Author(s):  
Yoshiteru AOYAGI ◽  
Sho SAKUMA ◽  
Osamu TAKAKUWA ◽  
Hitoshi SOYAMA
Keyword(s):  
Mechanical Property ◽  
Grain Boundary ◽  
Crystal Plasticity ◽  
Property Evaluation

Double Annealing Processes of Ti-5Al-5Mo-5V-1Cr-1Fe Titanium Alloy

2019 ◽  
Vol 944 ◽  
pp. 33-37
Author(s):  
Qing Rui Wang ◽  
Ai Xue Sha ◽  
Li Jun Huang ◽  
Xing Wu Li ◽  
Guang Bao Mi
Keyword(s):  
Mechanical Property ◽  
Titanium Alloy ◽  
Phase Transformation ◽  
Grain Boundary ◽  
Annealing Temperature ◽  
Small Deformation ◽  
Annealing Process ◽  
Air Cooling ◽  
Large Size ◽  
Comprehensive Property

In this work, double annealing processes of Ti-5Al-5Mo-5V-1Cr-1Fe titanium alloy were systemically investigated, and the microstructure and property of different processes were compared. The results show that, when the first stage annealing is air cooling, the microstructure with continuous and straight grain boundary is obtained, and corresponding mechanical property is not very good; When the first stage annealing is furnace cooling, the influence of first stage annealing temperature on microstructure and property is obvious. Excellent comprehensive property can be obtained when β grain boundary and a phase are discontinuous and tortuous. Further, based on this research, a new double annealing process is developed, which can obtain excellent ductility when large size forging is fabricated above the phase transformation point and has small deformation.

Microstructures and Mechanical Properties of Si and Sb Added Mg Alloy

2010 ◽  
Vol 44-47 ◽  
pp. 2809-2813 ◽  
Author(s):  
Yong Hu ◽  
Li Rao ◽  
Hong Yan
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Magnesium Alloy ◽  
Grain Boundary ◽  
Phase Changes ◽  
Chinese Script ◽  
Mg2si Phase ◽  
Grain Sizes ◽  
Polygonal Shape ◽  
Si Addition

The effect of Si and Sb on the microstructure and mechanical properties of AM60 magnesium alloy has been studied. The results indicate that Si addition introduces Chinese script type Mg2Si phase at the grain boundary and increases the ultimate tensile property and hardness except the elongation of AM60 magnesium alloy. The Chinese script type Mg2Si phase changes to a fine polygonal shape and the grain sizes decreases by addition Sb. Sb addition increases the mechanical property of the alloy.

Research on the Microstructure and Mechanical Property of Ti-7Cu Alloy after Semi-Solid Forging

2016 ◽  
Vol 35 (6) ◽  
pp. 543-550 ◽  
Author(s):  
Yongnan Chen ◽  
Yazhou Huo ◽  
Yongqing Zhao ◽  
Zhiping Sun ◽  
Fan Bai
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Grain Size ◽  
Solid State ◽  
Grain Boundary ◽  
Dynamic Recrystallization ◽  
Precipitation Behavior ◽  
Semi Solid ◽  
Solid Forging ◽  
Microstructure And Mechanical Property

AbstractThe present work is focused on the development of microstructure of Ti-7Cu alloy as a function of forging temperature and forging ratio in semi-solid state and the influence of resulting microstructure on the mechanical properties. The experimental results showed that the dynamic recrystallization occurred during semi-solid forging and the grain refinement was attained which is considered to be favorable for improving the semi-solid formability. The grain size increased with forging temperature and decreased with forging ratio. Forging temperature has a significant effect on the precipitation behavior in grain boundary regions during the semi-solid processing. More acicular-Ti2Cu tended to precipitate in grain boundary regions with higher forging temperature and finally formed precipitates zones adjacent to grain boundaries after forged at 1,100°C. High ultimate tensile strengths and low elongation have been achieved after semi-solid forging. The strength and hardness decreased with increase of forging temperature, while the ductility increased with increase of forging ratio. The relative contributions of tensile properties were attributed to the varieties of grain size and the distribution of Ti2Cu precipitates obtained by semi-solid forging.

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