scholarly journals The Influence of Directly Plating Time on the Structure of Electroless Nickel on AZ91

2021 ◽  
pp. X
Author(s):  
Xiuzhi ZHANG ◽  
Yingjie LI
Keyword(s):  
Grain Size ◽  
Magnesium Alloy ◽  
Deposition Time ◽  
Interplanar Spacing ◽  
Electroless Nickel ◽  
Test Machine ◽  
Az91 Magnesium Alloy ◽  
Az91 Magnesium ◽  
Composition Structure ◽  
The Right

In this paper, the influence of deposition time on the surface morphology, composition, structure, grain size and hardness of electroless nickel plated directly in neutral pH bath on AZ91 magnesium alloy are discussed by using SEM, EDS, XRD and microhardness test machine measurements. The results show that with the increasement of the plating time, the surface tends to be smooth, dense, and complete. The coating is composed of Ni and P and the content of P increases with the increasing the plating time. Furthermore, the XRD peaks for the coatings shift to the right and broaden gradually with prolonged plating time, which indicates that the interplanar spacing of the crystal and the grain size are simultaneously decreased. At the same time, the microhardness of the samples is also increased with increasing plating time.

Influence of MnCO3 Addition on the Grain Refinement of AZ91 Magnesium Alloy

2014 ◽  
Vol 703 ◽  
pp. 56-59
Author(s):  
Xiao Ying Liu ◽  
Hao Ran Geng ◽  
Min Zuo ◽  
Peng Fei Ji
Keyword(s):  
Grain Size ◽  
Magnesium Alloy ◽  
Grain Refinement ◽  
Az91 Alloy ◽  
Grain Refining ◽  
Az91 Magnesium Alloy ◽  
Refinement Efficiency ◽  
Az91 Magnesium ◽  
Resistance Performance ◽  
Addition Amount

This article reports the effect of MnCO3addition on the grain refinement efficiency of AZ91 magnesium alloy. The results indicate that the addition of MnCO3has excellent grain refining efficiency for AZ91 alloy, which is mainly attributed to the Al4C3particles formed in the melt, besides Mn is indispensable to grain refinement in Al-bearing magnesium alloys. There is an optimal addition amount of 0.6% at 740 °C and the grain size is reduced from 245 to 91 μm. At the same time, the corrosion resistance performance of MnCO3-added AZ91is improved.

scholarly journals Effects of Sb Content on Solidification Pathways and Grain Size of AZ91 Magnesium Alloy

2014 ◽  
Vol 28 (1) ◽  
pp. 115-121 ◽  
Author(s):  
Dan-Hui Hou ◽  
Song-Mao Liang ◽  
Rong-Shi Chen ◽  
Chuang Dong ◽  
En-Hou Han
Keyword(s):  
Grain Size ◽  
Magnesium Alloy ◽  
Az91 Magnesium Alloy ◽  
Az91 Magnesium

Effects of Strontium and Calcium on the Microstructure and Grain Size of Cast AZ91 Magnesium Alloy

2011 ◽  
Vol 264-265 ◽  
pp. 789-794
Author(s):  
A. Kiani ◽  
M. Emamy ◽  
E. Fadaei ◽  
Saber Ghannadi
Keyword(s):  
Grain Size ◽  
Electron Microscope ◽  
Magnesium Alloy ◽  
Scanning Electron Microscope ◽  
Phase Distribution ◽  
Optical Microscope ◽  
Uniform Structure ◽  
Az91 Magnesium Alloy ◽  
Az91 Magnesium ◽  
Scanning Electron

The experiments focused on the influence of strontium and calcium as additional alloying elements on the grain size and phase distribution of AZ91 magnesium alloys. For this purpose, different concentrations of Sr (0.01, 0.1, 0.4, and 0.8) and Ca (0.01, 0.1, 0.4, 0.6 and 0.78) were added. The microsturctural examination of specimens was made by an optical microscope and scanning electron microscope. From obtained results it was found that using 0.4 wt% strontium can provide a fine and uniform structure.

Study on the Dynamic Recrystallization Critical Stress of AZ91 Magnesium Alloy

2013 ◽  
Vol 477-478 ◽  
pp. 1269-1272
Author(s):  
Gang Chen ◽  
Shun Qi Zheng ◽  
Juan Lv ◽  
Zhin Min Zhang
Keyword(s):  
Magnesium Alloy ◽  
Strain Hardening ◽  
Critical Stress ◽  
Strain Rate Range ◽  
Test Machine ◽  
Strain Rates ◽  
Compression Tests ◽  
Az91 Magnesium Alloy ◽  
Az91 Magnesium ◽  
Strain Hardening Rate

The true stress-strain curves of AZ91 magnesium alloy as-homogenized were studied with compression tests on Gleeble 3500 thermal simulated test machine at 200°C—400°C and strain rate range of 10-3S-1 — 5S-1. Critical recrystallization behavior of AZ91 magnesium alloy was investigated by using strain hardening rate. The relationship between critical stress of dynamic revrystallization and temperatures and strain rates is determined by the curves between strain hardening rate and flow stress. According to the irreversible principles of thermo dynamics, the critical stresses at different temperatures and strain rates are calculated by two derivative of θ—σ curves. The map of the critical stress-temperatures-strain rates is established.

Effect of Processing Parameters on Thermo-Mechanically Affected Zone of Friction Stir Processed AZ91 Magnesium Alloy

2010 ◽  
Author(s):  
M. Taherishargh ◽  
N. Parvin ◽  
P. Asadi
Keyword(s):  
Grain Size ◽  
Magnesium Alloy ◽  
Friction Stir Processing ◽  
Rotational Speed ◽  
Traverse Speed ◽  
Processing Parameters ◽  
The Other ◽  
Az91 Magnesium Alloy ◽  
Friction Stir ◽  
Az91 Magnesium

AZ91 Magnesium alloy was subjected to friction stir processing (FSP). The microstructural analyses of the friction stir processed (FSPed) specimens were carried out and the effects of pass number, rotational speed, and traverse speed upon thermo-mechanically affected zone (TMAZ) were investigated. The TMAZ is consisted of a region with highly elongated grains and a partially recrystalized zone. Decreasing the rotational speed and increasing the traverse speed increased the thickness of recrystallized zone; while, the thickness of the other zone decreased. On the other hand, it lessened the gradient of the grain size from the stir zone (SZ) to the base metal. Applying several FSP passes, lead to more homogeneous TMAZ structure with the finer grain size.

Effects of the drill flute number on drilling of a casted AZ91 magnesium alloy

2019 ◽  
Vol 61 (3) ◽  
pp. 260-266 ◽  
Author(s):  
Ugur Koklu ◽  
Sezer Morkavuk ◽  
Levent Urtekin
Keyword(s):  
Magnesium Alloy ◽  
Az91 Magnesium Alloy ◽  
Az91 Magnesium
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