Effects of Y on the Microstructure and Mechanical Properties of Mg-Zn-Y-Zr Magnesium Alloys

2017 ◽  
Vol 904 ◽  
pp. 29-35
Author(s):  
Da Yu Wang ◽  
Zhi Ming Du ◽  
Hong Juan Zhang ◽  
Li Hua Chen ◽  
Chang Shun Wang
Keyword(s):  
Mechanical Property ◽  
Grain Refinement ◽  
Mass Fraction ◽  
Atomic Ratio ◽  
Extension Rate ◽  
Precipitated Phase ◽  
Mold Casting ◽  
Alloy Increase ◽  
Test Result ◽  
Zr Alloys

Mg-Zn-Zr-Y billets with different mass fraction of Y (wt%(Y)=0.2%、0.5%、1.0%、1.5%、2.0%) was prepared by permanent mold casting. The increase in Y content has shown grain refinement effects on the microstructure morphologies of Mg–Zn–Y–Zr alloys. When the content of Y achieves 1.0 wt%, the grain refinement effect of the Y is most obvious than any more contents of the Y content. In the test result of XRD, the type of precipitated phase in Mg-Zn-Zr-Y alloys is related to atomic ratio of Y/Zn. With content of Y increases, atomic ratio of Y/Zn increases,the precipitated phase in alloy is changed from Phase I to Phase W. Tensile strength and extension rate of alloy increase with the increasing of Y content; When Y content reaches 1.0%, mechanical property reaches maximum value.When content of Y exceeds 1.0%, with the increasing of Y content, mechanical property of alloy declines gradually.

Effect of Composite Master Alloy on Mechanical Properties and Electrochemical Corrosion of ZL101 Alloy

2013 ◽  
Vol 749 ◽  
pp. 407-413
Author(s):  
Hong Xu ◽  
Xin Zhang ◽  
Ji Ping Ren ◽  
Min Peng ◽  
Shi Yang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Tensile Strength ◽  
Grain Refinement ◽  
Master Alloy ◽  
Mass Fraction ◽  
Electrochemical Corrosion ◽  
Corrosion Performance ◽  
Obvious Effect ◽  
Mechanical Properties And Corrosion

The mechanical properties and corrosion performances of the ZL101 alloy modified by the composite master alloy were investigated. The results showed that the master alloy had not only obvious effect of grain refinement, but also a significant role in refining dendrite grain of ZL101 alloy. The grain size decreased dramatically from 150μm to 62μm when the addition of composite master alloy is up to 0.5%(mass fraction) and the temperature is 720 for 30 minutes,. Its tensile strength and elongation increased by 27% and 42% respectively. The grain refinement of ZL101 alloy decreased its corrosion performance. The morphology of Si changed into globular from needle modified by NaF, instead of AlTiB.

scholarly journals Evaluation of Grain Refinement and Mechanical Property on Friction Stir Welded Inconel 600

2009 ◽  
Vol 50 (4) ◽  
pp. 832-836 ◽  
Author(s):  
Kuk Hyun Song ◽  
Hidetoshi Fujii ◽  
Kazuhiro Nakata
Keyword(s):  
Mechanical Property ◽  
Grain Refinement ◽  
Inconel 600 ◽  
Friction Stir

scholarly journals Atom Probe Tomographic Studies of Precipitation in Al-0.1Zr-0.1Ti (at.%) Alloys

2007 ◽  
Vol 13 (6) ◽  
pp. 503-516 ◽  
Author(s):  
Keith E. Knipling ◽  
David C. Dunand ◽  
David N. Seidman
Keyword(s):  
Atom Probe Tomography ◽  
Local Thermodynamic Equilibrium ◽  
Atom Probe ◽  
Atomic Ratio ◽  
Chemical Compositions ◽  
Ti Alloys ◽  
The Matrix ◽  
Solute Atoms ◽  
Interfacial Segregation ◽  
Zr Alloys

Atom probe tomography was utilized to measure directly the chemical compositions of Al3(Zr1−xTix) precipitates with a metastable L12 structure formed in Al-0.1Zr-0.1Ti (at.%) alloys upon aging at 375°C or 425°C. The alloys exhibit an inhomogeneous distribution of Al3(Zr1−xTix) precipitates, as a result of a nonuniform dendritic distribution of solute atoms after casting. At these aging temperatures, the Zr:Ti atomic ratio in the precipitates is about 10 and 5, respectively, indicating that Ti remains mainly in solid solution rather than partitioning to the Al3(Zr1−xTix) precipitates. This is interpreted as being due to the very small diffusivity of Ti in α-Al, consistent with prior studies on Al-Sc-Ti and Al-Sc-Zr alloys, where the slower diffusing Zr and Ti atoms make up a small fraction of the Al3(Sc1−xTix/Zrx) precipitates. Unlike those alloys, however, the present Al-Zr-Ti alloys exhibit no interfacial segregation of Ti at the matrix/precipitate heterophase interface, a result that may be affected by a significant disparity in the evaporation fields of the α-Al matrix and Al3(Zr1−xTix) precipitates and/or a lack of local thermodynamic equilibrium at the interface.

scholarly journals Improving Mechanical Property and Microstucture Evolution of 7075 Aluminum Panel Formed by Unequal Alternate Double-sided Laser Shock Forming

2021 ◽  
Author(s):  
Yuqi Yang ◽  
Hongchao Qiao ◽  
Ying Lu ◽  
Jibin Zhao ◽  
boyu sun ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Grain Refinement ◽  
High Strain ◽  
Weight Ratio ◽  
Strengthening Mechanism ◽  
Dislocation Slip ◽  
Laser Shock ◽  
Laser Shock Forming ◽  
Laser Shock Wave

Abstract With thrust weight ratio increasing, integral panel is an important component to reduce the aircraft weight, and it is a great challenges to ensure the forming accuracy and mechanical property in the lager-scale panel. Laser shock forming has a great development prospect in achieving integral panel forming and improving its mechanical properties. This work investigated unequal alternate double-sided laser shock forming, which can make 7075 aluminum panel form and induce harden layer in both panel sides. The improvement in mechanical properties and microstucture evolution of 7074 aluminum panel were analyzed after unequal alternate double-sided laser shock forming. The residual stress and microhardness in surface and subsurface were verified to be enhanced by the laser shock wave. The results of XRD and EBSD provided an evidence of grain refinement. The strengthening mechanism of unequal alternate double-sided laser shock forming was analyzed in this work. The grains are distorted and refined during high strain rate plastic deformation due to dislocation slip and accumulation. The mechanical properties were enhanced by unequal alternate double-sided laser shock forming for harden layers in both panel sides. The harden layers and grain refinement has a great significance in inhibiting the crack generation and growth.

Decreasing Defects of Center Porosity and Improving Secondary Pipe Castings for Superalloy Ingots by Dynamics Methods

2016 ◽  
Vol 849 ◽  
pp. 526-530
Author(s):  
Chao Wang ◽  
Zhen Rui Li ◽  
Yong Ji Niu ◽  
Shi Feng Shi ◽  
Ning An
Keyword(s):  
Grain Refinement ◽  
Influence Factors ◽  
Typical Application ◽  
Advantages And Disadvantages ◽  
Dynamic Methods ◽  
Application Methods ◽  
Test Result ◽  
Working Parameter ◽  
Center Porosity ◽  
Production Situation

The causes and the influence factors of the defects of center porosity and secondary pipe of the casting superalloy ingot are briefly introduced, and the study on the principle and technical characters of grain refinement technology with dynamic methods carried out. The mechanism, working parameter and the test result of the typical application methods including the technologies of vibration of ultrasonic, the vibration of mould, the stir of mould and oscillation in the riser were investigated in detail. By comparing the advantages and disadvantages of different methods and also according to the practical production situation of our company, the most appropriate one for improving the defects of center porosity and secondary pipe is proposed.

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