Effect of Sc, Zr Grain Refiner on the Microstructure and Mechanical Properties of Pure Aluminum

2014 ◽  
Vol 508 ◽  
pp. 16-21 ◽  
Author(s):  
Ai Wu Yu ◽  
Cheng Gang Yang ◽  
Shang Lin Wang ◽  
Fen Cheng Liu ◽  
Qiang Zheng
Keyword(s):  
Mechanical Properties ◽  
Pure Aluminum ◽  
Eutectic Point ◽  
Strengthening Effect ◽  
Grain Refiner ◽  
Solid Solution Strengthening ◽  
Fine Grain ◽  
Microstructure And Mechanical Properties ◽  
Average Grain Size ◽  
Columnar Grains

The influence of grain refiner on the microstructure and mechanical properties of pure aluminum was investigated by separate and combined addition trace ScZr elements. The results show that the grain refinement effect of 0.2%Zr added alone is better than that of 0.2%Sc, each of them separate addition can make the strength and hardness of alloys increased obviously, and the decrease of the ductility is not remarkable, but the hardness increase of the alloy with 0.2%Sc is more significant than 0.2%Zr because of the strongly solid solution strengthening of Sc. While, the combined addition of 0.2%Sc and 0.2%Zr possesses the most excellent grain refining effect and change the growth morphology from columnar grains to equiaxed ones, the average grain size of the alloy is dropped to only about 100μm, and the strength, plastic and hardness of the alloy meet the reasonable matching, which is largely attributed to the effectively reduce of the Al-Sc eutectic point and the formation of Al3(Sc, Zr) composite particles, These Al3(Sc, Zr) particles can not only keep all the beneficial effect of A13Sc but can act as extremely effective nucleation sites of α (Al) and cause strongly fine-grain strengthening effect.

Microstructure and Mechanical Properties of Quasicrystal Reinforced Magnesium Matrix Composites

2011 ◽  
Vol 686 ◽  
pp. 242-246
Author(s):  
Xu Dong Wang ◽  
Wen Bo Du ◽  
Chao Hui Wang ◽  
Shu Bo Li
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Maximum Yield ◽  
Icosahedral Quasicrystal ◽  
Strengthening Effect ◽  
Magnesium Matrix Composites ◽  
Fine Grain ◽  
Average Grain Size ◽  
The Matrix ◽  
Maximum Yield Strength

Magnesium-based composites reinforced with stable icosahedral quasicrystal particles have been fabricated via Repeated Plastic Working (RPW) process. The microstructure of the composites has been investigated by XRD, SEM, TEM and HREM, and its mechanical properties have also been studied. The results showed that the RPW process could reduce the matrix grain size significantly, and the average grain size of matrix was only about 500 nm after 200 cycles of RPW. A good metallurgical bond interface between the quasicrystal particles and the Mg matrix was found. The composites exhibited the maximum yield strength of 265MPa and the maximum ultimate tensile strength of 309MPa at room temperature, respectively. The enhancement of mechanical properties is attributed to the strengthening effect of the quasicrystal particles and the fine-grain size of matrix.

Effect of Ti and Zr Composite Refiner on Microstructure and Tensile Properties of Pure Aluminum

2014 ◽  
Vol 1056 ◽  
pp. 47-51
Author(s):  
Ai Wu Yu ◽  
Cheng Gang Yang ◽  
Peng He ◽  
He Chen
Keyword(s):  
Grain Size ◽  
Tensile Strength ◽  
Tensile Properties ◽  
Pure Aluminum ◽  
Grain Refining ◽  
Growth Morphology ◽  
Grain Refiner ◽  
Refining Effect ◽  
Average Grain Size ◽  
Columnar Grains

This study investigated the influence of Ti and Zr grain refiner on the microstructure and tensile properties of pure aluminum. The results show that Ti and Zr composite refiner exhibit better grain-refining effect than that of Ti or Zr added alone, only adding 0.15%Ti and 0.15%Zr can positively refine the grain size and change the growth morphology from columnar grains to fine equiaxed ones. When composite adding 0.5%Ti and 0.3%Zr, the tensile strength of the alloy is increased from 43.5MPa of pure aluminum to 84.4 MPa and the average grain size is reduced to only about 62μm.

Effect of Cooling Rate on the Microstructure and Mechanical Properties of ZK60 Alloy

2007 ◽  
Vol 546-549 ◽  
pp. 319-322 ◽  
Author(s):  
Jin Bao Lin ◽  
Qu Dong Wang ◽  
Li Ming Peng ◽  
Yang Zhou ◽  
Wen Jiang Ding
Keyword(s):  
Mechanical Properties ◽  
Yield Strength ◽  
Cooling Rate ◽  
Casting Process ◽  
Strengthening Effect ◽  
Element Analysis ◽  
Fine Grain ◽  
Microstructure And Mechanical Properties ◽  
Zk60 Alloy ◽  
Fea Simulation

Microstructure and mechanical properties of Mg-6.0wt%Zn-0.5wt%Zr (ZK60) alloy were studied as a function of cooling rate. The temperature field and cooling rate during the casting process were investigated by use of finite element analysis (FEA) simulation. The results showed that the microstructure was refined and the eutectic phase distributed much uniformly with the increase of cooling rate. The increase of yield strength, ultimate strength and elongation can be ascribed to the strengthening effect of fine grain. Relationship between grain size and yield strength is consistent with the Hall-Petch formalism: 1/ 2 80.37 132.56 − = + d y σ .

Microstructure and Mechanical Properties of Backward-Extruded Mg-Zn-xCa Biomaterials

2013 ◽  
Vol 747-748 ◽  
pp. 426-430
Author(s):  
Xue Jun Li ◽  
Hui Li ◽  
Shuang Shuang Zhao ◽  
Ning Ma ◽  
Qiu Ming Peng
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Solid Solution Strengthening ◽  
Backward Extrusion ◽  
Fine Grain ◽  
Fine Grain Strengthening ◽  
Microstructure And Mechanical Properties ◽  
Solution Strengthening ◽  
Extrusion Technology ◽  
Precipitate Strengthening

The Mg-1.0Zn-xCa (x=0.2, 0.5, 0.8, 1 wt. %) alloys were prepared by zone solidification and backward extrusion technology. The microstructure and mechanical properties of backward-extruded Mg-1.0Zn-xCa alloys were investigated. The results showed that these backward-extruded Mg-1.0Zn-xCa alloys were mainly composed of equi-axed pentagon-shaped grains and some Mg0.9Zn0.03 precipitates. The tensile and compressive strengths of backward-extruded Mg-1.0Zn-xCa alloys were greatly improved. The improved mechanical properties are mostly attributed to fine grain strengthening, solid solution strengthening and precipitate strengthening. The results demonstrated that the micro alloying of Ca element was one of effective method to improve the mechanical properties of Mg-1.0Zn based biomaterials.

scholarly journals Development of Al–Mg–Si alloy performance by addition of grain refiner Al–5Ti–1B alloy

2021 ◽  
Vol 104 (2) ◽  
pp. 003685042110294
Author(s):  
Khaled Abd El-Aziz ◽  
Emad M Ahmed ◽  
Abdulaziz H Alghtani ◽  
Bassem F Felemban ◽  
Hafiz T Ali ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Corrosion Resistance ◽  
Testing Machine ◽  
Dendritic Structure ◽  
Grain Refiner ◽  
Corrosion Properties ◽  
Average Grain Size ◽  
Structural Applications ◽  
Alloy Addition

Aluminum alloys are the most essential part of all shaped castings manufactured, mainly in the automotive, food industry, and structural applications. There is little consensus as to the precise relationship between grain size after grain refinement and corrosion resistance; conflicting conclusions have been published showing that reduced grain size can decrease or increase corrosion resistance. The effect of Al–5Ti–1B grain refiner (GR alloy) with different percentages on the mechanical properties and corrosion behavior of Aluminum-magnesium-silicon alloy (Al–Mg–Si) was studied. The average grain size is determined according to the E112ASTM standard. The compressive test specimens were made as per ASTM: E8/E8M-16 standard to get their compressive properties. The bulk hardness using Vickers hardness testing machine at a load of 50 g. Electrochemical corrosion tests were carried out in 3.5 % NaCl solution using Autolab Potentiostat/Galvanostat (PGSTAT 30).The grain size of the Al–Mg–Si alloy was reduced from 82 to 46 µm by the addition of GR alloy. The morphology of α-Al dendrites changes from coarse dendritic structure to fine equiaxed grains due to the addition of GR alloy and segregation of Ti, which controls the growth of primary α-Al. In addition, the mechanical properties of the Al–Mg–Si alloy were improved by GR alloy addition. GR alloy addition to Al–Mg–Si alloy produced fine-grained structure and better hardness and compressive strength. The addition of GR alloy did not reveal any marked improvements in the corrosion properties of Al–Mg–Si alloy.

scholarly journals Effect of Sm Doping on the Microstructure, Mechanical Properties and Shape Memory Effect of Cu-13.0Al-4.0Ni Alloy

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 4007
Author(s):  
Qimeng Zhang ◽  
Bo Cui ◽  
Bin Sun ◽  
Xin Zhang ◽  
Zhizhong Dong ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Strengthening Effect ◽  
Face Centered Cubic ◽  
Compressive Fracture ◽  
Fine Grain ◽  
Fine Grain Strengthening ◽  
Face Centered

The effects of rare earth element Sm on the microstructure, mechanical properties, and shape memory effect of the high temperature shape memory alloy, Cu-13.0Al-4.0Ni-xSm (x = 0, 0.2 and 0.5) (wt.%), are studied in this work. The results show that the Sm addition reduces the grain size of the Cu-13.0Al-4.0Ni alloy from millimeters to hundreds of microns. The microstructure of the Cu-13.0Al-4.0Ni-xSm alloys are composed of 18R and a face-centered cubic Sm-rich phase at room temperature. In addition, because the addition of the Sm element enhances the fine-grain strengthening effect, the mechanical properties and the shape memory effect of the Cu-13.0Al-4.0Ni alloy were greatly improved. When x = 0.5, the compressive fracture stress and the compressive fracture strain increased from 580 MPa, 10.5% to 1021 MPa, 14.8%, respectively. When the pre-strain is 10%, a reversible strain of 6.3% can be obtained for the Cu-13.0Al-4.0Ni-0.2Sm alloy.

Microstructure and Mechanical Properties of Mg-6Zn-1.4Y Alloy Produced by Rheo-Squeeze Casting Process

2016 ◽  
Vol 879 ◽  
pp. 530-535
Author(s):  
Xiao Gang Fang ◽  
Shu Sen Wu ◽  
Shu Lin Lü
Keyword(s):  
Mechanical Properties ◽  
Power Density ◽  
Squeeze Casting ◽  
Casting Process ◽  
Acoustic Power ◽  
Icosahedral Quasicrystal ◽  
Microstructure And Mechanical Properties ◽  
Average Grain Size ◽  
Grain Size And Shape ◽  
Semi Solid

Mg-Zn-Y alloys containing a thermally stable icosahedral quasicrystal phase (I-phase) will have wide application future on condition that primary α-Mg dendrite and the I-phase can be refined during the casting process. In this research, the microstructure and mechanical properties of the rheo-squeeze casting (RSC) Mg-6Zn-1.4Y alloys have been investigated. The Mg alloy melt was exposed to ultrasonic vibration (USV) with different acoustic power densities from 0 W/mL to 9 W/mL, and then the slurry was formed by squeeze casting. The results show that good semi-solid slurry with fine and spherical α-Mg particles could be obtained with the acoustic power density of 6 W/mL, and the average grain size and shape factor of primary α-Mg were 32 μm and 0.76, respectively. Meanwhile the coarse eutectic I-phase (Mg3Zn6Y) was refined obviously and dispersed uniformly. Compared with the samples without USV, the tensile strength and elongation of the RSC casting samples with 6 W/mL acoustic power density were elevated by 10.6% and 55.5%, respectively.

Effects of Welding Wire Composition on Microstructure and Mechanical Properties of Welded Joint in Al-Mg-Si Alloy

2022 ◽  
Vol 905 ◽  
pp. 44-50
Author(s):  
Li Wang ◽  
Ya Ya Zheng ◽  
Shi Hu Hu
Keyword(s):  
Mechanical Properties ◽  
Fusion Zone ◽  
Heat Affected Zone ◽  
Welded Joint ◽  
Weld Zone ◽  
Xrd Analysis ◽  
Metallographic Analysis ◽  
Strengthening Effect ◽  
Welding Wire ◽  
Microstructure And Mechanical Properties

The effects of welding wire composition on microstructure and mechanical properties of welded joint in Al-Mg-Si alloy were studied by electrochemical test, X-ray diffraction (XRD) analysis and metallographic analysis. The results show that the weld zone is composed of coarse columnar dendrites and fine equated grains. Recrystallized grains are observed in the fusion zone, and the microstructure in the heat affected zone is coarsened by welding heat. The hardness curve of welded joint is like W-shaped, the highest hardness point appears near the fusion zone, and the lowest hardness point is in the heat affected zone. The main second phases of welded joints are: matrix α-Al, Mg2Si, AlMnSi, elemental Si and SiO2. The addition of rare earth in welding wire can refine the grain in weld zone obviously, produce fine grain strengthening effect, and improve the electrochemical performance of weld.

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