Structure and Property of Nickel-Modified Ultrahigh Strength Al-Zn-Mg-Cu Alloy by Spray Forming

2007 ◽  
Vol 546-549 ◽  
pp. 871-876
Author(s):  
Zhen Liang Li ◽  
Jian Xin Xie ◽  
Wei Chen ◽  
Jing Zhai ◽  
Hui Ping Ren ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Spray Deposition ◽  
Spray Forming ◽  
Homogeneous Distribution ◽  
Structure And Property ◽  
Ultrahigh Strength ◽  
Cu Alloy ◽  
Cu Alloys ◽  
Ni Alloy ◽  
Properties Of Materials

Six kinds of Al-Zn-Mg-Cu alloys, modified with nickel and zirconium, have been produced by rapid solidification using spray deposition(the Osprey process). The effect of nickel on the structures, mechanical properties of ultrahigh strength aluminium alloy is studied, and the probable maximum of mechanical properties is predicted. There are three nickel-rich phases, Al3Ni2, Al7Cu4Ni and MgNi2, forming in 1%Ni alloy, its ultimate tensile strength(UTS) increased with increasing extrusion ratios significantly while maintaining high levels of ductility, Futhermore, the extruded bars show enhancing more clearly than extruded plates in UTS and ductility. The content of Ni should decreased with increasing of Zn and Zr, and the highest properties(UTS=832MPa, Elongation=7.5%)are attained in 0.20Zr＋0.30Ni (wt%)alloy. In addition, the size, the shape and the homogeneous distribution of zirconium-rich phase produced in solidification is the key to effecting the mechanical properties of materials when Zr content is 0.2~0.5％.

scholarly journals Effects of Excessive Zr Content and Ultrasonic Treatment on Microstructure and Mechanical Properties of Al-Zn-Mg-Cu Alloy

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 632
Author(s):  
Cheng Li ◽  
Shusen Wu ◽  
Shulin Lü ◽  
Jianyu Li ◽  
Longfei Liu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Ultrasonic Vibration ◽  
Ultrasonic Treatment ◽  
Second Phase ◽  
Cu Alloy ◽  
Cu Alloys ◽  
Microstructure And Mechanical Properties ◽  
Second Phase Particles ◽  
Properties Of Materials

The Zr element is one of the important grain refiners for 7xxx series Al-Zn-Mg-Cu alloys, but the effect of Zr content more than 0.15 wt.% needs to be deeply investigated under the action of ultrasonic vibration. In this study, the effects of Zr contents (0.1 to 0.25 wt.%) on microstructure and mechanical properties of Al-Zn-Mg-Cu alloy were studied. The results showed that Zr element could refine grains, but when the Zr content was greater than 0.15 wt.%, the grain size was not uniform, the number of second phase particles increased, and the segregation of components became more serious. It was found that after ultrasonic treatment, the grain-size inhomogeneity was greatly improved, and the Zr content could be added up to 0.2 wt.%. When the Zr content is equal or lower than 0.2 wt.%, ultrasonic treatment can effectively improve the mechanical properties of materials by refining grains and weakening segregation. However, when the Zr content is up to 0.25 wt.%, the effect is getting worse.

Mechanical and Corrosion Behaviors of the Casting Al-Cu Alloy Modified by Nano-Scale PrxOy and LaxOy

2015 ◽  
Vol 1120-1121 ◽  
pp. 1053-1058
Author(s):  
Hai Long Zhao ◽  
Wen Zhang ◽  
Chun Lin Zhang ◽  
Da Qian Sun ◽  
Xu Wang
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Fracture Strain ◽  
Electrochemical Corrosion ◽  
Nano Scale ◽  
Cu Alloy ◽  
Cu Alloys ◽  
Electrochemical Corrosion Behavior ◽  
Corrosion Behaviors ◽  
Mechanical Properties And Corrosion

The mechanical properties and corrosion behaviors of the casting Al-Cu alloys were investigated. The proportion of the two modifiers (PrxOy and LaxOy) has effects on the mechanical properties and the electrochemical corrosion behavior of the casting Al-Cu alloy. The ultimate true tensile strength of the Al-Cu alloy modified only by LaxOy is the highest (616.0 MPa). The fracture strain of the Al-Cu alloy modified by PrxOy and LaxOy is the highest (12.3%). The Al-Cu alloy modified by PrxOy has better corrosion resistance than any other Al-Cu alloy. The prominent mechanical properties should be attributed to the finer crystal grains and more homogeneously distributed nano-scale phase precipitates. The existence of continuous and compact protective Al2O3 and RE-O films enhanced the corrosion resistance of the modified Al-Cu alloy during the corrosion process.

Aging Behavior of Al-Cu Alloys Produced by Melt Extrusion Process

2006 ◽  
Vol 116-117 ◽  
pp. 550-553
Author(s):  
Byoung Soo Lee ◽  
Dae Heon Joo ◽  
Hoon Cho ◽  
Hyung Ho Jo ◽  
Myung Ho Kim
Keyword(s):  
Mechanical Properties ◽  
Extrusion Process ◽  
Semisolid State ◽  
Aging Behavior ◽  
Melt Extrusion ◽  
Cu Alloy ◽  
Cu Alloys ◽  
Metallic Melt ◽  
Mean Grain Size ◽  
The Mean

Melt extrusion is a new fabrication process with the characteristics of both casting and extrusion. In this process, a metallic melt which is poured and solidified up to semisolid state in the container can be directly extruded through the die exit to form a product of bar shape without other intermediate processes. The aging behavior of Al-Cu alloys in the semisolid state was investigated. And the microstructure and mechanical properties of the melt extruded Al-Cu alloy bar were measured and its characteristics are compared with those of a hot extruded Al-Cu alloy bar. Al-Cu alloys were successfully extruded after squeezing out of liquid during melt extrusion with smaller force compared to the solid extrusion. Al-Cu alloys bar with the mean grain size of up to 200 μm was fabricated by melt extrusion process. And the mechanical properties of the melt extruded Al-Cu alloy bar were improved after the T6 treatment.

Structure and Property of Sub-Zero Processed Cold Work Die Steel

2013 ◽  
Author(s):  
Debdulal Das ◽  
Kalyan K. Ray ◽  
Apurba K. Dutta
Keyword(s):  
Mechanical Properties ◽  
Cryogenic Treatment ◽  
Cold Work ◽  
Cold Treatment ◽  
Homogeneous Distribution ◽  
Tool Steels ◽  
Deep Cryogenic Treatment ◽  
Structure And Property ◽  
Conventional Heat Treatment ◽  
Processing Cycle

This study examines the influence of different sub-zero processing routes on microstructure and mechanical properties of a cold work tool steel. Incorporation of controlled sub-zero processing cycle in between hardening and tempering treatment of tool steels increases the amount of ultrafine carbide particles with improved homogeneous distribution in addition to reduction in retained austenite content; these modifications are found to be enhanced with decreasing lowest temperature of the sub-zero processing cycle. It has been demonstrated that with reference to conventional heat treatment, sub-zero processing moderately improves hardness and marginally reduces fracture toughness but substantially enhances wear resistance of the selected steel; the extent of variations, in general, increase in the order of cold treatment, shallow cryogenic treatment and deep cryogenic treatment. The relationships of microstructural modifications with the variations of mechanical properties of tool steels due to different sub-zero processing have been established.

Consolidation and Mechanical Properties of Near-Net-Shape Al-21 wt.% Si Component Fabricated by Plasma Spray Forming

2007 ◽  
Vol 119 ◽  
pp. 183-186 ◽  
Author(s):  
Soon Jik Hong ◽  
S. Patil ◽  
Chang Kyu Rhee ◽  
S. Seal
Keyword(s):  
Mechanical Properties ◽  
Plasma Spray ◽  
Room Temperature ◽  
Spray Forming ◽  
Homogeneous Distribution ◽  
Cast Material ◽  
Plasma Spray Forming ◽  
Fine Microstructure ◽  
Near Net Shape ◽  
Increased Strength

The microstructure and mechanical properties of Al-21 wt% Si components fabricated by plasma spray forming are analyzed. The microstructure of the plasma spry formed component showed a homogeneous distribution of fine Si particles embedded in the Al matrix. The grain size of α-Al varied between 200 to 500 nm and the size of the Si particles was about 50 to 100 nm in the plasma spray formed component. The room temperature tensile strength of the plasma spray formed component was 215 MPa with 0.5 % elongation, while for cast material, it was 130 MPa. Despite the porosities, the ultra-fine microstructure and homogeneous distribution of Si particles embedded in matrix are the foundation of the increased strength of the plasma spry formed component.

Deformation Behavior of Nanocrystalline Co-Cu Alloys

2009 ◽  
Vol 1224 ◽  
Author(s):  
Motohiro Yuasa ◽  
Hiromi Nakano ◽  
Kota Kajikawa ◽  
Takumi Nakazawa ◽  
Mamoru Mabuchi
Keyword(s):  
Mechanical Properties ◽  
High Hardness ◽  
Md Simulations ◽  
Dislocation Emission ◽  
Two Phase ◽  
Cu Alloy ◽  
Cu Alloys ◽  
Grain Boundary Characteristics ◽  
Dynamics Simulations ◽  
Boundary Characteristics

AbstractThree kinds of nanocrystalline Co-Cu alloys: a nanocrystalline Co-Cu alloy with nanoscale lamellar structure, a supersaturated solid solution Co-Cu alloy and a nanocrystalline two-phase Co-Cu alloy were processed by electrodeposition, and their mechanical properties were investigated at room temperature. These nanocrystalline Co-Cu alloys showed the high hardness and the low activation volume. The mechanical properties of the nanocrystalline Co-Cu alloys strongly depended on the grain boundary characteristics. Molecular dynamics simulations were performed in the two-phase nanocrystalline Co-Cu alloy to investigate the dislocation emission at the Co/Cu interface. The MD simulations showed that the stacking faults, which are generated by the intense geometrical strain at the Co/Cu interface, play an important role in the dislocation emission.

Microstructures and Mechanical Properties of Melt Extruded Al-Cu Alloys

2006 ◽  
Vol 116-117 ◽  
pp. 635-638
Author(s):  
Byoung Soo Lee ◽  
Dae Heon Joo ◽  
Myung Ho Kim
Keyword(s):  
Mechanical Properties ◽  
Extrusion Ratio ◽  
Semisolid State ◽  
Melt Extrusion ◽  
Melt Temperature ◽  
Cu Alloy ◽  
Cu Alloys ◽  
Metallic Melt ◽  
Mean Grain Size ◽  
The Mean

Melt extrusion is a new fabrication process with the characteristics of both casting and extrusion. In this process, a metallic melt which is poured and solidified up to semisolid state in the container can be directly extruded through the die exit to form a product of bar shape without other intermediate processes. The effects of various process parameters, such as melt temperature and extrusion ratio, on the extrusion behavior of Al-Cu alloys in the semisolid state were investigated. Mechanical properties of the melt extruded Al-Cu alloy were measured and its characteristics are compared with the microstructure and copper contents in the alloy. Al-Cu alloys were successfully extruded after squeezing out of liquid during the melt extrusion with smaller force (60 Mpa) compared to the solid extrusion. Al-Cu alloys bar with the mean grain size of 200 μm was fabricated by melt extrusion; however, the mechanical properties have nothing to do with the extrusion ratio. The squeezing out of liquid was get lead to the segregation of the alloys and was affect on the mechanical properties.

Development of Al-Fe-(Cu) Series Alloys for Aluminum Cables and the Related Annealing Behaviors

2018 ◽  
Vol 941 ◽  
pp. 937-942
Author(s):  
Hua Chen ◽  
Rong Kai Yang ◽  
Xiao Dong Wu ◽  
Yuan Yuan ◽  
Bing Zhang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Heat Treatment ◽  
Electrical Conductivity ◽  
Electron Backscattered Diffraction ◽  
Cu Alloy ◽  
Cu Alloys ◽  
Backscattered Electron ◽  
Ebsd Technique ◽  
Scanning Electron

In this work, Al-Fe-(Cu) alloys for aluminum cables were designed and the related annealing behaviors were discussed in detail to help understand the influence of processing and heat treatment on the electrical conductivity and mechanical properties of the studied alloys. The interaction between different solute elements was tracked by using hardness and electrical conductivity testing. The microstructure was investigated by using Electron Backscattered Diffraction (EBSD) technique, along with Scanning Electron Microscopy with Backscattered Electron Detector (BSE). The results show that the conductivities of Al-Fe-Cu alloy increased with the elongated annealing time, and reaches its maximum at 6 h, when annealed at temperatures from 275 °C to 375 °C. The addition of Fe to Al can strengthen the alloy and decrease its conductivity slightly, while the addition of Cu will influence the alloy conductivity significantly. The morphologies of precipitates will change with different amount of alloying elements as well.

Effect of the Cyclic Extrusion and Compression Processing on Microstructure and Mechanical Properties of Al-1%Cu Alloy

2018 ◽  
Vol 780 ◽  
pp. 93-97
Author(s):  
Walaa Abdelaziem ◽  
Atef Hamada ◽  
Mohsen Abdel-Naeim Hassan
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Cast Alloy ◽  
Surface Hardness ◽  
Grain Structure ◽  
Cu Alloy ◽  
Cu Alloys ◽  
Microstructure And Mechanical Properties ◽  
Elongation To Failure

The Simple Cyclic extrusion compression (SCEC) has been developed for producing Al-1%Cu alloys with fine microstructures and superior properties. SCEC method was applied for only two-passess.It was found that the grain structure was significantly reduced from 1500 μm to 100 μm after two passes of cyclic extrusion. The ultimate tensile strength and elongation to failure of as-cast alloy were 110 MPa and 12 %, respectively. However, the corresponding mechanical properties of the two pass CEC deformed alloy are 275 MPa and 35%, respectively. These findings ensure that a significant improvement in the grain structure has been achieved. In addition, cyclic extrusion deformation increased the surface hardness of the alloy by 50 % after two passes.

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