scholarly journals Gradient Microstructures and Mechanical Properties of Ti-6Al-4V/Zn Composite Prepared by Friction Stir Processing

Materials ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 2795
Author(s):  
Yuting Lv ◽  
Zihao Ding ◽  
Xueyan Sun ◽  
Lei Li ◽  
Gang Sha ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Electron Microscope ◽  
Friction Stir Processing ◽  
Atom Probe ◽  
Phase Region ◽  
Friction Stir ◽  
Β Phase ◽  
The Matrix ◽  
Potential Applications ◽  
Microstructures And Mechanical Properties

In this work, a biomedical Ti-6Al-4V (TC4)/Zn composite with gradient microstructures was successfully prepared by friction stir processing (FSP). The microstructures and mechanical properties of the composite were systematically studied using scanning electron microscope (SEM), X-ray diffractometer (XRD), transmission electron microscope (TEM), atom probe tomography (APT), and microhardness test. The results show that TC4/Zn composite can be successfully prepared, and gradient microstructures varying from coarse grain to nanocrystalline is formed from the bottom to the upper surface. During FSP, adding Zn can accelerate the growth of β phase region, and the grain size significantly increases with the increasing rotation rate. The grain combination is the main mechanism for grain growth of β phase region. The deformation mechanisms gradually change from dislocation accumulations and rearrangement to dynamic recrystallization from the bottom to the upper surface (1.5 mm–150 μm from the upper surface). The composite exhibits slightly higher microhardness compared with the matrix. This paper provides a new method to obtain a TC4/Zn composite with gradient surface microstructures for potential applications in the biomedical field.

Microstructures and Mechanical Properties of AA6061-T4 Composites Containing SiC and B4C Particles Fabricated by Friction Stir Processing

2020 ◽  
Vol 12 (4) ◽  
pp. 531-537 ◽  
Author(s):  
Hyun-Joon Park ◽  
Byung-Wook Ahn ◽  
Jae-Ha Kim ◽  
Jong-Gun Lee ◽  
Seung-Boo Jung
Keyword(s):  
Mechanical Properties ◽  
Electron Microscope ◽  
Friction Stir Processing ◽  
Vickers Hardness ◽  
Charpy Impact ◽  
Hardness Test ◽  
Charpy Impact Test ◽  
Ceramic Particles ◽  
Friction Stir ◽  
Microstructures And Mechanical Properties

AA6061-T4 composites containing SiC and B4C particles were fabricated by friction stir processing (FSP) with an SKD11 tool. The microstructures and mechanical properties of the composites were investigated with various test methods. With the inclusion of ceramic particles, refined grains in the stir zone (SZ) were observed using a scanning electron microscope (SEM) and tunneling electron microscope (TEM). Because the ceramic particles facilitated grain refinement in the SZ via the pinning effect, the SZ with the particles had a much smaller grain size than the SZ without the particles. Vickers hardness test, tensile test and Charpy impact test were conducted to evaluate the mechanical properties. Mechanical properties of the SZ with the ceramic particles were improved relative to those of the SZ without the particles. Vickers hardness (from 50 to 90 HV), tensile strength (from 117 to 253 MPa) and Charpy impact absorbed energy (from 4.2 to 5.6 J) of the SZ increased with the addition of ceramic particles.

scholarly journals Mg/ZrO2 Metal Matrix Nanocomposites Fabricated by Friction Stir Processing: Microstructure, Mechanical Properties, and Corrosion Behavior

2021 ◽  
Vol 9 ◽  
Author(s):  
Ke Qiao ◽  
Ting Zhang ◽  
Kuaishe Wang ◽  
Shengnan Yuan ◽  
Shengyi Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Electron Microscope ◽  
Grain Refinement ◽  
Friction Stir Processing ◽  
Biological Properties ◽  
Mg Alloy ◽  
Corrosion Properties ◽  
Metal Matrix Nanocomposites ◽  
Friction Stir ◽  
Average Grain Size

Magnesium (Mg) and its alloys have attached more and more attention because of their potential as a new type of biodegradable metal materials. In this work, AZ31/ZrO2 nanocomposites with good uniformity were prepared successfully by friction stir processing (FSP). The scanning electron microscope (SEM) and transmission electron microscope (TEM) were used to characterize the microstructure of the composites. The mechanical properties, electrochemical corrosion properties and biological properties were evaluated. In addition, the effect of reinforced particles (ZrO2) on the microstructure and properties of the composite was studied comparing with FSP AZ31 Mg alloy. The results show that compared with the base metal (BM), the AZ31/ZrO2 composite material achieves homogenization, densification, and grain refinement after FSP. The combination of dynamic recrystallization and ZrO2 particles leads to grain refinement of Mg alloy, and the average grain size of AZ31/ZrO2 composites is 3.2 μm. After FSP, the c-axis of grain is deflected under the compression stress of shoulder and the shear stress of pin. The ultimate tensile strength (UTS) and yield strength (YS) of BM were 283 and 137 MPa, respectively, the UTS and YS of AZ31/ZrO2 composites were 427 and 217 MPa, respectively. The grain refinement and Orowan strengthening are the major strengthening mechanisms. Moreover, the corrosion resistance in simulated body fluid of Mg alloy is improved by grain refinement and the barrier effect of ZrO2.

Microstructures and Mechanical Properties of Biologically-Inspired Ti-Nb Based Alloys with Ternary Element Additions

2007 ◽  
Vol 539-543 ◽  
pp. 647-652 ◽  
Author(s):  
Han Sol Kim ◽  
Won Yong Kim
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Martensitic Transformation ◽  
Alloy System ◽  
Phase Region ◽  
Present Alloy ◽  
Β Phase ◽  
Nb Content ◽  
Microstructures And Mechanical Properties ◽  
Ternary Alloying

Microstructures and mechanical properties including elastic modulus were investigated in terms of ternary alloying elements Si addition, Nb content variations and tensile test. Martensite structure with α'(hcp) or α"(orthorhombic) was observed in Ti-xNb-1.5at.%Si, where x=10-20at.%. The crystal structure of martensite formed from water quenching process was largely dependent upon Nb content but does not on Si content. On the basis of experimental results obtained, it is suggested that Si has an effective role to suppress the precipitation of ω phase leading to reduction in elastic modulus in the metastable β phase region. Metastable β phase region was superior to reduce the elastic modulus than stable β phase region in the present alloy system. The minimum value of elastic modulus was measured to 48GPa. We have found that stress-induced martensitic transformation takes place during the deformation in the present alloys. Within the alloys having β(bcc) phase studied Nb-poor region appeared to exhibit a dominant behavior for stress-induced martensitic transformation than Nb-rich region. This result suggests that metastable β phase is superior to stable β phase for the occurrence of stress-induced martensitic transformation in the present alloy system.

Effects of Electric Current on the Microstructures and Mechanical Properties of Artificial Aged 6061 Alloy

2016 ◽  
Vol 879 ◽  
pp. 726-731
Author(s):  
Li Zi He ◽  
Ping Wang ◽  
Jing Liu ◽  
Jian Zhong Cui
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Electron Microscope ◽  
Electric Current ◽  
Conductivity Measurement ◽  
Peak Strength ◽  
Time To Peak ◽  
Β Phase ◽  
Transmission Electron ◽  
Microstructures And Mechanical Properties

The influences of electric current on the microstructures and mechanical properties of 6061 aluminum alloy were investigated by electric conductivity measurement, tensile test, scanning electron microscope and transmission electron microscope. When applying electric current both at solid solution and ageing treatment, the alloy has the highest peak strength, and the time to peak strength shortens by 12h. The electric current applying during either solid solution or ageing, increases the density and size of β'' phase.

Friction Stir Processing (FSP) of Cast Metals: Microstructure – Property Relationships in NiAl Bronze and AA5083

2010 ◽  
Vol 638-642 ◽  
pp. 35-40
Author(s):  
Terry R. McNelley ◽  
Srinivasan Swaminathan ◽  
E. Sarath Menon ◽  
J.Q. Su
Keyword(s):  
Mechanical Properties ◽  
Ambient Temperature ◽  
Friction Stir Processing ◽  
Elevated Temperatures ◽  
Stir Zone ◽  
Friction Stir ◽  
Grain Structures ◽  
Microstructures And Mechanical Properties ◽  
Step Over ◽  
Equiaxed Grain

Parameters for multi-pass FSP include the pattern of tool traverse and step-over distance between successive passes. Multi-pass FSP was conducted on as-cast NiAl bronze and as-cast AA5083 in order to modify stir zone (SZ) microstructures and mechanical properties. Highly refined and homogeneous SZ microstructures may be produced by FSP. Refined and equiaxed grain structures reflect recrystallization during FSP; mechanisms leading to homogenization by redistribution of microstructure constituents remain to be determined. Refined microstructures exhibit enhanced ambient-temperature properties and superplasticity at elevated temperatures.

Sign in / Sign up

Export Citation Format

Share Document