scholarly journals Effects of Trace Erbium Addition on Microstructure and Mechanical Properties of Ti6Al4V-xEr Alloys

Metals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 628 ◽  
Author(s):  
Yakun Wu ◽  
Yanhua Guo ◽  
Guanglong Xu ◽  
Hui Chang ◽  
Yuwen Cui
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Earth Element ◽  
Grain Refining ◽  
Microstructural Characteristics ◽  
Two Phase ◽  
Β Phase ◽  
Hardness Tests ◽  
Strength And Plasticity ◽  
Titanium Alloy Ti6al4v

In order to discern the effect of rare earth element Er addition on grain refinement of the most widely used titanium alloy Ti6Al4V, new erbium modified Ti6Al4V alloys with compositions of Ti6Al4V-xEr (x = 0, 0.2, 0.4, 0.6 wt %) were developed and investigated for their microstructural characteristics and mechanical properties in comparison with their unmodified baseline alloy. Microstructural examinations revealed that, by adding Er, (1) the microstructure primarily retained a two-phase structure consisting of α and β, (2) remarkable grain refining occurred, and (3) some Er2O3 and Al2Er disperses were formed largely around the β phase and near the grain boundaries. Mechanical property measurements evidenced an overall enhancement under tension and hardness tests. An increase in both strength and plasticity with increasing Er content was obtained but followed by a drop, while a gradual monotonous improvement in hardness was achieved. The Ti6Al4V-0.2Er alloy exhibits optimal mechanical properties.

Comparison of Microstructure and Mechanical Properties between ZM21 and ZME210 with Different Hot Extrusion Ratios

2009 ◽  
Vol 610-613 ◽  
pp. 796-800 ◽  
Author(s):  
Jian Peng ◽  
Cheng Meng Song ◽  
Ya Zhong Zhao ◽  
Fu Sheng Pan
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Hot Extrusion ◽  
Extrusion Ratio ◽  
Microscopic Structure ◽  
Grain Refining ◽  
Limit Value ◽  
Microstructure And Mechanical Properties ◽  
Ratio Limit ◽  
Zm21 Magnesium Alloy

The mechanical properties and microstructure of the as-extruded ZM21 magnesium alloy and its modified alloy ZME210 with addition of 0.35wt% cerium were investigated with different extrusion ratios from 14 to 182 by using mechanical property test, microscopic structure quantitative analysis, SEM observation and energy spectrum analysis. The results showed that both ZM21 and ZME210 had an extrusion ratio limit for grain refining, and the grains were found to be finer with higher extrusion ratio when the ratio was not higher than the limit value. The extrusion ratio limit for the best effect for grain refining of ZME210 is lower than that of ZM21. It was found that the Ce can refine the grains effectively after hot extrusion with different extrusion ratios. The effects of Ce on the microstructure and mechanical properties were analyzed.

Influence of the Ageing Temperature on the Selected Mechanical Properties of the Ti6Al7Nb Alloy

2015 ◽  
Vol 641 ◽  
pp. 120-123 ◽  
Author(s):  
Robert Dąbrowski ◽  
Janusz Krawczyk ◽  
Edyta Rożniata
Keyword(s):  
Mechanical Properties ◽  
Impact Strength ◽  
Volume Fraction ◽  
Heating Temperature ◽  
Ageing Temperature ◽  
Sample Length ◽  
Two Phase ◽  
Β Phase ◽  
Α Phase ◽  
The Impact

The results of investigations of the influence of the ageing temperature on the selected mechanical properties i.e. hardness, fracture toughness (examined by the linear elastic fracture mechanics - KIctest) and impact strength (KV) of two-phase Ti6Al7Nb alloy, are presented in the hereby paper. Investigations were performed in the ageing temperatures range: 450÷650°C of the alloy previously undercooled from the selected heating temperature (in two-phase range) - equal 970°C. The heating temperature was determined on the basis of the dilatometric curve of the alloy heating in the system ΔL = f ((T), where: ΔL – change of the sample length, T – temperature, which was then differentiated in the system: ΔL/ΔT = f (T). The dilatometer L78 R.I.T.A of the LINSEIS Company was used in the tests. Investigations of the alloy microstructure in the ageing temperatures range 450÷650°C were carried out by means of the light microscope Axiovert 200 MAT of the Carl Zeiss Company. It was found that nearly equiaxial grains of the primary α phase occur in the microstructure (of the volume fraction app. 30%) and that the volume fraction of the new lamellar α phase - formed from the supersaturated β phase - increases. With an increase of the alloy ageing temperature, in the mentioned above range, a small increase of its hardness from 305 to 324HV as well as a decrease of stress intensity factor KIcfrom 67.3 to 48.6 MPa x m1/2and impact strength (KV) from 40.2 to 31.3 J. The impact tests results were supplemented by the fractographic documentation. It was found, that the characteristic features of the fractures of impact test samples do not exhibit essential differences in dependence of the ageing temperature and material hardness. The fractographic investigations were performed by means of the scanning electron microscope NovaNanoSEM 450.

Microstructure Control and Mechanical Property Correlation in Titanium Alloy Ti-6Al-4V Fasteners for Space Applications

2015 ◽  
Vol 830-831 ◽  
pp. 354-357
Author(s):  
S.V.S. Narayana Murty ◽  
Sushant Manwatkar ◽  
P. Ramesh Narayanan
Keyword(s):  
Mechanical Property ◽  
Titanium Alloy ◽  
High Strength ◽  
Beta Phase ◽  
Strength Properties ◽  
Head Region ◽  
Two Phase ◽  
Space Applications ◽  
Β Phase ◽  
Torque Values

High strength fasteners of Titanium alloy Ti-6Al-4V are widely used in both launch vehicle and satellite structures. Ti-6Al-4V fasteners having three different types of microstructures were analysed for mechanical properties to understand the role of two phase α+β or transformed β phase in the head region. Based on the microstructure-mechanical property correlations, it was concluded that the presence of transformed beta phase will not affect the strength properties, but will produce scatter in percentage elongation, percentage reduction in area and failure torque values. Therefore, it is recommended that the microstructure of aerospace titanium alloy Ti-6Al-4V fasteners should contain homogeneous two phase α+β throughout.

Effect of Sn on microstructure and mechanical properties of Ti-Fe-(Sn) ultrafine eutectic composites

2010 ◽  
Vol 25 (5) ◽  
pp. 943-956 ◽  
Author(s):  
Jayanta Das ◽  
Ralf Theissmann ◽  
Wolfgang Löser ◽  
Jurgen Eckert
Keyword(s):  
Mechanical Properties ◽  
Fracture Strain ◽  
High Strength ◽  
Lattice Parameter ◽  
Eutectic Alloys ◽  
Two Phase ◽  
Arc Melting ◽  
Structural Fluctuations ◽  
Strength And Plasticity ◽  
Micrometer Size

High strength (Ti0.705Fe0.295)100-xSnx (0 ≤ x ≤ 6) composites have been prepared through arc melting and cold crucible casting. The microstructure consists of two phase ultrafine eutectic comprised of FeTi and β-Ti phases. The effect of Sn addition to the Ti70.5Fe29.5 eutectic is assessed in terms of microstructure variations such as eutectic spacing, morphology, cell size, lattice parameter of the phases, and the resulting mechanical properties in terms of strength and plasticity under compression. The mechanical properties (maximum strength 1939 MPa, fracture strain 13.5%) of the ternary Ti-Fe-Sn (2 ≤ x ≤ 6) are considerably improved compared to the Ti70.5Fe29.5 binary alloy (1733 MPa, 3.4%). The change in the morphology of the eutectic, the microstructure refinement, structural fluctuations, and supersaturation in the β-Ti phase, and the elastic properties of nanophases are crucial factors for improving the plastic deformability of the ultrafine eutectic alloys without presence of any additional micrometer-size toughening phase.

Effect of Welding Speed on CO2 Laser Beam Welded Aluminum-Magnesium Alloy 5083 in H321 Condition

2013 ◽  
Vol 685 ◽  
pp. 259-263 ◽  
Author(s):  
K. Subbaiah ◽  
Geetha Manivasagam ◽  
B. Shanmugarajan ◽  
S.R. Koteswara Rao
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Laser Beam ◽  
Welding Speed ◽  
Welded Joint ◽  
Laser Beam Welding ◽  
Tensile Tests ◽  
Micro Hardness ◽  
Microstructural Characteristics ◽  
Hardness Tests

Laser beam welding of aluminum alloys is expected to offer good mechanical properties of welded joints. In this experimental work reported, CO2 laser beam welding at 3.5 kW incident power was conducted autogenously on 5 mm thick 5083-H321 aluminum alloy plates at different welding speeds. The mechanical properties and microstructural characteristics of the welds are evaluated through tensile tests, micro-hardness tests, optical microscopy and scanning electron microscopy (SEM). Both yield stress and tensile strength of the laser beam welded joint at the optimum welding speed were 88 % of base metal values. Experimental results indicate that the tensile strength and hardness of laser beam welds are affected by the variation of the intermetallic compounds.

scholarly journals Effect of Ca Concentration on Microstructure and Mechanical Properties of As-Cast and As-Extruded Quasicrystal-Strengthened Mg-7.2Zn-2.4Gd Alloy

2018 ◽  
Vol 2018 ◽  
pp. 1-7
Author(s):  
Jianchun Sun ◽  
Yilong Ma ◽  
Hongwei Miao ◽  
Kejian Li ◽  
Chunhong Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Grain Size ◽  
Rare Earth ◽  
Room Temperature ◽  
Earth Element ◽  
Extrusion Ratio ◽  
Gravity Casting ◽  
Ca Addition ◽  
Cast Alloys

Quasicrystal-strengthened Mg-Zn-RE (RE = rare-earth element) alloys have been investigated extensively due to their excellent mechanical properties. Here, we prepare quasicrystal-strengthened Mg-7.2Zn-2.4Gd (wt.%) alloy with different concentrations of Ca addition (0, 0.16, 0.32, and 0.64 wt.%) by traditional gravity casting, followed by extrusion at 573 K with the extrusion ratio of 9 : 1. The microstructure and room temperature tensile properties of as-cast and as-extruded alloys are characterized. With the addition of the trace amount of Ca, the I-phase tends to transfer into W-phase due to the appearance of Mg2Ca and Mg6Zn3Ca2. As a consequence, the mechanical properties of the as-cast Ca containing alloys are downgraded. After extrusion, in comparison to the as-cast alloys, microstructure of the four types of alloys is refined and mechanical property is enhanced greatly. With the increasing of Ca concentration, the grain size is decreased gradually. However, the yield strength of the alloys is decreased to about 230 MPa and then up to 269 MPa, while the elongation increases first from 12.9% to 13.6% yet then decreases to 9.9%.

Effect of Nd on the Microstructure and Mechanical Properties of High Aluminum Zinc-Based Alloy

2011 ◽  
Vol 391-392 ◽  
pp. 564-568
Author(s):  
Ai Li Wei ◽  
Kun Yu Zhang ◽  
Xian Rong Li ◽  
Wei Liang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Elevated Temperatures ◽  
Grain Refining ◽  
Micro Hardness ◽  
Microstructure And Mechanical Properties ◽  
Hardness Tests ◽  
And Performance ◽  
Microstructure And Performance ◽  
High Aluminum

This work mainly investigated the influence of element Nd on the microstructure and mechanical properties of the Zn-25Al-5Mg-2.5Si alloys with different Nd contents. The tensile and hardness tests were carried out at room and elevated temperatures. The results show that the addition of element Nd leads to the grain refining and the formation of Al2Nd and NdZn2 phases in the microstructure, and the mechanical properties of the alloys rise at first and then drop with the increasing of Nd content. The optimization of microstructure and performance especially the tensile strength at high temperature is obtained when Nd content is 0.8 wt.%. It can result in increase of tensile strength by 48.8% and micro-hardness by 67.4% at 180。C.

Study on Mechanical Properties of EPDM/HPVC Prepared by Dynamic Vulcanization

2011 ◽  
Vol 299-300 ◽  
pp. 751-754 ◽  
Author(s):  
Bing Liang ◽  
Jie Mei Ji ◽  
Xiao Dong Hong
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Phase Structure ◽  
Thermoplastic Elastomer ◽  
Continuous Phase ◽  
Mass Ratio ◽  
Dynamic Vulcanization ◽  
Two Phase ◽  
Excellent Mechanical Property ◽  
Aging Resistance

A thermoplastic elastomer of EPDM/HPVC with excellent properties was prepared by dynamic vulcanization. The effects of the rubber/plastics ratio, the content of plasticizer and vulcanizing agent on the mechanical properties of EPDM/HPVC were investigated in detail. Results indicate when the mass ratio of EPDM/HPVC was 30/70, CPE was 9 phr, sulfur was 0.4 phr, EPDM/HPVC had an excellent mechanical property and aging resistance. EPDM/HPVC prepared by dynamic vulcanization had a typical sea-island two phase structure in which smaller EPDM particle dispersed uniformly in the continuous phase of HPVC.

A STUDY ON MICROSTRUCTURAL AND MECHANICAL PROPERTIES OF NANOCRYSTALLINE NICKEL

2005 ◽  
Vol 04 (04) ◽  
pp. 615-622 ◽  
Author(s):  
KATTA MOHANKUMAR ◽  
K. S. SIOW ◽  
RENGASWAMY JAYAGANTHAN ◽  
ANDREW A. O. TAY ◽  
VAIDYANATHAN KRIPESH
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Mechanical Milling ◽  
Elastic Moduli ◽  
Nanocrystalline Nickel ◽  
Microstructural Characteristics ◽  
Processing Methods ◽  
Grain Sizes

The microstructural characteristics and mechanical property of the Nanocrystalline Nickel ( Nc -Nickel), produced by Electrodeposition (ED) and Mechanical milling (MM), were investigated in the present work. From the nanoindentation study, we observed that MM - Nc - Ni showed lower hardness than ED - Nc - Ni and Microcrystalline ( Mc )- Ni . ED - Nc - Ni showed a significant improvement in hardness. All the Nc -Nickel samples, regardless of processing methods and grain sizes, showed comparable elastic moduli. The lower hardness of MM - Nc - Ni is due to the presence of microcrystalline Nc - Ni .

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