scholarly journals Influence of Sc Microalloying on the Microstructure of Al5083 Alloy and Its Strengthening Effect

Metals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1120
Author(s):  
Ji-Hoon Park ◽  
Kee-Ahn Lee ◽  
Sung-Jae Won ◽  
Yong-Bum Kwon ◽  
Kyou-Hyun Kim
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Strengthening Effect ◽  
Number Density ◽  
Alloy Specimen ◽  
Microstructural Investigation ◽  
Density Of Dislocations ◽  
Pinning Effect ◽  
Sc Addition ◽  
Al Matrix

In this study, we investigate the influence of Sc microalloying on the microstructure of the Al5083 alloy. Trace amounts of Sc addition drastically improve the mechanical properties of the Al5083 alloy from 216 MPa to 233 MPa. Macroscopically, the addition of Sc significantly reduces the grain size of Al by approximately 50%. Additionally, a microstructural investigation reveals that the Sc microalloying element induces fine Al3Sc nanoprecipitates in the Al matrix. The formation of Al3Sc nanoprecipitates results in a pinning effect on the dislocations, leading to accumulated dislocations. Compared to a Sc-free Al5083 alloy specimen, the number density of dislocations in the Sc-added Al5083 alloy significantly increases after hot rolling, enhancing the tensile properties. We reveal that the improved mechanical properties of Al5083 with Sc microalloying originate from the grain refinement and the formation of fine Al3Sc nanoprecipitates.

Carbides and their Role in Advanced Mechanical Properties of L605 Alloy: Implications for Medical Devices

2014 ◽  
Vol 783-786 ◽  
pp. 1354-1359 ◽  
Author(s):  
Fan Sun ◽  
D. Mantovani ◽  
Frédéric Prima
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Tensile Tests ◽  
Tungsten Alloy ◽  
Strengthening Effect ◽  
Cobalt Chromium ◽  
Pinning Effect ◽  
Secondary Carbides ◽  
Mechanical Performances ◽  
Primary Carbides

L605 (ASTM F90), a cobalt-chromium-tungsten alloy with excellent mechanical properties and high radiopacity, has been widely accepted as a suitable alloy for stent applications. The presence of carbides in this alloy, primary carbides and secondary carbides, leads to difficulties in controlling mechanical performances and therefore in optimizing stent size and performances. This work is thus to investigate the carbides and their role in advanced mechanical properties of L605 alloy for stent fabrication. Herein, the nature, nucleation, distribution and dissolution of the carbides were investigated in a series of recrystallized L605 tubes from hard-drawn (HD) state. The mechanical properties corresponding to each carbide state were examined by tensile tests and microhardness measurements. The results indicate important relationships among carbide precipitation, grain size and mechanical behaviors, as a function of annealing temperature and duration. The intergranular secondary carbides, induced at the onset of the recrystallization of L605 matrix, were preferentially precipitated at grain boundaries. The nucleation of such particulate phase leads to a pinning effect on grain coarsening, resulting in a strengthening effect of the material. However, the further growth of the secondary carbides brings about considerable reduction of ductility, which is inacceptable for stent application. Therefore, an optimization protocol on carbides controlling was developed to maintain the strengthening effect without losing ductility and small grain size.

scholarly journals Structural and Mechanical Properties of Amorphous Si3N4 Nanoparticles Reinforced Al Matrix Composites Prepared by Microwave Sintering

Ceramics ◽  
2019 ◽  
Vol 2 (1) ◽  
pp. 126-134 ◽  
Author(s):  
Manohar Mattli ◽  
Penchal Matli ◽  
Abdul Shakoor ◽  
Adel Amer Mohamed
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Yield Strength ◽  
Volume Fraction ◽  
Microwave Sintering ◽  
Aluminum Matrix ◽  
Microstructural Investigation ◽  
Porosity Level ◽  
Amorphous Si3n4 ◽  
Al Matrix

The present study focuses on the synthesis and characterization of amorphous silicon nitride (Si3N4) reinforced aluminum matrix nanocomposites through the microwave sintering process. The effect of Si3N4 (0, 1, 2 and 3 wt.%) nanoparticles addition to the microstructure and mechanical properties of the Al-Si3N4 nanocomposites were investigated. The density of Al-Si3N4 nanocomposites increased with increased Si3N4 content, while porosity decreased. X-ray diffraction (XRD) analysis reveals the presence of Si3N4 nanoparticles in Al matrix. Microstructural investigation of the nanocomposites shows the uniform distribution of Si3N4 nanoparticles in the aluminum matrix. Mechanical properties of the composites were found to increase with an increasing volume fraction of amorphous Si3N4 reinforcement particles. Al-Si3N4 nanocomposites exhibits higher hardness, yield strength and enhanced compressive performance than the pure Al matrix. A maximum increase of approximately 72% and 37% in ultimate compressive strength and 0.2% yield strength are achieved. Among the synthesized nanocomposites, Al-3wt.% Si3N4 nanocomposites displayed the maximum hardness (77 ± 2 Hv) and compressive strength (364 ± 2 MPa) with minimum porosity level of 1.1%.

Microstructure and mechanical properties of Fe–Al–Nb–B alloys

MRS Advances ◽  
2017 ◽  
Vol 2 (25) ◽  
pp. 1353-1359 ◽  
Author(s):  
Shahbaz Ahmed Azmi ◽  
Alena Michalcová ◽  
Lucia Senčekova ◽  
Martin Palm
Keyword(s):  
Mechanical Properties ◽  
Ternary System ◽  
Grain Boundaries ◽  
Laves Phase ◽  
Uneven Distribution ◽  
Strengthening Effect ◽  
Heusler Phase ◽  
Microstructure And Mechanical Properties ◽  
Al Matrix

ABSTRACTDoping of Fe–Al–Nb alloys with boron results in precipitation of stable C14 Laves phase Nb(Fe,Al)2 instead of metastable Heusler phase Fe2AlNb as in case of the ternary system. The boron stimulated precipitation of the Laves phase leads to preferential precipitation of the Laves phase along grain boundaries and – with higher supersaturation of Nb in the Fe-Al matrix – to an even distribution of additional precipitates within the grains. Though these microstructures seem to be more favourable than in the boron-free alloys, which show an uneven distribution of rather large Laves phase precipitates, no marked strengthening effect by the Laves phase in the Fe–Al–Nb–B alloys is observed.

scholarly journals Achieving High Yield Strength and Ductility in As-Extruded Mg-0.5Sr Alloy by High Mn–Alloying

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4176
Author(s):  
Shibo Zhou ◽  
Xiongjiangchuan He ◽  
Peng Peng ◽  
Tingting Liu ◽  
Guangmin Sheng ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Yield Strength ◽  
Tensile Yield Strength ◽  
High Yield ◽  
Compressive Yield Strength ◽  
High Yield Strength ◽  
Pinning Effect ◽  
Small Grains ◽  
Strength And Ductility

The effect of Mn on the microstructure and mechanical properties of as-extruded Mg-0.5Sr alloy were discussed in this work. The results showed that high Mn alloying (2 wt.%) could significantly improve the mechanical properties of the alloys, namely, the tensile and compressive yield strength. The grain size of as-extruded Mg-0.5Sr alloys significantly was refined from 2.78 μm to 1.15 μm due to the pinning effect by fine α-Mn precipitates during the extrusion. Moreover, it also showed that the tensile yield strength and the compressive yield strength of Mg-0.5Sr-2Mn alloy were 32 and 40 percent age higher than those of Mg-0.5Sr alloy, respectively. Moreover, the strain hardening behaviors of the Mg-0.5Sr-2Mn alloy were discussed, which proved that a large number of small grains and texture have an important role in improving mechanical properties.

Microstructure and Mechanical Properties of Molybdenum Alloy Strengthened by Lanthanum Oxide and Silicon

2011 ◽  
Vol 479 ◽  
pp. 22-26 ◽  
Author(s):  
Guo Jun Zhang ◽  
Yi Zhao ◽  
Bin Li ◽  
Rui Hong Wang ◽  
Gang Lui ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Grain Size ◽  
Yield Strength ◽  
Lanthanum Oxide ◽  
Oxide Particle ◽  
Molybdenum Alloy ◽  
Strengthening Effect ◽  
Softening Effect ◽  
Microstructure And Mechanical Properties

The molybdenum alloy sheets composite strengthened by silicon and lanthanum oxide were prepared by powder metallurgy technology with Mo-La2O3(0.3wt%) and Si(0, 0.1, 0.3wt%) powders and thermo-mechanically processing. The influences of silicon content on the microstructure and mechanical properties of the final molybdenum alloy sheets were tested and analysized. The results show that the addition of lanthanum oxide and silicon can refine the alloys grain size. The introduction of lanthanum oxide particles can increase the yield strength. Although the molybdenum alloys with 0.3wt% silicon have solid solution strengthening effect, the alloys with 0.1 wt% silicon exhibits obvious solid solution softening effect at room temperature. The strengthening mechanisms are quantitatively assessed, which well explain the increase or decrease in yield strength with respect to grain size, lanthanum oxide particle and silicon solid solution.

Microstructure and Mechanical Properties of 5052 Al Alloy by Cryogenic Rolling

2020 ◽  
Vol 993 ◽  
pp. 86-91
Author(s):  
Jin Tao Shi ◽  
Jin Rong Zuo ◽  
Ji Shan Zhang
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Room Temperature ◽  
Texture Evolution ◽  
Stacking Fault ◽  
Al Alloy ◽  
Strengthening Effect ◽  
Cryogenic Rolling ◽  
Room Temperature Rolling ◽  
Relationship Of

The microstructure, mechanical properties, texture evolution and microstructure-property relationship of 5052 Al alloy by cryogenic-rolling (CR) and room-temperature rolling (RTR) were investigated. The results show that CR can effectively refine the grain size and optimize the comprehensive mechanical properties of the material. At the same time, the maximum strengthening effect of CR can be achieved when the deformation is 50%. In addition, the temperature benefit of CR can reduce stacking fault energy.

Comparison of the strengthening effects of Nb, V, and Ti on the mechanical properties of 20MnSi low-alloy steel

2020 ◽  
Vol 111 (6) ◽  
pp. 504-510
Author(s):  
Qingxiao Zhang ◽  
Qing Yuan ◽  
Wenwei Qiao ◽  
Guanghui Chen ◽  
Guang Xu
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Grain Refinement ◽  
Alloy Steel ◽  
Precipitation Strengthening ◽  
Strengthening Effect ◽  
Strengthening Mechanisms ◽  
Low Alloy Steel ◽  
Average Grain Size ◽  
Base Steel

Abstract Three alloys, containing niobium, vanadium and titanium, respectively, were refined and the strengthening effect attained after adding them individually in a 20MnSi low-alloy rebar steel was investigated. The results show that the strengthening effect attained due to the addition of niobium is the best, whereas that due to the addition of titanium is the poorest. Grain refinement and precipitation strengthening are the main strengthening mechanisms observed in niobium-steel and vanadium-steel, whereas only precipitation strengthening is observed in titanium-steel. Moreover, the average grain size of niobium-steel is the smallest among the four types of steels, while the size of ferrite and pearlite microstructures show almost no obvious change as compared to the base steel in the case of titanium-steel. Furthermore, the volume fractions of ferrite and pearlite in the four tested steels have no noticeable change.

Synthesis, microstructure, and mechanical properties of in situ TiB2/Al-4.5Cu composites

2018 ◽  
Vol 25 (3) ◽  
pp. 453-462 ◽  
Author(s):  
Hongying Li ◽  
Shouxin Zhao ◽  
Yangxun Ou ◽  
Yongqiu Lai
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Yield Strength ◽  
Particle Distribution ◽  
Matrix Composites ◽  
Strengthening Mechanisms ◽  
Microstructure And Mechanical Properties ◽  
Al Matrix Composites ◽  
Al Matrix

Abstract In situ TiB2/Al-4.5Cu composites with different TiB2 particle amounts were fabricated by the salt-metal reaction technique. The effects of in situ TiB2 on the microstructure and mechanical properties of Al-4.5Cu alloy were studied in this paper. The results showed that in situ TiB2 particles had significant effect on refining grain size and improving mechanical properties of as-cast Al-4.5Cu alloy. With the amounts of TiB2 particles increasing, the yield strength and ultimate tensile strength were improved, while the elongation reduced. The strengthening mechanisms of the in situ particle-reinforcing Al matrix composites were discussed, and the yield strength was predicted accurately by accounting for the three strengthening mechanisms and particle distribution.

Grain Refining Effect of Al-5Ti-1B Master Alloy on Microstructures and Mechanical Properties of A356 Alloy

2019 ◽  
Vol 803 ◽  
pp. 17-21 ◽  
Author(s):  
Thee Chowwanonthapunya ◽  
Chaiyawat Peeratatsuwan
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Master Alloy ◽  
Mechanical Performance ◽  
A356 Alloy ◽  
Casting Process ◽  
Grain Refining ◽  
Grain Refiner ◽  
Microstructures And Mechanical Properties ◽  
Al Matrix

In this study, the structures of Al-5Ti-1B master alloy and its influence on microstructures and mechanical properties of A356 alloy were investigated. The results show that Al-5Ti-1B master alloy consisted of the uniform distribution of lump-like TiB2 and network of TiAl3 on α-Al matrix. The addition of the Al-5Ti-1B master alloy can significantly reduce the grain size of A356 alloy. The mechanical properties of A356 alloy, i.e. ultimate tensile strength, yield strength and elongation were also improved. The use of Al-5Ti-1B master alloy as a grain refiner in the casting process of A356 alloy can effectively enhance the grain refinement and thus improve the mechanical performance of A356 alloy.

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.

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