Wear of Ductile-Phase Toughened NiAl

1994 ◽  
Vol 364 ◽  
Author(s):  
F.E. Kennedy ◽  
I. Baker ◽  
B.J. Johnson
Keyword(s):  
Fracture Toughness ◽  
Intermetallic Compounds ◽  
Room Temperature ◽  
Wear Behavior ◽  
Heat Treatments ◽  
Material System ◽  
Ductile Phase ◽  
Pin On Disk ◽  
The Relationship

AbstractThe purpose of this work was to study the effect of ductile phases on the wear of brittle intermetallic compounds. The material system of interest was NiAl with an incorporated ductile Fe phase. Three different compositions were studied: Fe10Ni45Al45, Fe30Ni35Al35, and Fe44Ni28Al28, each after two different heat treatments. Their wear behavior in unlubricated sliding against zirconia was investigated using pin-on-disk tests at room temperature in air. Hardness and fracture toughness tests were run for the same materials to clarify the relationship between wear and deformation. Results for the ductile-phase toughened materials were compared with results of similar tests for unalloyed NiAl.

The Strength and Ductility of Intermetallic Compounds: Grain Size Effects

1986 ◽  
Vol 81 ◽  
Author(s):  
E.M. Schulson ◽  
I. Baker ◽  
H.J. Frost
Keyword(s):  
Grain Size ◽  
Yield Strength ◽  
Intermetallic Compounds ◽  
Size Effects ◽  
Nickel Aluminide ◽  
Marked Reduction ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
The Relationship ◽  
Strength And Ductility

Since writing on this subject two years ago [1], a number of developments have occurred, particularly in relation to the mechanical properties of the L12 nickel aluminide Ni3Al. Some elucidate the nature of the yield strength and the extraordinarily beneficial effect of boron on low-temperature ductility. Some others expose, at least in part, the nature of the marked reduction in ductility at elevated temperatures. Another considers the mechanisms dominating creep deformation. Also during this period, contradictions have appeared: the relationship between the yield strength and the grain size, d, at room temperature has been contested, and opposing views of grain refinement on ductility have been reported.This paper reviews these developments. Although broadly directed at intermetallic compounds, the discussion is specific to Ni3Al. The hope is that the knowledge and understanding gained about this compound will benefit the class as a whole.

Investigation on Wear Behavior at High Temperature of Smooth and Bionic Non-Smooth Samples

2012 ◽  
Vol 157-158 ◽  
pp. 1628-1631
Author(s):  
Xiao Dong Yang ◽  
Zhuo Juan Yang ◽  
You Quan Chen
Keyword(s):  
High Temperature ◽  
Wear Mechanism ◽  
High Speed ◽  
Room Temperature ◽  
Wear Behavior ◽  
High Speed Steel ◽  
Wear Test ◽  
Test Method ◽  
Wear Characteristics ◽  
Pin On Disk

By using pin-on-disk wear test method, the wear behavior of W9Gr4V high speed steel with smooth and non-smooth concave samples which treated by laser texturing technology was investigated between room temperature and 500 . It was found that the anti-wear ability of the non-smooth concave samples was increased more than that of the smooth ones and the anti-wear ability of the non-smooth samples was evident than the smooth ones at temperature increasing. In this paper, the anti-wear mechanism of non-smooth concave samples and wear characteristics with smooth and non-smooth samples in high-temperature were analyzed.

Solidification Processing and Fracture Behavior of RuAl-Based Alloys

2004 ◽  
Vol 842 ◽  
Author(s):  
Todd Reynolds ◽  
David Johnson
Keyword(s):  
Solid Solution ◽  
Fracture Toughness ◽  
Fracture Behavior ◽  
Room Temperature ◽  
Volume Fraction ◽  
Solidification Processing ◽  
Ductile Phase

ABSTRACTAlloys of RuAl-Ru were processed using various solidification methods, and the fracture behavior was examined. The fracture toughness values for RuAl-hcp(Ru, Mo) and RuAl-hcp(Ru, Cr) alloys ranged from 23 to 38 MPa√m, while the volume fraction of RuAl ranged from 22 to 56 percent. Increasing the volume fraction of RuAl resulted in a decrease in fracture toughness. The hcp solid solution was shown to be the more ductile phase with a fracture toughness approaching 68 MPa?m, while the B2 solid solution (RuAl) was found to have a fracture toughness less than 13 MPa√m. An alloy of Ru-7Al-38Cr (at.%) that consisted of a hcp matrix with RuAl precipitates had the highest room temperature toughness and the greatest hardness.

The Effects of Molding Materials on Microstructure and Wear Behavior of A356 Alloy

2017 ◽  
Vol 36 (5) ◽  
pp. 515-521
Author(s):  
Musa Yildirim ◽  
Dursun Özyürek ◽  
Tansel Tunçay
Keyword(s):  
Weight Loss ◽  
Cooling Rate ◽  
Wear Behavior ◽  
A356 Alloy ◽  
Heat Treatments ◽  
Mg Alloy ◽  
Pin On Disk ◽  
Molding Materials ◽  
Hardness Values ◽  
Wear Tests

AbstractIn this study, the effect of molding materials on microstructure and wear behavior of A356 alloy was investigated. Different microstructures were obtained by casting A356 alloy into the molds made from three different materials. Homogenization and aging heat treatments were applied as cast blocks. The aged samples were tested by pin-on-disk-type standard wear equipment. The results showed that casting into different mold materials resulted in different microstructures of A356 alloy. Microstructures of the Al–Si–Mg alloy differ depending on the mold materials. Secondary dendrite arm space (SDAS) decreased proportionally with increasing cooling rate. Based on the cooling rate, hardness values of the alloy also differ. As the cooling rate increased, hardness of the alloy increased. The SDAS increased due to the decreasing cooling rate. In wear tests, increasing weight loss was observed with decreasing cooling rate.

Effect of Trace Ce and B Additions on the Mechanical Properties of Nb-3Si-22Ti Alloys

2017 ◽  
Vol 898 ◽  
pp. 454-460
Author(s):  
Mei Ling Wu ◽  
Feng Wei Guo ◽  
Ming Li ◽  
Yong Wang Kang ◽  
Ya Fang Han
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Compressive Strength ◽  
Room Temperature ◽  
Arc Melting ◽  
Trace Addition ◽  
B Additions ◽  
Temperature Fracture ◽  
Ultrahigh Temperature ◽  
The Relationship

The Nb-Si system ultrahigh temperature alloys were prepared by vacuum non-consumable arc melting. The influence of micro-alloying elements of B and Ce on the hardness, room-temperature fracture toughness and compressive strength at 1250°C of the Nb-22Ti-3Si alloys was investigated and estimated systematically. The results showed that the hardness of the Nb-22Ti-3Si alloy increased obviously with trace B addition, but decreased slightly with trace Ce addition. The room-temperature fracture toughness of the Nb-22Ti-3Si alloy was degraded by the Ce addition but improved by the trace addition of B. The trace addition of B improved the compressive strength of the alloy at 1250°C. In contrast, the trace Ce addition degraded the compressive strength at 1250°C. The relationship between the microstructure and the mechanical properties was discussed.

Properties of Semisolid Parts: Comparison with Conventional and Innovative Manufacturing Technologies

2022 ◽  
Vol 327 ◽  
pp. 197-206
Author(s):  
Pietro Tonolini ◽  
Annalisa Pola ◽  
Lorenzo Montesano ◽  
Marialaura Tocci ◽  
Marcello Gelfi ◽  
...  
Keyword(s):  
Wear Behavior ◽  
Microstructural Analysis ◽  
Damage Mechanism ◽  
Wear Properties ◽  
Heat Treated ◽  
Production Technologies ◽  
Manufacturing Technologies ◽  
Pin On Disk ◽  
Pressure Die Casting ◽  
The Relationship

In this paper, wear properties of samples manufactured using thixocasting were compared with those of components obtained using low-pressure die-casting and additive manufacturing in order to assess the relationship between material performance and production technologies, both conventional and innovative. The investigated items were made with AlSi7Mg alloy. First, microstructural analysis and hardness measurements were carried out. Subsequently, pin-on-disk wear tests were performed. Wear behavior of the samples was studied considering both coefficient of friction and wear rate, while the damage mechanism was analyzed by observation of the worn paths using scanning electron microscope, correlating the behavior to the specific microstructure. In addition, the effect of selected heat-treated conditions, relevant for real applications, on wear properties was also evaluated.

Effect of Trace Strontium Addition on Microstructure and Room Temperature Fracture Toughness of Nb-12Si-22Ti Alloys

2016 ◽  
Vol 849 ◽  
pp. 603-608 ◽  
Author(s):  
Mei Ling Wu ◽  
Feng Wei Guo ◽  
Ming Li ◽  
Ya Fang Han
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Room Temperature ◽  
X Ray Diffraction ◽  
X Ray ◽  
Temperature Fracture ◽  
The Relationship ◽  
Scanning Electron

The effect of strontium (Sr) addition (0.2 at.%) on the microstructure and mechanical properties of Nb-12Si-22Ti alloys were studied. Microstructure of the alloys was observed by scanning electron microscope, and their phase compositions were analyzed with X-ray diffraction and Electro-Probe Microanalyzer. The room temperature fracture toughness was measured. The results indicated that the phases of Nbss and Nb3Si were presented in Nb-12Si-22Ti alloys. However, with the Al and Sr addition, the alloys were composed of Nbss and β-Nb5Si3. Compared with the Nb-12Si-22Ti alloys, the value of room temperature fracture toughness increased about 46% and 73% with the addition of Al and Sr alloy, respectively. The relationship between the microstructure and the mechanical properties was discussed.

Effect of Mo Addition on Microstructure and Properties of Nb/Nb5Si3 In-Situ Composite

2004 ◽  
Vol 449-452 ◽  
pp. 753-756 ◽  
Author(s):  
Wei Li ◽  
Hai Bo Yang ◽  
Ai Dang Shan ◽  
Jian Sheng Wu
Keyword(s):  
Fracture Toughness ◽  
Room Temperature ◽  
Metastable Phase ◽  
High Strength ◽  
High Fracture Toughness ◽  
High Fracture ◽  
Ductile Phase ◽  
Temperature Fracture ◽  
The Stability

Nb/Nb5Si3 in-situ composites are very attractive structural materials for these materials perform a good balance in mechanical properties, including a high strength at high temperature (>1373K) and reasonably high fracture toughness at room temperature. Metastable phase Nb3Si plays an important role in the properties of Nb/Nb5Si3 composites by affecting microstructure and volume fracture of ductile phase. In this paper, Nb-10Si-xMo and Nb-18Si-xMo (x=0,5,15) are prepared by arc melting and annealed at 1473K for 100h. Single edge-notched bending (SENB) test was used to study the fracture toughness of Nb-Si-Mo alloys. The stability of metastable phase is analyzed by XRD. The room temperature fracture toughness of Nb-10Si is 10.47MPa(m)1/2 and higher than that of binary Nb-18Si alloys at near-eutectic compositions. The addition of Mo improves the fracture toughness of as cast Nb-Si alloys from 4.1 MPa(m)1/2 to 9.9MPa(m)1/2 at near-eutectic compositions and decreases it from 10.47 MPa(m)1/2 to 8.8MPa(m)1/2 at hypoeutectic compositions.

Temperature-Induced Orientation Instability During Meiosis: An Experimental Analysis

1970 ◽  
Vol 6 (2) ◽  
pp. 323-350
Author(s):  
S. A. HENDERSON ◽  
R. B. NICKLAS ◽  
CAROL A. KOCH
Keyword(s):  
Low Temperature ◽  
Experimental Analysis ◽  
Room Temperature ◽  
Time Lapse ◽  
Heat Treatments ◽  
Orientation Behaviour ◽  
The Past ◽  
Melanoplus Differentialis ◽  
The Relationship ◽  
Chromosome Motion

Low-temperature (10 °C) treatments alternated with periods at room temperature (25 °C) were found to induce grossly abnormal kinetochore orientation behaviour during metaphase I in spermatocytes of the grasshopper Melanoplus differentialis. These orientation abnormalities involved multiple reorientations before a stable bipolar co-orientation was finally achieved. Similar orientation abnormalities have been induced in the past by heat-treatments in the locust Schistocerca. The unstable orientation behaviour of bivalents in eight cold-treated living spermatocytes was analysed with the aid of time-lapse cinematographic records. Analyses made included the relationship between kinetochore position within the spindle and reorientation, the frequency of reorientation and the velocity of chromosome motion after reorientation. It had been shown previously, in untreated cells, that physical tension applied by micromanipulation could stabilize experimentally induced unipolar bivalents and inhibit their reorientation. Two experiments of this type with cold-treated spermatocytes were successful in demonstrating the importance of tension in the maintenance of stability, even in unstable, cold-treated material. In discussing the interpretation of these results it is proposed that bivalents have an inherent tendency to reorient periodically. In untreated cells the time between reorientations is long enough to enable interkinetochoric tensions, and resulting stable bipolar orientation, to be achieved, but in cold-treated cells this time is reduced, thereby hindering the establishment of tension and stability.

Wear behavior and microstructure of Fe-C-Si-Cr-B-Ni hardfacing alloys

2021 ◽  
Vol 63 (3) ◽  
pp. 231-234
Author(s):  
Zeynep Taslicukur Öztürk
Keyword(s):  
Wear Resistance ◽  
Room Temperature ◽  
Wear Behavior ◽  
Welding Process ◽  
Hardness Test ◽  
Test Results ◽  
Hardfacing Alloy ◽  
Wear Analysis ◽  
Granular Microstructure ◽  
The Relationship

Abstract This study aims to investigate the relationship between wear resistance and microstructure of a hardfacing alloy Fe-C-Si-Cr-B-Ni system as well as investigating ways of improving the hardness of the hard facing layer through the addition of nickel to achieve a finer granular microstructure. Three hardfacing alloys are used for overlaying. Ferroboron (FeB) and Ferronickel(FeNi), are added to the massive wire during the welding process. A hardness test, microscopic characterization and wear analysis are carried out on the samples. The surfaces of the samples are examined using scanning electron micsoscope in order to better understand the wear mechanism. At room temperature, wear occurs through a combination of abrasive grooving and local delamination. Microstructure and hardness affect the wear resistance of the alloys. Test results shows that as hardness increases, wear resistance increases.

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