Deformation Induced Phase Seperation of Ni45Co5 Mn36.7In13.3 Alloy at High Temperature

2011 ◽  
Vol 702-703 ◽  
pp. 896-899
Author(s):  
Gang Wang ◽  
Chun Yan Wang ◽  
Zhe Chen ◽  
Wen Ru Zhao ◽  
Yan Dong Liu ◽  
...  
Keyword(s):  
High Temperature ◽  
Hot Deformation ◽  
Matrix Alloy ◽  
Second Phase ◽  
Magnetic Shape Memory ◽  
Magnetic Shape Memory Alloys ◽  
The Matrix ◽  
New Type ◽  
Materials Used ◽  
Fcc Structure

NiMnCoIn alloys are new-type magnetic shape memory alloys (MSMAs) in which a reversible magnetic-field-induced phase transformation was observed. They are ideal candidates of materials used in actuators and sensors. The polycrystalline NiMnCoIn alloys are generally brittle so that they can not be easily deformed into the shape applicable to actuators and sensors until now. In the present paper, the influence of hot deformation on the microstructure of Ni45Co5Mn36.7In13.3alloy was studied. The experimental results showed that second phase was observed after deformation at high temperature between 800~900 °C and at strain rate lower than 4×10-3s-1. The content of Co of second phase was higher than the matrix alloy, while the content of In was lower than the matrix alloy. It was determined by TEM measurements as γ phase with fcc structure which was popular in NiFeGa and NiMnGaCo alloys. It is possible to improve the ductility of Ni45Co5Mn36.7In13.3alloy by control of amount and distribution of γ phase by hot deformation.

Effect of Temperature and Strain Rate on Microstructure of Dynamically Recrystallized Ni45Co5 Mn36.7In13.3 Alloy

2010 ◽  
Vol 654-656 ◽  
pp. 2188-2191 ◽  
Author(s):  
Gang Wang ◽  
Wen Ru Zhao ◽  
Yan Dong Liu ◽  
Chun Yan Wang ◽  
Yan Dong Wang ◽  
...  
Keyword(s):  
Strain Rate ◽  
Matrix Alloy ◽  
Effect Of Temperature ◽  
Magnetic Shape Memory ◽  
Magnetic Shape Memory Alloys ◽  
High Deformation ◽  
The Matrix ◽  
New Type ◽  
Unique Ability ◽  
Large Output

In recent years, there has been an increasing interest in magnetic shape memory alloys (MSMAs) due to their unique ability to produce very large output strains and rapid response frequency. NiMnCoIn is a new-type MSMAs in which a reversible magnetic-field-induced phase transformation is observed. The microstructural evolution in the process of dynamic recrystallization in polycrystalline Ni45Co5Mn36.7In13.3 was studied in the present paper. The experimental results showed that the high deformation temperature and slow strain rate were necessary to achieve perfect dynamic-recrystallizing microstructure in Ni45Co5Mn36.7In13.3 alloy. Precipitates with two sizes were observed. The content of Co in precipitates was higher than that in the matrix alloy, while the content of In was lower than that in the matrix alloy.

scholarly journals Microstructure and Tensile Properties of Graphene-Oxide-Reinforced High-Temperature Titanium-Alloy-Matrix Composites

Materials ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3358 ◽  
Author(s):  
Hang Chen ◽  
Guangbao Mi ◽  
Peijie Li ◽  
Xu Huang ◽  
Chunxiao Cao
Keyword(s):  
Tensile Strength ◽  
Titanium Alloy ◽  
Graphene Oxide ◽  
High Temperature ◽  
Yield Strength ◽  
Room Temperature ◽  
Second Phase ◽  
Matrix Composites ◽  
Alloy Matrix ◽  
The Matrix

In this study, graphene-oxide (GO)-reinforced Ti–Al–Sn–Zr–Mo–Nb–Si high-temperature titanium-alloy-matrix composites were fabricated by powder metallurgy. The mixed powders with well-dispersed GO sheets were obtained by temperature-controlled solution mixing, in which GO sheets adsorb on the surface of titanium alloy particles. Vacuum deoxygenating was applied to remove the oxygen-containing groups in GO, in order to reduce the introduction of oxygen. The compact composites with refined equiaxed and lamellar α phase structures were prepared by hot isostatic pressing (HIP). The results show that in-situ TiC layers form on the surface of GO and GO promotes the precipitation of hexagonal (TiZr)6Si3 particles. The composites exhibit significant improvement in strength and microhardness. The room-temperature tensile strength, yield strength and microhardness of the composite added with 0.3 wt% GO are 9%, 15% and 27% higher than the matrix titanium alloy without GO, respectively, and the tensile strength and yield strength at 600 °C are 3% and 21% higher than the matrix alloy. The quantitative analysis indicates that the main strengthening mechanisms are load transfer strengthening, grain refinement and (TiZr)6Si3 second phase strengthening, which accounted for 48%, 30% and 16% of the improvement of room-temperature yield strength, respectively.

Crystal structure and high-temperature magnetoplasticity in the new Ni–Mn–Ga–Cu magnetic shape memory alloys

2007 ◽  
Vol 56 (7) ◽  
pp. 565-568 ◽  
Author(s):  
I. Glavatskyy ◽  
N. Glavatska ◽  
A. Dobrinsky ◽  
J.-U. Hoffmann ◽  
O. Söderberg ◽  
...  
Keyword(s):  
Crystal Structure ◽  
High Temperature ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Magnetic Shape Memory ◽  
Magnetic Shape Memory Alloys

GLIDCOP AL-60

Alloy Digest ◽  
1996 ◽  
Vol 45 (8) ◽  
Keyword(s):  
Thermal Conductivity ◽  
High Temperature ◽  
Aluminum Oxide ◽  
Creep Resistance ◽  
High Strength ◽  
Thermal Softening ◽  
Second Phase ◽  
Temperature Performance ◽  
The Matrix ◽  
Metal Products

Abstract GlidCop AL-60 is copper strengthened by adding a second phase (aluminum oxide) to the matrix by internal oxidation. The process produces a product with resistance to thermal softening, high strength, and creep resistance, combined with high electrical and thermal conductivity. (See also GlidCop AL-15, Alloy Digest Cu-603, May 1996, and GlidCop AL-25, Alloy Digest Cu-604, June 1996.) This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on high temperature performance as well as forming and joining. Filing Code: CU-608. Producer or source: SCM Metal Products Inc.

GLIDCOP AL-15

Alloy Digest ◽  
1996 ◽  
Vol 45 (5) ◽  
Keyword(s):  
Thermal Conductivity ◽  
High Temperature ◽  
Aluminum Oxide ◽  
Physical Properties ◽  
High Strength ◽  
Thermal Softening ◽  
Second Phase ◽  
Temperature Performance ◽  
The Matrix ◽  
Metal Products

Abstract GlidCop AL-15 is copper strengthened by adding a second phase, aluminum oxide, to the matrix by internal oxidation. The process produces a product with resistance to thermal softening, high strength, and creep, combined with high electrical and thermal conductivity. (See also GlidCop AL-25, Alloy Digest Cu-604, June 1996, and GlidCop AL-60, Alloy Digest Cu-608, August 1996.) This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as creep. It also includes information on high temperature performance as well as forming and joining. Filing Code: CU-603. Producer or source: SCM Metal Products Inc.

The Effect of Grain-Boundary and Matrix Precipitates on High Temperature Strength in Fe3Al Based Alloys

2011 ◽  
Vol 1295 ◽  
Author(s):  
Ryo Makihara ◽  
Satoru Kobayashi ◽  
Takayuki Takasugi
Keyword(s):  
High Temperature ◽  
Grain Boundary ◽  
Tensile Tests ◽  
High Temperature Strength ◽  
Second Phase ◽  
Proof Stress ◽  
Second Phase Particles ◽  
The Matrix

ABSTRACTThe effect of grain boundary (GB) and matrix precipitates on high temperature strength was investigated in Fe3Al base alloys containing Cr, Mo and C. Tensile tests were conducted at 600°C for three types of microstructures consisting of: (I) film-like κ phase precipitates covering GBs and fine M2C particles in the matrix, (II) only fine M2C particles in the matrix and (III) no second-phase particles in the matrix. It was found that κ films on GBs are more than twice as effective as finely dispersed M2C particles for improving the proof stress.

scholarly journals Microstructure and Mechanical Properties of Carbide Reinforced TiC-Based Ultra-High Temperature Ceramics: A Review

Coatings ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1444
Author(s):  
Haobo Mao ◽  
Fuqiang Shen ◽  
Yingyi Zhang ◽  
Jie Wang ◽  
Kunkun Cui ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Solid Solution ◽  
High Temperature ◽  
Bending Strength ◽  
Second Phase ◽  
Strengthening Effect ◽  
Dispersion Strengthening ◽  
The Matrix ◽  
Ultra High Temperature

TiC ceramics have become one of the most potential ultra-high temperature structural materials, because of its high melting point, low density, and low price. However, the poor mechanical properties seriously limit its development and application. In this work, this review follows PRISMA standards, the mechanism of the second phase (particles, whiskers, and carbon nanotubes) reinforced TiC ceramics was reviewed. In addition, the effects of the second phase on the microstructure, phase composition and mechanical properties of TiC ceramics were systematically studied. The addition of carbon black effectively eliminates the residual TiO2 in the matrix, and the bending strength of the matrix is effectively improved by the strengthening bond formed between TiC; SiC particles effectively inhibit the grain growth through pinning, the obvious crack deflection phenomenon is found in the micrograph; The smaller grain size of WC plays a dispersion strengthening role in the matrix and makes the matrix uniformly refined, and the addition of WC forms (Ti, W) C solid solution, WC has a solid solution strengthening effect on the matrix; SiC whiskers effectively improve the fracture toughness of the matrix through bridging and pulling out, the microscopic diagram and mechanism diagram of SiC whisker action process are shown in this paper. The effect of new material carbon nanotubes on the matrix is also discussed; the bridging effect of CNTs can effectively improve the strength of the matrix, during sintering, some CNTs were partially expanded into GNR, in the process of crack bridging and propagation, more fracture energy is consumed by flake GNR. Finally, the existing problems of TiC-based composites are pointed out, and the future development direction is prospected.

scholarly journals Obtaining tube blanks from copper-nickel alloy МНЖ 5-1 when using a tool made of die steel adjustable austenitic transformation during operation

2021 ◽  
pp. 24-28
Author(s):  
O. Sydorchuk
Keyword(s):  
Heat Treatment ◽  
High Temperature ◽  
Nickel Alloy ◽  
Hot Deformation ◽  
Electroslag Remelting ◽  
Initial State ◽  
Copper Nickel ◽  
Austenitic Transformation ◽  
The Matrix ◽  
Copper Nickel Alloy

Purpose. Production of die tool from steel with regulation of austenitic transformation during operation to increase the level of service life during hot deformation of copper-nickel alloy. Research methods. Metallographic, high-temperature X-ray phase and dilatometric analyzes of research steel. Results. The mode of heat treatment (incomplete annealing) of steel 4Х3Н5М3Ф at a temperature of 750±20 °С, obtained by electroslag remelting, allowed to obtain a perlite-sorbitol structure at a hardness of33–34 HRC and allowed better machining by cutting the workpiece alloy. The proposed mode of final heat treatment (hardening 1030±10 °C and tempering 600±5 °C) of the investigated steel, makes it possible to heat the matrix during operation to a temperature of 600 °C. Scientific novelty. The thermal stability of the tool for hot deformation can be significantly increased when using steel with adjustable austenitic transformation during operation. Such steel in the initial state has a ferrite base, and when heated to operating temperatures occurs from α-Fe to γ-Fe conversion and, subsequently, the austenitic structure is preserved throughout the period of high-temperature operation of the stamping tool. It is confirmed that the stamping tool made of steel 4Kh3N5М3F when pressing a copper-nickel alloy works in the temperature range corresponding to the austenitization process. Practical value. Abbreviated technological operation, namely thermo-deformation processing (forging) of ingots obtained by electroslag remelting. Experimental-industrial tests of the die tool of steel 4Х3Н5М3Ф in the manufacture of tube blanks of Ø 67±0,1 mm from a copper-nickel alloy of the МНЖ 5-1 brand are carried out. As a result of research “Artemovsk plant for processing of non-ferrous metals and alloys” (Bakhmut, Donetsk region, Ukraine) at an operating temperature of 900–950 ° C, matrices made of steel 4Х3Н5М3Ф (without deformation-forging) showed stability in three times higher than the matrices from steel 3Х3М3Ф made at the enterprise.

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