Microstructure and mechanical behavior of in situ TiC reinforced Fe3Al(Fe–23Al–3Cr)matrix composites by mechanical alloying and vacuum hot-pressing sintering technology

Vacuum ◽  
2020 ◽  
Vol 180 ◽  
pp. 109544 ◽  
Author(s):  
Xinghua Zhang ◽  
Yuhang Sun ◽  
Muye Niu ◽  
Min Shao ◽  
Xiaofeng Geng
Keyword(s):  
Mechanical Alloying ◽  
Mechanical Behavior ◽  
Hot Pressing ◽  
Matrix Composites ◽  
Vacuum Hot Pressing ◽  
Hot Pressing Sintering ◽  
In Situ Tic

scholarly journals Study on In-Situ Synthesis Process of Ti–Al Intermetallic Compound-Reinforced Al Matrix Composites

Materials ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 1967
Author(s):  
Qiong Wan ◽  
Fuguo Li ◽  
Wenjing Wang ◽  
Junhua Hou ◽  
Wanyue Cui ◽  
...  
Keyword(s):  
Intermetallic Compound ◽  
Intermetallic Compounds ◽  
Hot Pressing ◽  
Milling Time ◽  
Holding Time ◽  
Matrix Composites ◽  
Al Matrix Composites ◽  
Hot Pressing Sintering ◽  
Al Matrix

In this study, ball-milled powder of Ti and Al was used to fabricate Ti–Al intermetallic compound-reinforced Al matrix composites by an in-situ reaction in cold-pressing sintering and hot-pressing sintering processes. The detailed microstructure of the Ti–Al intermetallic compound-reinforced Al composite was characterized by optical microscopy (OM), X-ray diffraction (XRD), energy dispersive spectrometry (EDS), and electron backscattered diffraction (EBSD). The results indicate that a typical core–shell-like structure forms in the reinforced particles. The shell is composed of a series of Ti–Al intermetallic compounds and has good bonding strength and compatibility with the Al matrix and Ti core. With cold-pressing sintering, the shell around the Ti core is closed, and the shell thickness increases as the milling time and holding time increase. With hot-pressing sintering, some radiating cracks emerge in the shell structure and provide paths for further diffusion of Ti and Al atoms. The Kirkendall effect, which is caused by the difference between the diffusion coefficients of Ti and Al, results in the formation of cavities and a reduction in density degree. When the quantity of the intermetallic compounds increases, the hardness of the composites increases and the plasticity decreases. Therefore, factors that affect the quantity of the reinforcements, such as the milling time and holding time, should be determined carefully to improve the comprehensive properties of the composites.

scholarly journals Microstructure and properties of in situ Ti–Al intermetallic compound-reinforced Al matrix composites with dispersive distribution of core–shell-like structure

2021 ◽  
Vol 30 ◽  
pp. 263498332110061
Author(s):  
Qiong Wan ◽  
Fuguo Li ◽  
Wenjing Wang ◽  
Junhua Hou ◽  
Wanyue Cui ◽  
...  
Keyword(s):  
Intermetallic Compound ◽  
Hot Pressing ◽  
Compaction Pressure ◽  
Compressive Yield Strength ◽  
Core Shell ◽  
Matrix Composites ◽  
Al Matrix Composites ◽  
Hot Pressing Sintering ◽  
Al Matrix

Recently, Ti–Al intermetallic compound-reinforced Al matrix composites have attracted increasing attention because of their high specific modulus, strength, and thermal stability. In this study, blended powders of Ti and Al were ball milled and fabricated to in situ Ti–Al intermetallic compound-reinforced Al matrix composites by cold-pressing and hot-pressing sintering. The microstructures and component of core–shell-like structure in reinforcement were observed and analyzed. Material properties including hardness, density, and compression performance were tested and analyzed according to experimental processes. The results indicate that the time point of compression in hot-pressing sintering is crucial to obtain the closed core–shell-like structures. Based on the orthogonal experimental data, entropy methods and technique for order preference by similarity to ideal solution were combined to select the process parameters (ratio of Ti and Al, milling time, sintering temperature, holding time, and compaction pressure) for the best comprehensive performance of Vickers hardness and compressive yield strength.

Microstructure and Properties of Dilute Cu-Nb Alloy Prepared by Mechanical Alloying

2017 ◽  
Vol 729 ◽  
pp. 3-7 ◽  
Author(s):  
Ruo Shan Lei ◽  
Ming Pu Wang ◽  
Guang Run Chen ◽  
Yin Yan Li
Keyword(s):  
Electrical Conductivity ◽  
Grain Size ◽  
Mechanical Alloying ◽  
Hot Pressing ◽  
Microstructure And Properties ◽  
Vacuum Hot Pressing ◽  
Hot Pressing Sintering

This paper presents the synthesis of a Cu-0.5wt%Nb alloy via mechanical alloying (MA) and subsequent hot pressing. The evolutions of the density, microstructure, microhardness and electrical conductivity of the alloy as a function of the sintering temperatures were investigated. The results show that the microhardness of the alloy decreases with increasing consolidation temperatures, while the density and the conductivity improve. The alloy, subjected to vacuum hot-pressing sintering under 25 MPa pressure and 800 °C for 2h, has a microhardness of 102 HV and an electrical conductivity of 98% IACS. The as processed alloy is characterized by Nb nanoparticles distributed in the submicron sized Cu grains. The microhardness and electrical conductivity of the alloy are closely related with the microstructure, i.e. Cu grain size, as well as the presence and distribution of Nb nanoparticles.

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