scholarly journals Effect of ball milling speed and sintering temperature on microstructure and properties of TiAl alloy prepared by powder metallurgy

2020 ◽  
Vol 50 ◽  
pp. 355-361
Author(s):  
Gong Siheng ◽  
Dong Xianjuan ◽  
Xiao Xuan ◽  
Xu Yong
Keyword(s):  
Powder Metallurgy ◽  
Ball Milling ◽  
Tial Alloy ◽  
Sintering Temperature ◽  
Microstructure And Properties

Effect of Container on the Microstructure and Properties of Powder Metallurgy TiAl Alloys

2015 ◽  
Vol 817 ◽  
pp. 604-609
Author(s):  
Jie Wu ◽  
Lei Xu ◽  
Zheng Guan Lu ◽  
Rui Peng Guo ◽  
Yu You Cui ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Mild Steel ◽  
Tial Alloy ◽  
Complex Shape ◽  
Pure Titanium ◽  
Tial Alloys ◽  
Microstructure And Properties ◽  
Commercial Pure Titanium ◽  
Near Net Shape ◽  
Cp Ti

Pre-alloyed powder of Ti-47Al-2Cr-2Nb-0.15B was prepared by a gas atomization process and powder metallurgy (PM) γ-TiAl alloys were made through a hot isostatic pressed (HIPed) route. The atomized powders were canned in containers, degassed, sealed, and HIPed. Effect of two different canning materials (mild steel and commercial pure titanium (CP-Ti)) on the microstructure and properties of as-HIPed γ-TiAl alloy were discussed. Due to the reaction between mild steel containers and γ-TiAl at relative high temperature (over 1230 °C), the γ-TiAl matrix is contaminated. CP-Ti canned γ-TiAl showed bigger yield and fracture strength than mild steel canned TiAl. PM γ-TiAl alloy parts having complex shape could be manufactured by the near net-shape process.

The Effect of Sintering Temperature on Microstructure and Properties of Al – SiC Composites / Wpływ Temperatury Spiekania Na Mikrostrukture I Własnosci Kompozytów Al – SiC

2013 ◽  
Vol 58 (1) ◽  
pp. 43-48 ◽  
Author(s):  
B. Leszczynska-Madej
Keyword(s):  
Powder Metallurgy ◽  
Chemical Composition ◽  
Sintering Temperature ◽  
Single Action ◽  
Microstructure And Properties ◽  
Sic Composites ◽  
Cold Pressed ◽  
Manufacturing Parameters ◽  
Rigid Die

Attempts have been made to describe the influence of sintering temperature on the microstructure and properties of Al - SiC composites. Mixtures of 100%Al and Al - 5% SiC, Al - 10% SiC were produced by tumbling for 30 minutes in the Turbula T2F mixer. The powders were subsequently cold pressed at pressure 300MPa in a rigid die on a single action press. The green compacts were sintered in nitrogen at 580°C and 620°C for one hour. The main objective of this work was to determine influence of chemical composition and the manufacturing parameters on microstructure and properties of Al - SiC composites produced by powder metallurgy technology.

Effect of Milling Medium on Alumina Additivated with Niobia

2014 ◽  
Vol 798-799 ◽  
pp. 677-681
Author(s):  
Willian Trindade ◽  
Marcelo Henrique Prado da Silva ◽  
Alaelson Vieira Gomes ◽  
Carlos Frederico Matos Chagas ◽  
Luis Henrique Leme Louro
Keyword(s):  
Particle Size ◽  
Grain Size ◽  
Ball Milling ◽  
Sintering Temperature ◽  
Ceramic Particle ◽  
Microstructure And Properties ◽  
Sintering Additive ◽  
Final Density ◽  
Significant Contamination ◽  
Milling Medium

Niobia has been successfully used as sintering additive to alumina in order to lower its sintering temperature. This effect can also be obtained by reducing the ceramic particle size. This work investigated the effect of the particle size on the ceramic final density of alumina with 4 wt% niobia. For that two milling media were used. The as-received powders were submitted to ball and planetary milling and then sintered at 1450°C. The planetary milling medium was more efficient in reducing particle size when compared to ball milling. However, planetary milling caused significant contamination in the niobia powder, from the alumina balls used as milling agents. It forced composition balance in order to keep the original proposed formulation. The planetary milled sintered samples showed better densification and lower grain size in comparison with ball milled ones. It could be concluded that the milling medium choice directly affected both microstructure and properties of the sintered alumina with 4wt% of niobia. .

An investigation of microstructure and properties of Sn3.0Ag0.5Cu-XAl2O3 composite solder

2016 ◽  
Vol 28 (2) ◽  
pp. 84-92 ◽  
Author(s):  
Guang Chen ◽  
Bomin Huang ◽  
Hui Liu ◽  
Y.C. Chan ◽  
Zirong Tang ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Ball Milling ◽  
Composite Solder ◽  
Solder Joints ◽  
Solder Matrix ◽  
Solder Alloys ◽  
Content Type ◽  
Microstructure And Properties ◽  
Sac Solder ◽  
Powder Metallurgy Route

Purpose The purpose of this paper is to investigate microstructure and properties of Sn3.0Ag0.5Cu-XAl2O3 composite solder which were prepared through powder metallurgy route. Design/methodology/approach Sn3.0Ag0.5Cu (SAC305)-XAl2O3 (X = 0.2, 0.4, 0.6, 0.8 Wt. %) composite solders were prepared through the powder metallurgy route. The morphology of composite solder powders which consists of Al2O3 particles and SAC solder powders after ball milling was observed. The retained ratio of Al2O3 nanoparticles in composite solder billets and solder joints were also quantitatively measured. Furthermore, the as-prepared composite solder alloys were studied extensively with regard to their microstructures, thermal property, wettability and mechanical properties. Findings After ball milling, the Al2O3 nanoparticles added were observed embedded into the surface of SAC solder powders. Only about 5-10 per cent of the initial Al2O3 nanoparticles added were detected in the composite solder joints after reflow. In addition, finer ß-Sn grains were achieved with addition of Al2O3 nanoparticles; the Al2O3 nanoparticles were found retained in the composite solder matrix. Besides, negligible changes in melting temperature and the considerably reduced undercooling were obtained in composite solder alloys. Wettability was improved by appropriate addition of Al2O3 nanoparticles. Microhardness and shear strength of composite solders were both improved after Al2O3 nanoparticles addition. Originality/value This paper indicated that powder metallurgy route offered a feasible approach to produce nanoparticle reinforced composite solder. In addition, the quantitative analysis of the actual retained ratio of the Al2O3 nanoparticles in solder joints provided practical implications for the manufacture of composite solders.

Effect of Spark Plasma Sintering on the Microstructure Evolution and Properties of M3:2 High-Speed Steel

2014 ◽  
Vol 788 ◽  
pp. 329-333
Author(s):  
Rui Zhou ◽  
Xiao Gang Diao ◽  
Jun Chen ◽  
Xiao Nan Du ◽  
Guo Ding Yuan ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Spark Plasma Sintering ◽  
High Speed ◽  
Bending Strength ◽  
Sintering Temperature ◽  
High Speed Steel ◽  
Continuous Heating ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
The Impact

Effects of sintering temperatures on the microstructure and mechanical performance of SPS M3:2 high speed steel prepared by spark plasma sintering was studied. High speed steel sintering curve of continuous heating from ambient temperature to 1200°C was estimated to analyze the sintering processes and sintering temperature range. The sintering temperature within this range was divided into groups to investigate hardness, relative density and microstructure of M3:2 high-speed steel. Strip and quadrate carbides were observed inside the equiaxed grains. SPS sintering temperature at 900°C can lead to nearly full densification with grain size smaller than 20μm. The hardness and bending strength are higher than that of the conventionally powder metallurgy fabricated ones sintered at 1270°C. However, fracture toughness of the high speed steel is lower than that of the conventional powder metallurgy steels. This can be attributed to the shape and distribution of M6C carbides which reduce the impact toughness of high speed steels.

Production of Dispersion-Strengthened Cu-TiB2 Alloys by Ball-Milling and Spark-Plasma Sintering

2007 ◽  
Vol 534-536 ◽  
pp. 1489-1492 ◽  
Author(s):  
Dae Hwan Kwon ◽  
Jong Won Kum ◽  
Thuy Dang Nguyen ◽  
Dina V. Dudina ◽  
Pyuck Pa Choi ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Ball Milling ◽  
Spark Plasma Sintering ◽  
Ball Mill ◽  
Milling Time ◽  
Rotation Speed ◽  
Sintering Temperature ◽  
Milled Powder ◽  
Plasma Sintering ◽  
Spark Plasma

Dispersion-strengthened copper with TiB2 was produced by ball-milling and spark plasma sintering (SPS).Ball-milling was performed at a rotation speed of 300rpm for 30 and 60min in Ar atmosphere by using a planetary ball mill (AGO-2). Spark-plasma sintering was carried out at 650°C for 5min under vacuum after mechanical alloying. The hardness of the specimens sintered using powder ball milled for 60min at 300rpm increased from 16.0 to 61.8 HRB than that of specimen using powder mixed with a turbular mixer, while the electrical conductivity varied from 93.40% to 83.34%IACS. In the case of milled powder, hardness increased as milling time increased, while the electrical conductivity decreased. On the other hand, hardness decreased with increasing sintering temperature, but the electrical conductiviey increased slightly

Microstructure and Properties of Calcium Borosilicate and Borosilicate Glass-Ceramic Composites

2008 ◽  
Vol 368-372 ◽  
pp. 1422-1425 ◽  
Author(s):  
An Guo Lu ◽  
Tai Qiu
Keyword(s):  
Borosilicate Glass ◽  
Glass Ceramic ◽  
Mass Fraction ◽  
Sintering Temperature ◽  
Coefficient Of Thermal Expansion ◽  
Ceramic Composites ◽  
Glass Content ◽  
Microstructure And Properties ◽  
Calcium Borosilicate ◽  
Crystal Phases

Calcium borosilicate (CaO-B2O3-SiO2, CBS) glass based glass-ceramic composites were prepared by introducing borosilicate glass. The effects of borosilicate glass and firing temperature on the microstructure and properties of the glass-ceramic composites were investigated. The results showed that the composites containing 0~40% (in mass fraction, the same below) borosilicate glass can be sintered at 850°C. The dielectric constant (εr) decreases with the increase of borosilicate glass content and can be adjusted in the range of 5.6~6.6. The coefficient of thermal expansion (CTE) increases with the increase of borosilicate glass content. Increasing sintering temperature favors the precipitations of crystal phases, which have lower εr than CBS glass, resulting in the decrease of εr for the composites.

Sign in / Sign up

Export Citation Format

Share Document