High ZT Value of Pure SnSe Polycrystalline Materials Prepared by High-Energy Ball Milling plus Hot Pressing Sintering

2021 ◽  
Vol 13 (36) ◽  
pp. 43011-43021
Author(s):  
Xian Luo ◽  
Bowei Huang ◽  
Xiang Guo ◽  
Wenjie Lu ◽  
Guiyuan Zheng ◽  
...  
Keyword(s):  
Ball Milling ◽  
Hot Pressing ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Polycrystalline Materials ◽  
Energy Ball ◽  
Hot Pressing Sintering

Microstructures and Mechanical Properties of TiAl-Based Alloys Prepared by High-Energy Ball Milling and Hot-Pressing Sintering

2011 ◽  
Vol 704-705 ◽  
pp. 828-831
Author(s):  
Tian Guo Wang ◽  
Qun Qin ◽  
Qiu Yue Shi ◽  
Wen Jun Zhang
Keyword(s):  
Mechanical Properties ◽  
Ball Milling ◽  
Hot Pressing ◽  
Room Temperature ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Uniform Microstructure ◽  
Energy Ball ◽  
Hot Pressing Sintering ◽  
The Relationship

TiAl-based alloy with a composition of Ti-47%Al-3%Cr (mole fraction) was prepared by high-energy ball milling and hot-pressing sintering. The relationship between microstructure and mechanical properties of Ti-47%Al-3%Cr alloy was studied by X-ray diffractometry (XRD), scanning electron microscopy (SEM) and mechanical testing. The results showed that the TiAl-based alloy with high density and uniform microstructure could be obtained by high-energy ball milling and hot-pressing sintering. The compactibility and sintering densification of the element powder could be promoted efficiently by high-energy ball milling. The main phase TiAl and few phases Ti3Al were observed in the hot pressing sintering bulk samples. In addition, the microstructure changed with ball milling times, as a result, the mechanical properties changed with the microstructure. The finer the microstructure was, the higher the strength at room temperature became. After the element powder was milled for 20 hours and hot-pressing sintered at 1300 °C for 2 hours, TiAl-based alloys were found to have good room temperature mechanical properties with the compressive strength of 2870 Mpa and the relative compressive ratio of 27.3%. Keywords: TiAl-based alloys; hot-pressing sintering; microstructure; mechanical properties

Micromechanical behavior of β-Al3Mg2-dispersed aluminum composite prepared by high-energy ball milling and hot pressing

2016 ◽  
pp. 002199831667370 ◽  
Author(s):  
Shubhadeep Maity ◽  
Sumit Chabri ◽  
Subhranshu Chatterjee ◽  
Supriya Bera ◽  
Arijit Sinha
Keyword(s):  
Ball Milling ◽  
Hot Pressing ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Aluminum Composite ◽  
Energy Ball ◽  
Dispersed Aluminum

BBPPAmorphous Si-B-C-N Ceramics Fabricated by High Energy Ball Milling and Hot Pressing

2007 ◽  
Vol 353-358 ◽  
pp. 1505-1508
Author(s):  
Zhi Hua Yang ◽  
Yu Zhou ◽  
De Chang Jia ◽  
Qing Chang Meng ◽  
Chang Qing Yu
Keyword(s):  
Ball Milling ◽  
Hot Pressing ◽  
Hexagonal Boron Nitride ◽  
High Energy ◽  
High Energy Ball Milling ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Energy Ball ◽  
Amorphous Si

Amorphous Si-B-C-N ceramics obtained by high energy ball milling and hot pressing using hexagonal boron nitride (h-BN), graphite (C) and amorphous Si as starting materials have been studied. The mechanical milling with high energy resulted in the generation of large amounts of amorphous composites only milled for 5 h. Si-B-C-N powders were consolidation by hot pressing at 1850 °C. X-ray diffraction (XRD) and transmission electron microscopy (TEM) show that small amount of BN and SiC crystal lies in the amorphous matrix. The flexural strength reached the maximal value of 137.2 MPa at a mole ratio of BN/(Si+C) being 0.6.

High-Energy Ball Milling and Hot Pressing of the Ni-48Ti-2Sn and Ni-45Ti-5Sn Powder Mixtures

2014 ◽  
Vol 802 ◽  
pp. 29-34
Author(s):  
Leandro Koji Kayano ◽  
Daniel Murusawa ◽  
Gilda Maria Cortez Pereira ◽  
Alfeu Saraiva Ramos
Keyword(s):  
Ball Milling ◽  
Hot Pressing ◽  
Weight Ratio ◽  
High Energy ◽  
Milling Process ◽  
High Energy Ball Milling ◽  
Wet Milling ◽  
Powder Mixtures ◽  
Energy Ball ◽  
Steel Balls

This work presents the results on the high-energy ball milling and hot pressing of Ni-48Ti-2Sn and Ni-45Ti-5Sn (at-%) powder mixtures. The milling process was performed in a planetary ball mill using stainless steel vial (225 mL) and hardened steel balls (19 mm diameter), rotary speed of 300 rpm, and a ball-to-powder weight ratio of 10:1. Samples were collected into the vial after different milling times: 60, 180 and 300 min. In the sequence, wet milling (isopropyl alcohol) was adopted up to 720 min in order to increase the powder yield into the vials. The as-milled and hot-pressed samples were characterized by X-ray diffraction, electron scanning microscopy, and energy dispersive spectrometry. Results indicated that the ductile particles were promptly cold-welded during the initial milling times. XRD patterns of the Ni-48Ti-2Sn powder mixture indicated that the peaks of Ni, Ti and Sn disappeared after milling for 3h. Following, peaks of NiTi and Ni4Ti3were preferentially formed during milling of Ni-Ti-Sn powders. A large amount of fine powders was yielded into the vial after wet milling for 720 min only. No significant carbon or oxygen contamination was detected by EDS analysis. Hot pressing produced homogeneous and dense samples which presented microstructures containing a large amount of the NiTi compound.

High Strength Bulk Nanostructured 2219 Al Alloy Produced by High Energy Ball Milling and Hot Pressing

2008 ◽  
Vol 584-586 ◽  
pp. 97-101 ◽  
Author(s):  
T. Shanmugasundaram ◽  
V. Subramanya Sarma ◽  
B.S. Murty ◽  
Martin Heilmaier
Keyword(s):  
Mechanical Properties ◽  
Ball Milling ◽  
Hot Pressing ◽  
Xrd Analysis ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Coarse Grained ◽  
Nanocrystalline Powders ◽  
Al Alloy ◽  
Energy Ball

The microstructure and mechanical properties of nano-crystalline 2219 Al alloy (Al-6.4Cu-0.29Mn, all in wt %) was studied. Nanocrystalline powders were produced from gas atomized 2219 Al alloy powders by high energy ball milling at room temperature. Powders were collected at different milling times and X-ray diffraction (XRD) analysis was used to evaluate grain size. High Vickers hardness (250HV), high compressive strength (920 MPa) and low ductility (2%) were observed in unimodal bulk nanostructured 2219 Al alloys consolidated to 99% density by hot pressing (HP). In addition, these nanocrystalline powders were blended with 15, 30 and 50% of (gas atomized) coarse-grained powders to obtain balanced mechanical properties of enhanced yield and ultimate strength and reasonable ductility and toughness as compared to either conventional or nanocrystalline 2219 alloys.

Preparation of Ni-Ti-Mo and Ni-Ti-Mo-Zr Alloys by High-Energy Ball Milling and Subsequent Hot Pressing

2012 ◽  
Vol 727-728 ◽  
pp. 233-238
Author(s):  
Gilda Maria Cortez Pereira ◽  
Marisa Aparecida de Souza ◽  
Tomaz Manabu Hashimoto ◽  
Vinicius André Rodrigues Henriques ◽  
Alfeu Saraiva Ramos
Keyword(s):  
Ball Milling ◽  
Hot Pressing ◽  
Weight Ratio ◽  
Graphite Crucible ◽  
High Energy ◽  
Milling Process ◽  
High Energy Ball Milling ◽  
Energy Ball ◽  
Rotary Speed ◽  
Steel Balls

This work discusses on the preparation of Ni-45Ti-5Mo, Ni-40Ti-10Mo and Ni-46Ti-2Mo-2Zr (at-%) alloys by high-energy ball milling and hot pressing, which are potentially attractive for dental and medical applications. The milling process was performed in stainless steel balls (19mm diameter) and vials (225 mL) using a rotary speed of 300rpm and a ball-to-powder weight ratio of 10:1. Hot pressing under vacuum was performed in a BN-coated graphite crucible at 900°C for 1 h using a load of 20 MPa. The milled and hot-pressed materials were characterized by X-ray diffraction, electron scanning microscopy, and electron dispersive spectrometry. Peaks of B2-NiTi and Ni4Ti3were identified in XRD patterns of Ni-45Ti-5Mo, Ni-40Ti-10Mo and Ni-46Ti-2Mo-2Zr powders milled for 1h. The NiTi compound dissolved small Mo amounts lower than 4 at%, which were measured by EDS analysis. Moreover, it was identified the existence of an unknown Mo-rich phase in microstructures of the hot-pressed Ni-Ti-Mo alloys.

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