scholarly journals Analisis Sifat Mekanik dan Struktur Mikro Aluminium Scrap (ADC12) Menggunakan Tungku Listrik

2020 ◽  
Vol 17 (2) ◽  
pp. 184
Author(s):  
Syaharuddin Rasyid ◽  
Arthur Halik Razak ◽  
Fahmi Fahmi ◽  
Diah Ayu Lestari ◽  
Abd. Karim M
Keyword(s):  
Grain Size ◽  
Melting Temperature ◽  
Testing Procedure ◽  
Temperature Data ◽  
Holding Time ◽  
Microstructural Properties ◽  
Hardness Testing ◽  
Aluminum Scrap ◽  
Research Procedure ◽  
Mechanical And Microstructural Properties

Knowing the mechanical and microstructural properties of aluminum scrap materials found in casting using an electric furnace. The research procedure included temperature data (750oC, 800oC, 850oC) and smelting time for 120 minutes. Hardness testing procedure is carried out to get the hardness value from some casting result areas. Microstructure is characterized by a comparison of the grain size of the metal that has undergone casting, to measure the grain size in this study using the image J program. The highest hardness value shows the melting temperature of 800oC with a temperature holding time of 120 minutes of 63.8HB. The longer the temperature holding time, the hardness value will increase. The smallest grain size occurs at a melting temperature of 800oC with a temperature holding time of 120 minutes of 21µm.

scholarly journals Additive manufacturing of high-strength multiphase nanostructures in the binary Ni–Nb system for the discovery of new types of superalloys

2021 ◽  
Vol 36 (16) ◽  
pp. 3167-3181
Author(s):  
M. R. Jones ◽  
F. W. DelRio ◽  
J. W. Pegues ◽  
P. Lu ◽  
R. Puckett ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Additive Manufacturing ◽  
High Strength ◽  
Lamellar Spacing ◽  
Refractory Element ◽  
Dual Phase ◽  
Microstructural Properties ◽  
Mechanical And Microstructural Properties ◽  
Uniform Composition

Abstract Ni-based superalloys have been studied extensively due to their impressive mechanical properties, including strength and creep resistance at high temperatures. Growing interest surrounding additive manufacturing (AM) methods has led to recent investigations of alloys that are traditionally difficult to process, including Ni-based superalloys. Recent work has shown that AM methods enable high-throughput materials discovery and optimization of difficult- or impractical-to-process alloys, including those with high or even majority refractory element compositions. This work focuses on AM-enabled investigations of composition-dependent mechanical and microstructural properties for Ni–Nb binary alloys. Specifically, we report on the mechanical behavior of compositionally-graded NixNb1−x and uniform composition Ni59.5Nb40.5 specimens made with AM. The AM fabrication process resulted in extraordinarily high strength, attributed to the formation of a dual-phase microstructure consisting of δ-Ni3Nb and µ-Ni6Nb7 intermetallic compounds with nanostructured and multimodal grain size and eutectic lamellar spacing. Graphic Abstract

Evaluating Micro-Structure, Hydration and Thermal Expansions of Cement Containing Nano-Silica

GIS Business ◽  
2020 ◽  
Vol 15 (1) ◽  
pp. 158-165 ◽  
Author(s):  
Dr. Sarvesh PS Rajput
Keyword(s):  
Portland Cement ◽  
Mechanical Characteristics ◽  
Microstructural Properties ◽  
Nano Silica ◽  
Micro Structure ◽  
Microstructural Characteristics ◽  
Mechanical And Microstructural Properties

This study reported that the addition of nano-silica enhances the mechanical characteristics of concrete as its compressive, flexural and tensile split strengths are increased. As a comparison mixture to equate it along with nano-modified concrete, ordinary samples of Portland cement (OPC) have been utilized. Herein, upto 6.0 percent of OPC has been substituted by nanosilica. In fact, the introduction of nanosilica improves mechanical and microstructural characteristics of concrete by significantly (28 to 35%). The finding therefore, indicated that partly replacing OPC with up to 5 percent nanosilica increases the mechanical and microstructural properties cured up to ninety days as opposed to the standard OPC mix.

scholarly journals Comparison of Some Physical Parameters of Whole and Scored Lisinopril and Lisinopril/Hydrochlorthiazide Tablets

2008 ◽  
Vol 8 (4) ◽  
pp. 391-395 ◽  
Author(s):  
Edina Vranić ◽  
Alija Uzunović
Keyword(s):  
Large Scale ◽  
Testing Procedure ◽  
Physical Parameters ◽  
Hardness Testing ◽  
Disintegration Time ◽  
Adequate Dose ◽  
Response Information ◽  
Tablet Splitting ◽  
Good Patient Compliance ◽  
Accepted Practice

Tablets are one of the most popular and preferred solid dosage forms because they can be accurately dosed, easily manufactured and packaged on a large scale, have good physical and chemical stability, and can contribute to good patient compliance given their ease of administration. The ability to match doses to patients depends on the availability of multiple dose sizes and adequate dose-response information. These are not always provided, so splitting of the tablets is sometimes necessary, Tablet splitting is an accepted practice in dispensing medication, It has been used when a dosage form of the required strength is not available commercially. The aim of our study was to compare some physical parameters of whole and scored lisinopril and lisinopril/hydrochlorthiazide tablets and to accept or exclude their influence on the obtaining of required dosage.According to the results obtained, we may conclude that tablets from batch “I” “IL “III” and “IV” satisfied pharmacopeial requirements concerning crushing strength, friability, disintegration time and mass uniformity. The hardness testing showed acceptable reproducibility and indicate that the data variation was primarily from the irreversible changes in the structure of tablet samples. The act of compacting powders stores energy within the tablets, by shifting or compressing the intermolecular bonds within the particles. The tablets have a natural tendency to relax once pressure is removed, and this tendency works against the interparticle bonding formed during compression. Hardness testing procedure causes irreversible changes in this structure.

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