Process Dependence of Microstructure and Properties of Sintered Aluminum Nitride for Electronic Packaging

1992 ◽  
Vol 264 ◽  
Author(s):  
I. Dutta ◽  
S. Mitra ◽  
J. Cooper
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Aluminum Nitride ◽  
Treatment Condition ◽  
Heat Treatment Condition ◽  
Boundary Phase ◽  
Secondary Phases ◽  
Treatment Conditions ◽  
Sintered Aluminum ◽  
Sintered Product

AbstractThe development of secondary phases due to additions of Y2O3 during sintering of aluminum nitride was studied. Depending on the heat treatment conditions and the amount of Y2O3 added, different proportions of AlYO3, Al5Y3O12 and Al2Y4O9 were found at the grain boundaries. Temperatures ≳1850°C also resulted in loss of Y2O3 and/or Y-aluminate, yielding some γAl2O3. The mechanical properties and the thermal conductivity of the sintered product were observed to be dependent on the grain boundary phase constitution and hence the specific heat treatment condition.

Comparative investigations of cryo-treated and untreated inserts on machinability of AISI 1050 by using response surface methodology, ANOVA and Taguchi design

2021 ◽  
pp. 095440622110231
Author(s):  
Şehmus Baday ◽  
Onur Ersöz
Keyword(s):  
Heat Treatment ◽  
Surface Roughness ◽  
Response Surface Methodology ◽  
Cutting Force ◽  
Treatment Condition ◽  
Chip Morphology ◽  
Cutting Parameters ◽  
Heat Treatment Condition ◽  
Mixed Design ◽  
Treatment Conditions

This study aims to focus on the machinability of the AISI 1050 workpieces with cutting inserts, treated under deep cryogenic heat (−146 °C), and with untreated ones, and to investigate the optimization of cutting parameters and heat treatment conditions for surface roughness and cutting force by using Taguchi mixed design and Response Surface Methodology (RSM). The machining experiment was performed on a CNC lathe with machining parameters such as three feed rates, three cutting speeds and a constant depth of cut under dry condition and with heat treatment condition. As is known, Taguchi design L18 (32 21) consists of three factors; cutting parameters with each one of three levels and heat treatment condition with two levels. The results of machining tests were evaluated considering surface roughness, vibrations and cutting force. Furthermore, chip morphology and wear led by cryo-treated and untreated inserts were detected with the aid of a scanning electron microscope. The results demonstrated that cryo-treated (CTI) insert had lower tool wear, vibration, and cutting force than untreated insert (UI) in all conditions. In aspect of chip morphology, untreated inserts had bigger and larger serrations than the treated inserts. In addition, according to Taguchi S/N ratio, optimal cutting parameters and heat treatment conditions were obtained from CHT1, V3, and f1 for the Fc and from CHT1, V1, and f1 for the Ra, respectively. Also, the most significant control factors on surface roughness and cutting force were feed rate depending on ANOVA results and RSM. Validation test results demonstrated that RSM and Taguchi mixed design calculated the cutting force (R2RSM (CTI and UI) = 99.99% and R2Tag. = 99.95%) and surface roughness (R2RSM (CTI) = 99.76%, R2RSM (UI) = 99.59% and R2Tag. = 99.12%). Therefore, RSM and Taguchi mixed design predicts highly well match experimental data with prediction data.

Synthesis and Magnetic Properties of Nanocomposite Magnets Self-Organized from FeB-Nd-Nb Metallic Glasses

2008 ◽  
Vol 1118 ◽  
Author(s):  
R Tamura ◽  
S Kobayashi ◽  
T Fukuzaki ◽  
M Kamiko
Keyword(s):  
Heat Treatment ◽  
Metallic Glasses ◽  
Treatment Condition ◽  
Heat Treatment Condition ◽  
The Self ◽  
Quenching Rate ◽  
Glass Forming ◽  
Self Organized ◽  
Nanocomposite Magnets ◽  
Treatment Conditions

ABSTRCTChange of the magnetic property of Fe-B-Nd-Nb alloys was investigated with replacing Nb by a glass forming element Zr under constant quenching rate as well as heat treatment conditions. As a result, the coercivity significantly increases up to 1207 kA/m when the half of Nd is replaced by Zr, which is presumably due to grain refinement of the Nd2Fe14B phase. The self-organized nanograin magnets are attractive for future applications since their coercivity can be further improved by reducing the grain size via optimizing the Zr concentration, the quenching rate and the subsequent heat treatment condition.

Selective laser melting of AlSi10Mg alloy: influence of heat treatment condition on mechanical properties and microstructure

2018 ◽  
Vol 62 (4) ◽  
pp. 885-892 ◽  
Author(s):  
A. Iturrioz ◽  
E. Gil ◽  
M. M. Petite ◽  
F. Garciandia ◽  
A. M. Mancisidor ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Selective Laser Melting ◽  
Treatment Condition ◽  
Heat Treatment Condition ◽  
Laser Melting

THE EXPENDING RETROGRESSION TIME OF HOT-EXTRUDED Sc-CONTAINING Al–Zn–Mg–Cu ALLOY

2010 ◽  
Vol 17 (03) ◽  
pp. 293-298
Author(s):  
SUNG-YONG SHIM ◽  
DAE-HWAN KIM ◽  
YOUNG-ROCK SUNG ◽  
IN-SHUP AHN ◽  
SU-GUN LIM
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Electrical Conductivity ◽  
Treatment Condition ◽  
Heat Treatment Condition ◽  
Corrosion Properties ◽  
Cu Alloy ◽  
Study Results ◽  
Retrogression And Reaging ◽  
Mechanical Properties And Corrosion

In this paper, the retrogression and reaging (RRA) behavior and corrosion properties of Sc -containing Al–Zn–Mg–Cu alloy were observed. The dependence of the mechanical properties and corrosion resistance on the heat treatment condition was measured by hardness, tensile, C-ring and conductivity testing. The retrogression time for recovery of the yield strength of the alloy subjected to T6 treatment was 20 min at 200°C of retrogression temperature, which was longer than that of Al7075 alloy. The results of electrical conductivity and C-ring tests showed that the stress corrosion cracking (SCC) resistance in Sc -containing alloy treated for 20 min at 200°C was improved. These study results demonstrated the ability of the Sc -containing alloy to extend the retrogression time and thereby improve the SCC resistance and mechanical properties.

Study on the Heat–Treatment Reinforcement of Aluminum Nitride–Silicon Carbide Composites

1993 ◽  
Vol 327 ◽  
Author(s):  
Li Ningfang ◽  
Zhang Hongquan ◽  
Wang Guomei
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Silicon Carbide ◽  
Phase Composition ◽  
High Temperature ◽  
Grain Boundary ◽  
Aluminum Nitride ◽  
Phase Structure ◽  
Glass Phase ◽  
Boundary Phase

AbstractThe effects of heat – treatment on the mechanical properties of AIN – SiC whisker composites with Y2O3 and SiO2 additives has been studied. When the sample containing 10 wt% Y2O3 +SiO2 (Y2O3/SiO2= 1/0. 66) was treated at 1300°C in air for 140 hours the strength of compositqs was raised from 481 MPa to 784 MPa.The phase composition, microstructure and grain boundary phase structure have been characterized by combining XRD, SEM, TEM/EDXA and HREM techniques. The reinforcement mechanism of the composites results from crystallization of the glass phase in the grain boundary at the high temperature oxidizing atmosphere to form the crossing structure of 2Hδ Sialon fibrous phase and SiC whisker.

Effect of Solution Heat Treatment Conditions on the Mechanical Properties and Formability for AA 2024 Alloy

2014 ◽  
Vol 686 ◽  
pp. 3-9 ◽  
Author(s):  
Murat Dilmeç ◽  
Hüseyin Arıkan
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Solution Heat Treatment ◽  
Optimal Solution ◽  
Heat Treatment Condition ◽  
Solution Temperature ◽  
Dome Height ◽  
Treatment Conditions ◽  
2024 Alloy ◽  
Aa 2024

The properties of the heat-treatable aluminum alloys are enhanced by solution heat treatment and controlled ageing. The mechanical properties become stable with natural ageing at room temperature within a few days for some heat-treatable alloys, especially 2XXX series, considerable changes of the properties occur even after many years for some of them. Solution heat treatment of AA 2024 is very critical and sensible and therefore it should be carefully conducted. In this research, the effects of the solution temperature, soak time, quenching delay and heating rate of AA 2024 on the mechanical properties and the formability index (limiting dome height) were investigated in order to determine optimal solution heat treatment condition. Mechanical properties were determined and limiting dome heights of the formed parts were measured for all the situations and optimal solution heat treatment conditions were determined by using ANOVA method.

Effect of Heat Treatment on Properties and Structural Changes of Poly(p-Phenylene Benzobisoxazole) Fiber

2011 ◽  
Vol 391-392 ◽  
pp. 864-867 ◽  
Author(s):  
Bo Song ◽  
Ling Hui Ying ◽  
Xiao Yun Liu ◽  
Qi Xin Zhuang ◽  
Zhe Wen Han
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Treatment Condition ◽  
Structural Changes ◽  
Heat Treatment Condition ◽  
Molecular Chain ◽  
Temperature Level ◽  
Stress Direction ◽  
Pbo Fiber

The changes of structure and mechanical properties of poly(p-phenylene benzobisoxazole) (PBO) fibers with different heat-treatment condition involving temperature, level of tension and duration was investigated. The results revealed that the modulus of fibers was affected greatly by the heat treatment, while the strength of fiber was insensitive to the applied parameter during the heat treatment. It was also found that the heat treatment could promote the ring-close reaction of PBO molecules to completion and impelled the molecular chains to adjust and slide along the stress direction for further orientation, which could make the molecular chain more stretched, regularize the structure of PBO fibers and improve the mechanical properties of PBO fiber.

scholarly journals Effects of Heat Treatment Condition on the Mechanical Properties in Fe-0.4%C-2.3%Si Steel

2012 ◽  
Vol 32 (2) ◽  
pp. 104-108
Author(s):  
Je-Young Son ◽  
June-Hwan Song ◽  
Ji-Hun Kim ◽  
Byung-Joon Ye
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Treatment Condition ◽  
Heat Treatment Condition
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