Preparation and mechanical properties of nanoquasicrystalline base bulk alloys

2001 ◽  
Vol 44 (8-9) ◽  
pp. 1615-1619 ◽  
Author(s):  
A Inoue ◽  
T Zhang ◽  
S Ishihara ◽  
J Saida ◽  
M Matsushita
Keyword(s):  
Mechanical Properties ◽  
Bulk Alloys

Development Of High-Strength Aluminum-Based Alloys By Synthesis Of New Multicomponent Quasicrystals

1998 ◽  
Vol 553 ◽  
Author(s):  
A. Inoue ◽  
H. M. Kimura
Keyword(s):  
Mechanical Properties ◽  
Powder Metallurgy ◽  
Rapid Solidification ◽  
Future Development ◽  
High Strength ◽  
Supercooled Liquid ◽  
Engineering Properties ◽  
Atomic Configuration ◽  
Lanthanide Metal ◽  
Bulk Alloys

AbstractBy the control of composition, clustered atomic configuration and stability of the supercooled liquid in the rapid solidification and powder metallurgy processes, high-strength Al-based bulk alloys containing nanoscale nonperiodic phases were produced in AI-Ln-LTM, AI-ETM-LTM and Al-(V, Cr, Mn)-LTM (Ln=lanthanide metal, LTM=VII and VIII group metals, ETM=IV to VI group metals) alloys containing high Al contents of 92 to 95 at%. The nonperiodic phases are composed of amorphous or icosahedral (I) phase. In particular, the Al-based bulk alloys consisting of nanoscale I particles surrounded by Al phase exhibit much better mechanical properties as compared with commercial Al base alloys. The success of producing the Al-based alloys with good engineering properties by use of I phase is important for future development of I-based alloys as practical materials.

Structure and mechanical properties of cast quasicrystal-reinforced Mg–Zn–Al–Y base alloys

2004 ◽  
Vol 19 (5) ◽  
pp. 1531-1538 ◽  
Author(s):  
Guangyin Yuan ◽  
Kenji Amiya ◽  
Hidemi Kato ◽  
Akihisa Inoue
Keyword(s):  
Mechanical Properties ◽  
Elevated Temperatures ◽  
Cast Alloy ◽  
Strengthening Mechanism ◽  
Icosahedral Quasicrystal ◽  
Compression Tests ◽  
Strengthening Phase ◽  
Creep Tests ◽  
Cast Alloys ◽  
Bulk Alloys

The structure and mechanical properties of Mg–Zn–Al–Y base cast alloys containing an icosahedral quasicrystal phase (i-phase) as a main strengthening phase were investigated. Mg–8Zn–4Al–xY base bulk alloys containing the i-phase were prepared by casting into a copper mold at moderate cooling rates. The Y addition was effective for decreasing the size of the i-phase and the increasing the homogeneity of its dispersed state. The mechanical properties examined by compression tests at room temperature were much superior to those of a conventional AZ91 Mg alloy. The creep tests at elevated temperatures indicated a promising high temperature creep resistance of the quasicrystal-reinforced Mg–Zn–Al–Y cast alloy. The strengthening mechanism was also discussed.

scholarly journals Effects of In Content on the Microstructure and Mechanical Properties of In–Bi Alloys During Isothermal Aging

Metals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 548
Author(s):  
Sanghun Jin ◽  
Omid Mokhtari ◽  
Shutetsu Kanayama ◽  
Hiroshi Nishikawa
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Thermal Aging ◽  
Isothermal Aging ◽  
Tensile Tests ◽  
Melting Temperatures ◽  
Microstructure And Mechanical Properties ◽  
Ductile Fractures ◽  
Fracture Surface Analysis ◽  
Bulk Alloys

Bulk In–Bi binary alloys with 50, 40, 33.7, and 30 mass% Bi and low melting temperatures were prepared and aged at 40 °C for 168, 504, and 1008 h in an oil bath. Tensile tests were performed on the bulk alloys, followed by fracture surface analysis of the tensile test samples. The effect of In content on the microstructures and mechanical properties of the alloys during thermal aging was analyzed. Ultimately, the tensile strength of the In–Bi alloys was found to decrease with aging time, while the elongation of the In–Bi alloys increased after thermal aging. The results of the tensile tests indicate that a higher In content improved the ductility of the In–Bi alloys significantly and reduced their strength. In addition, the fracture surfaces exhibited ductile fractures in the neck shapes. A comparative analysis of the microstructure and mechanical properties of the aforementioned alloys during thermal aging was also conducted.

Double Inhibitory Actions on WC Grains of Microwave Sintered WC-12wt%Co-VC Alloy

2015 ◽  
Vol 816 ◽  
pp. 715-721 ◽  
Author(s):  
Rui Bao ◽  
Jian Hong Yi ◽  
Jia Min Zhang ◽  
Yi Chun Liu ◽  
Feng Xian Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Positive Impact ◽  
Rupture Strength ◽  
Microwave Sintering ◽  
Inhibitory Effects ◽  
Microwave Exposure ◽  
Microstructure Observation ◽  
Average Grain Size ◽  
Bulk Alloys ◽  
Sintering Method

It is well known that grain-refinement has a positive impact on the mechanical properties of WC-Co cemented carbide. The effect of VC inhibitor and microwave on density, microstructure and mechanical properties of the sintered WC–12wt%Co alloy was investigated in the present study. The ball milled WC-12wt%Co-xVC composites were compressed and fabricated by using microwave sintering method. The experimental results indicate that the microwave sintering cycle was significantly shorter to that of vacuum processing, and the density of bulk alloys increased with VC inhibitor contents and microwave sintering temperatures. Moreover, the microstructure observation of the sintered samples suggests that VC inhibitor had prominent inhibitory action on WC grains in microwave exposure, and the WC average grain size of alloy with 0.7wt%VC inhibitor was 0.43μm when the sintering temperature reached 1420°C. It is also evident that WC-12wt% alloys with an appropriate proportion of VC inhibitor exhibited higher hardness (92.1HRA) and better transverse rupture strength (2380MPa). And finally the mechanism of inhibitory effects on WC grains under microwave irradiation was discussed.

Magnetic and mechanical properties of (Fe, Co)–Pt bulk alloys prepared through various processing techniques

2002 ◽  
Vol 91 (10) ◽  
pp. 8810 ◽  
Author(s):  
S. Saha ◽  
C. J. Thong ◽  
M. Q. Huang ◽  
R. T. Obermyer ◽  
B. J. Zande ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Processing Techniques ◽  
Bulk Alloys

Effect of Chemical Plating with Ni Content on Thermoelectric and Mechanical Properties of P-Type Bi0.5Sb0.15Te3 Bulk Alloys

2016 ◽  
Vol 847 ◽  
pp. 177-183 ◽  
Author(s):  
Xue Ting Dai ◽  
Yuan Yu ◽  
Fang Qiu Zu ◽  
Zhong Yue Huang
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Seebeck Coefficient ◽  
Hot Pressing ◽  
Sintering Process ◽  
Chemical Plating ◽  
Ni Content ◽  
Maximum Value ◽  
P Type ◽  
Bulk Alloys

In this work, Bi0.5Sb1.5Te3 powders were coated with various nickel (Ni) contents by chemical plating, and then consolidated into bulk by hot pressing. The results show that Ni particles uniformly coat on the surface of powders and then transform into NiTe2 during the sintering process, after that NiTe2 mainly concentrated at the grain boundaries of bulk. With Ni content increasing, the resistivity of bulk samples and Seebeck coefficient decreased rapidly while thermal conductivity increased. The maximum value of ZT for Bi0.5Sb1.5Te3/Ni sample with 1wt.% Ni is 0.55. Moreover, due to the excellent ductility of Ni that can act as lubricant and binder during the hot pressing process, making the mechanical properties (hardness) of bulks elevated with Ni content increasing. This work suggests that chemical plating technology can improve the mechanical properties and impact the thermoelectric properties of thermoelectric materials. With further tuning the type and content of coating elements, the thermoelectric performance can be improved prospectively.

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