Coercivity of Melt-Spun Nd–Fe–B–Ti Alloys with Large Volume Fraction of Free-Iron Dispersoid

1994 ◽  
Vol 33 (Part 1, No. 6A) ◽  
pp. 3443-3447 ◽  
Author(s):  
June-Min Yao ◽  
Tsung-Shune Chin ◽  
Cheng-Hao Lin ◽  
Tsung-Yao Chu
Keyword(s):  
Large Volume ◽  
Volume Fraction ◽  
Free Iron ◽  
Large Volume Fraction ◽  
Ti Alloys ◽  
Melt Spun

Formation of Light-weight Low-density Materials via Gas Phase Aerosol Gelation

2011 ◽  
Vol 1306 ◽  
Author(s):  
Christopher M. Sorensen ◽  
Rajan Dhaubhadel ◽  
Corey S. Gerving ◽  
Amitabha Chakrabarti
Keyword(s):  
Liquid Phase ◽  
Gas Phase ◽  
Large Volume ◽  
Volume Fraction ◽  
Sol Gel ◽  
Low Density ◽  
Light Weight ◽  
Large Volume Fraction ◽  
Explosive Combustion

ABSTRACTWe have demonstrated that gas phase explosive combustion can lead to nanoparticle aerosols with sufficiently large volume fraction to cause a volume spanning gel to form on the order of ten’s of seconds. The term “aerosol gel” was coined to name these materials. So far we have made aerosol gels of carbon and silica. These aerosol gels are similar to well-known, liquid-phase, sol-gel synthesized aerogels.

Strength and plasticity improvement of AZ31 sheet by pre-inducing large volume fraction of {10–12} tensile twins

2020 ◽  
Vol 776 ◽  
pp. 139045
Author(s):  
Huihui Nie ◽  
Xinwei Hao ◽  
Xiaoping Kang ◽  
Hongsheng Chen ◽  
Chengzhong Chi ◽  
...  
Keyword(s):  
Large Volume ◽  
Volume Fraction ◽  
Large Volume Fraction ◽  
Az31 Sheet ◽  
Strength And Plasticity

Investigation of the microstructure effect on the magnetoresistance of heterogeneous Au1-xCox melt-spun ribbons

1994 ◽  
Vol 52 ◽  
pp. 896-897
Author(s):  
A. Hütten ◽  
J. Bernardi ◽  
S. Friedrichs ◽  
G. Thomas
Keyword(s):  
Giant Magnetoresistance ◽  
Volume Fraction ◽  
Multilayered Structures ◽  
Microstructural Parameters ◽  
Large Volume Fraction ◽  
Melt Spun ◽  
Atomic Scattering ◽  
Melt Spun Ribbons ◽  
Matrix Concentration ◽  
Microstructure Effect

Giant magnetoresistance (GMR) of up to 65% at room temperature has been achieved in Cu/Co multilayers, far exceeding the 2.5% arising from permalloy, which is presently used in magnetoresistive read heads. The GMR effect is not restricted to multilayered structures only and has been also discovered in heterogeneous CulxCox thin films. At present, experimentally determined and statistically significant microstructural parameters, e.g., Co particle size distribution, composition of Co particles and Co matrix concentration, are still not available for Cu1-xCox films or melt-spun ribbons because of two reasons. First, the small difference in atomic scattering factors of Cu and Co and secondly, the Ashby-Brown contrast, which is expected for coherent precipitates, is not observed. The large volume fraction of Co precipitates results in overlap and cancellation of their strain fields. To overcome limitations in imaging Co precipitates, melt-spun AU1-xCox ribbons have been investigated regarding their GMR. AuCo has a similar phase diagram (Fig. 1) compared with CuCo, but it has the advantage of a large difference in atomic scattering factors of Au and Co. As a consequence Co-rich precipitates can be directly identified by their mass contrast.

Mechanism of Large Elastic Modulus of Bone

2011 ◽  
Vol 689 ◽  
pp. 390-394 ◽  
Author(s):  
Bin Chen ◽  
Da Gang Yin ◽  
Ji Luo ◽  
Quan Yuan ◽  
Jing Hong Fan
Keyword(s):  
Electron Microscope ◽  
Elastic Modulus ◽  
Scanning Electron Microscope ◽  
Large Volume ◽  
Volume Fraction ◽  
Thin Fiber ◽  
Sem Observation ◽  
Large Volume Fraction ◽  
Composite Mechanics ◽  
Scanning Electron

Scanning electron microscope (SEM) observation shows that fibula bone is a kind of bioceramic composite consisting of hydroxyapatite layers and protein matters. The hydroxyapatite layers are further composed of hydroxyapatite sheets. The observation also shows that the hydroxyapatite sheets possess quite large volume fraction and also have very long and thin fiber shape. The mechanism of the large volume fraction of the hydroxyapatite sheets to ensure the larger elastic modulus of the bone was investigated based on the model of the bone composite and the theory of the composite mechanics. The investigated result reveals that the large volume fraction of the hydroxyapatite sheets endows the bone with large elastic modulus.

Investigation on Microstructures of Heat Treated Mg-Zr and Mg-Mn Alloys

2005 ◽  
Vol 488-489 ◽  
pp. 189-192 ◽  
Author(s):  
Jian Ping Li ◽  
Gordon W. Lorimer ◽  
Joseph D. Robson ◽  
B. Davis
Keyword(s):  
Large Volume ◽  
Fine Particles ◽  
Volume Fraction ◽  
Solution Treatment ◽  
Weight Percent ◽  
Large Volume Fraction ◽  
Heat Treated ◽  
Different Temperatures ◽  
Mn Content ◽  
Zr Alloys

The microstructure of three dilute Mg-Mn and two dilute Mg-Zr alloys which had been heat treated at different temperatures and times were studied using optical microscopy and various electron optical techniques, including FEGSEM and TEM. It was found that the Mg-Zr alloys homogenized at 500°C and annealed at 350°C contained a fine dispersion of Zr-containing particles at grain boundaries and within grains. In contrast, annealing Mg-Zr alloys at 300°C for up to 3 h led to little modification of the as-cast structures. When the Mn content was less than 0.9 weight percent, homogenization of the Mg-Mn alloys at 550 to 600°C resulted in the dissolution of small rod-like and needle-shape particles, which then grown up as fine particles when aged at 300°C. Mg- 0.6Mn and Mg-0.9Mn alloys annealed at 300 to 400°C without solution treatment contained a large volume fraction of nano-sized precipitates.

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