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Displaying 226 - 250 of 1719

Duality of Dislocation Content of Grain Boundaries

February 19, 2017
Author(s)
John W. Cahn, Yuri Mishin, A Suzuki
The Frank-Bilby equation (FBE) can give many solutions for the dislocation content of a grain boundary (GB); most of them are considered to have little physical reality except in limited ranges of the angles which characterize low-angle GBs. We explore two

Effect of Colloidal Probe Random Surface Features on Adhesion

February 19, 2017
Author(s)
Seung H. Yang, Stephen M. Hsu
We have uncovered the fact that colloidal probes often have random surface features which when not properly accounted for, can significantly affect the magnitudes of the measured adhesive forces using atomic force microscopes (AFM). Colloidal probes have

Effect of Wear Track Diameter on Tribological Behavior

February 19, 2017
Author(s)
S Jahanmir
Wear tests were conducted using a pin-on-disk tribometer to evaluate the effect of disk track diameter on the tribological behavior. High purity alumina balls were used as pins sliding against glass-ceramic (IPS empress 2) disks under distilled water

Effects of Large Grains on Transgranular Fracture Toughness

February 19, 2017
Author(s)
Stephen W. Freiman
This paper addresses issues of fracture for materials in which large grains, exist in a matrix of much smaller grains. Materials used for optical components, such as ZnS and ZnSe frequently fall into this category. For materials of this sort failure can

Effects of Polarity on Grain Boundary Migration in ZnO

February 19, 2017
Author(s)
Jong S. Lee, Sheldon M. Wiederhorn
Boundary migration of ZnO has been investigated using single crystals with defined crystallographic orientations. The migration rate of the basal C planes depended on the crystallographic polarity: Zn-terminated positive (0001)-planes. The migration in the

Enviromental Concerns Facing the Ceramics Industry

February 19, 2017
Author(s)
Stephen W. Freiman
Over the past few years, there has been increased attention paid by ceramic manufacturers in the United States to environmental issues facing their businesses. In a recent survey of its members, the environment was identified as the primary issue facing

Experts Evaluate Pulsed Laser Deposition Technology

February 19, 2017
Author(s)
John W. Hastie, D W. Bonnell, D Chrissey
The National Institute of Standards and Technology (NIST, Gaithersburg, MD) and The Naval Research Laboratory (NRL, Washington, DC) jointly hosted a workshop entitled Pulsed Laser Deposition (PLD) Technological Barriers: Research Needs and Opportunities

First-Principles Effective Hamiltonians for PbZrO 3

February 19, 2017
Author(s)
Eric J. Cockayne
The phase transformation behavior and physical properties of the technologically important PbZr 1-xTi xO 3 (PZT) solid solution series are of great interest. For example, the large piezoelectric response of PZT (x = 0.45) makes this compound suitable for

Glass forming liquids and polymers: what we learn from statistical physics

February 19, 2017
Author(s)
S C. Glotzer, Y Gebremichael, N Lacevic, T B. Schroder, Francis W. Starr
We describe the application of statistical mechanical framework, originally developed to describe critical phenonema, to the problem of dynamic criticality associated with the glass transition of various materials.

Gravitational Effects on Mercuric Iodide Crystal Growth

February 19, 2017
Author(s)
B W. Steiner, L van den Berg, U Laor
Gravity can affect the physical vapor growth of mercuric iodide in two distinct ways. First, gravity will induce convection during growth, which strongly mixes residual impurities and any elementary gases resulting from imperfect stoichiometry, either of

Green Body Density Measurement Techniques

February 19, 2017
Author(s)
P Pei, J Anderson, M C. Bhardwaj, Dennis B. Minor, T Thornton
Green body density measurement techniques were investigated and compared. The measurement techniques investigated include mass-volume measurement, mercury pycnometry, powderdisplacement pycnometry, and noncontact ultrasonic method. Samples studied include

Habits of Grains in Dense Polycrystalline Solids

February 19, 2017
Author(s)
D M. Saylor, B S. El-Dasher, Y Pang, H M. Miller, P Wynblatt, Anthony D. Rollett, G S. Rohrer
Three-dimensional interfacial networks in polycrystalline solids are topologically and crystallographically complex. With a few notable exceptions, most of what we know about the distribution of three-dimensional grain shapes has been derived from foams or

Hierarchical Roughness Makes Superhydrophobic States Stable

February 19, 2017
Author(s)
Michael Nosonovsky, Bharat Bhushan
Roughness enhances hydrophobicity of a solid surface leading to high contact angles with water. To achieve low contact angle hysteresis along with a high contact angle, superhydrophobic surfaces should form composite interface (CI) with air pockets in the

High Performance Tribology Systems: Design Consideration

February 19, 2017
Author(s)
Stephen M. Hsu
Since the 1980s, the pace of technology innovations has accelerated exponentially. The advent of high efficiency yet environmental friendly diesel engine technology, micro-electro-mechanical devices (MEMs), better and more durable biomaterials, and ever
Displaying 226 - 250 of 1719