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"Yield strength anomaly evaluation of W-free Co-Ni-Al-based superalloys" by Hang Shang, Qingshuang Ma et al.

High temperature tensile behaviors of two W-free Co-Ni-Al-based γ'-strengthened superalloys at 773 K ~ 1073 K were investigated. The tensile strength and elongation of two superalloys decrease with increasing temperature. The fracture mechanism changes from dimple fracture to brittle fracture. A detailed observation of the fracture shows that the intermediate temperature embrittlement caused by decohesion of slip plane plays a significant role in reducing high temperature performance. Both superalloys reach to peak yield strength at 923 K. Occurance of yield strength anomaly (YSA) is derived from the synergistic effects of dislocation locking strengthening and dynamic strain aging strengthening. Dislocation cross-slipping hinders the dislocation migration. Dislocations' unpinning to the moving solutes increases the yield strength at 723 K ~ 973 K. A rapid weakening of grain boundaries strength decreases the yield strength at 1073 K. ....

W Free Co Ni Al Based , Co Ni Al Based Superalloy , Deformation Behavior , Tensile Properties , Ield Strength Anomaly ,

University Libraries Research Awards honor 100 students from 19 campuses

Penn State University Libraries presented its fourth annual Undergraduate Research Award: Excellence in Information Literacy honors to 100 students at nearly all undergraduate Penn State campuses. Awards recognized 96 current undergraduate students and recent graduates, four graduate students, plus two additional College of Medicine students and two collaborating faculty ....

United States , Al Iskandariyah , United Kingdom , College Of Medicine , Al Qahirah , Penn State University , Lititz Run , Casey Falcon , Bailey Keller , Michel Nafash , Jared Haldeman , Fath Stevenson , Chelsea Spatara , Yuval Silberman , Hunter Haggett , Hailley Fargo , Nicholas Cain , Kevin Shen , Megan Lucey , Haojun Li , Arisha Tariqu , Logan Vogelsong , Sidney Buckman , Kimlyn Patishnock , Shea Tyler , Tamia Lopez ,

Mehmet Hakki Alma - Editorial Board - Scientific Research Publishing


1991 M.Sc., Department
of Industrial Engineering of Forestry, Black Sea Technical University, Turkey
1988 B.Sc., Department of Industrial Engineering of
Forestry, Black Sea Technical University, Turkey
Publications (selected)
Efe, FT Alma, MH, 2014. Investigating Some Physical
Properties of Composite Board, Produced from Sunflower Stalks, Designed
Horizontally, Ekoloji, 23 (90): 40-48.
Alma M. H.; Acemioğlu, B. (2003): A Kinetic Study of
Sulfuric-Acid-Catalyzed Liquefaction of Wood into Phenol Chemical Engineering
Communications . 191: 969-980.
Alma, M.H.; Basturk M. A.; Dıgrak M. (2003): New
Polyurethane-Type Rigid Foams From Liquified Wood Powders Journal of Materıals
Scıence Letters 22, 1225 –1228.
Bektaş, I; Alma M. H.; As, N.; Gundoğan R. (2003): ....

Phenloated Wood , Hakki Alma , Holz Roh , Mokuzai Gakkaishi , Tensile Properties , Kyoto University , Sea Technical University , Flow Properties , Department Of Industrial Engineering Forestry , University Of Kahramanmaras Sutcu Imam , Properties Of Composite Board , Department Of Industrial Engineering , Kahramanmaras Sutcu Imam , Industrial Engineering , Black Sea Technical University , Some Physical , Composite Board , Sunflower Stalks , Kinetic Study , Sulfuric Acid Catalyzed Liquefaction , Phenol Chemical Engineering , Relationship Between Site , Several Mechanical Properties Of Turkish , Molecular Beam Spectrometry , Bark Phenolysis Products , Applied Polymer ,