منابع مشابه
Nucleation of Austenite in Mechanically Stabilized Martensite by Localized Heating
The nucleation of bcc austenite in a single crystal of a mechanically stabilized 2H-martensite of Cu-Al-Ni shape-memory alloy is studied. The nucleation process is induced by localized heating and observed by optical microscopy. It is observed that nucleation occurs after a time delay and that the nucleation points are always located at one of the corners of the sample (a rectangular bar in the...
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A major portion of BaSO4 is used as drilling fluid additives in the presence of some biopolymers such as starch and PAC (Polyanionic Cellulose) as filtration control and viscosifier. BaSO4 nanoparticle was synthesized in the presence of these applicable polymers with precipitation method by using BaS produced from carbothermal method and Na2SO4. Synthesized nanoparticles size and morphology wer...
متن کاملMechanism of misorientation development within coalesced martensite
Coarse crystals of martensite can form by the coalescence of thin individual platelets of martensite under appropriate circumstances. Although these coarse grains are essentially single crystals, there exist significant orientation gradients across their dimensions. It is demonstrated that these gradients arise because of the plasticity induced in austenite due to the transformation strain asso...
متن کاملNucleation and Growth of the Ni5Al3 Phase in Ni-Al Austenite and Martensite
The nucleation and growth mechanisms of Ni5A13 precipitates and microtwinned plates in B2 austenite and 2M (3R) martensite phases are described on the basis of conventional and high resolution electron microscopy. In the Ni62.5A137.5 B2 austenite matrix short annealings at 550°C introduce three-pointed star shaped precipitates consisting of twin related parts of different variants of the Ni5A13...
متن کاملAn empirical technique for prediction of nucleation mechanism and interfacial tension of potassium chloride nanoparticles
Prediction of the nucleation mechanism is one of the most critical factors in the design of a crystallization system. Information about the nucleation mechanism helps to control the size, shape, size distribution, and purity of the produced crystals. When the crystallization method is used for producing nanoparticles, the nucleation mechanism should be predicted. In this study, an empirical cor...
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ژورنال
عنوان ژورنال: Materials Transactions, JIM
سال: 1991
ISSN: 0916-1821,2432-471X
DOI: 10.2320/matertrans1989.32.114