Mechanical alloying of NiAl-based composites and cold sintering phenomenon

Journal Article · Thu Dec 01 04:00:00 EST 1994 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(94)90081-7· OSTI ID:6888116

Cheng, T ^[1]

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1. Beijing Inst. of Technology (China). Metal Materials Section Academia Sinica, Shenyang (China). International Centre for Materials Physics

Various approaches have recently been employed to improve mechanical properties of NiAl intermetallics at room temperature (RT) and high temperature (HT) respectively. However, some methods, such as refining grain size to improve RT brittleness and adding ceramic particles to enhance HT creep strength of the NiAl, may lead to contradictory results. It was pointed out that combining those two types of attempts or keeping the balance between the properties at RT and HT is very important for developing the NiAl as a new, high temperature structural material. Mechanical alloying (MA) can produce NiAl-based composites with a small grain size containing fine and homogeneously distributed oxides or other dispersions. This method can improve the toughness at RT and strength at HT of the NiAl at the same time if the following consolidation processing is adequately controlled so that the grain size, dispersion distribution and bonding with the matrix are appropriate. In this paper, the morphology, size and microstructures of MA NiAl-based composite powders, NiAl-TiB[sub 2] and NiAl-TiB[sub 2]-Y[sub 2]O[sub 3] are studied. The special cold sintering behavior of the NiAl-TiB[sub 2] powders during MA is reported.

• OSTI ID: 6888116
• Journal Information: Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 31:11; ISSN 0956-716X; ISSN SCRMEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360601* -- Other Materials-- Preparation & Manufacture
360602 -- Other Materials-- Structure & Phase Studies
ALLOYS
ALUMINIUM ALLOYS
BORIDES
BORON COMPOUNDS
CHALCOGENIDES
COMPOSITE MATERIALS
DATA
EXPERIMENTAL DATA
FABRICATION
GRAIN SIZE
INFORMATION
MACHINING
MATERIALS
MICROSTRUCTURE
MILLING
NICKEL ALLOYS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
SINTERING
SIZE
TITANIUM BORIDES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES