Stress-strain behavior of fine-grained Al/Al[sub 3]Ti alloys
- National Sun Yat-Sen Univ., Kaohsiung (Taiwan, Province of China)
It has been recognized that dispersion strengthening with hard, stable, high melting point phases offers an effective technique for improving the stiffness of aluminum alloys over a wider temperature range compared to precipitation strengthening. Recent research indicates that mechanically alloyed (MA) Al-Ti alloys have good ambient and elevated temperature properties. The MA Al-Ti alloys are characterized by the presence of large volume fractions of submicron sized Al[sub 3]Ti dispersoids within a fine grain aluminum matrix. In addition, such alloys contain a significant amount of ultrafine Al[sub 4]C[sub 3] and Al[sub 2]O[sub 3] dispersoids incorporated during the MA process. The carbide and oxide dispersoids reside mainly along grain boundaries and can stabilize a fine-grain structure even after long term exposure at elevated temperature. The high temperature strength of these MA aluminum alloys is strongly controlled by carbide and oxide dispersoids. The Young's modulus of Al[sub 3]Ti phase was determined to be about 220 GPa. Hence, the presence of the Al[sub 3]Ti phase is very effective in increasing the stiffness of the MA aluminum alloys is strongly controlled by carbide and oxide dispersoids. The Young's modulus of Al[sub 3]Ti phase was determined to be about 220 GPa. Hence, the presence of the Al[sub 3]Ti phase is very effective in increasing the stiffness of the MA aluminum alloys. The strength of such alloys increases with increasing Al[sub 3]Ti content; however, the strengthening effect of Al[sub 3]Ti dispersoids diminishes at temperatures above about 400C. On the other hand, such dispersoids also appear responsible for improving the high temperature ductility of the MA Al-Ti alloys. A better understanding of the strengthening mechanisms is desirable. This paper presents the room temperature stress-strain behavior of two Al-Al[sub 3]Ti alloys made by mechanical alloying and hot-pressing.
- OSTI ID:
- 6137079
- Journal Information:
- Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 29:3; ISSN 0956-716X; ISSN SCRMEX
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
DATA
DISPERSION HARDENING
DISPERSIONS
DUCTILITY
EXPERIMENTAL DATA
FABRICATION
GRAIN BOUNDARIES
HARDENING
HOT PRESSING
INFORMATION
INTERMETALLIC COMPOUNDS
MATERIALS WORKING
MECHANICAL PROPERTIES
MICROSTRUCTURE
NUMERICAL DATA
PRECIPITATION HARDENING
PRESSING
STRAINS
STRESSES
TENSILE PROPERTIES
TITANIUM ALLOYS
YOUNG MODULUS