Accession Number : ADA255685


Title :   The Titanium-Aluminum Phase Diagram. A Review of the Near Ti-50 At.% Al Phase Fields


Descriptive Note : Final rept.


Corporate Author : ARMY LAB COMMAND WATERTOWN MA MATERIAL TECHNOLOGY LAB


Personal Author(s) : Chin, Ernest S ; Biederman, Ronald R


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a255685.pdf


Report Date : Jul 1992


Pagination or Media Count : 26


Abstract : The understanding of the titanium-aluminum (Ti-Al) phase diagram is of great importance to the development of titanium-aluminide alloys and composites for high temperature applications. In this report, the Ti-Al phase diagram near 50 atomic percent (at.%) aluminum is critically reviewed. Murray's Ti-Al phase diagram has been well accepted by the materials community in the late 1980s. Recent results from solidification experiments point toward the existence of a high temperature alpha phase field consistent with two high temperature peritectic reactions (beta + L - alpha + L -* gamma) near 50 at.% aluminum. These reactions are not accounted for in Murray's Ti-Al phase diagram. Close evaluation of the past experimental techniques by which data were utilized in Murray's calculation of the Ti-Al phase diagram revealed areas of uncertainties. These uncertainties are primarily due to the limitation of analytical capabilities available at the time the experiments were performed.


Descriptors :   *ALLOYS , *ALUMINUM , *TITANIUM , *TITANIUM ALUMINIDE , *PHASE DIAGRAMS , TEMPERATURE , UNCERTAINTY , COMMUNITIES , ALUMINIDES , DIAGRAMS , PHASE , LIMITATIONS , TIME , MATERIALS , HIGH TEMPERATURE , SOLIDIFICATION


Subject Categories : Inorganic Chemistry
      Physical Chemistry
      Properties of Metals and Alloys


Distribution Statement : APPROVED FOR PUBLIC RELEASE