Research Toward Developing an Understanding of Crystallographic Texture on Mechanical Properties of Titanium Alloys,
Quarterly rept. 1 Mar-30 May 75,
DEL WEST ASSOCIATES INC WOODLAND HILLS CA
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The objectives of this program are to develop an understanding of the effect of crystallographic texture on the mechanical properties of titanium alloys. Three alloy compositions selected are 6Al-4V Ti, ELI Grade, 6Al-4V Ti, Standard Grade and 6Al-2Sn-4Zr-6Mo Ti. All three alloy compositions will be rolled so as to produce the maximum attainable concentration of 0002 poles in the width direction of the plate a basal transverse texture. Furthermore, they will be subjected to additional thermal processing to enhance the as rolled texture increase the 0002 pole density in the width direction of the plate. They will be tested for stiffness, strength, toughness, creep, fatigue resistance and stress corrosion susceptibility as a function of direction in the product. At this juncture, metallographic studies will be employed to ascertain the deformation response of the fine structure to preferred orientation and, the manner in which these combine to generate the stress corrosion susceptibility and fatigue resistance of various directions in the product. Several alternative heat treatment and rolling schedules will be examined to determine optimal procedures in both major alloy systems for eliminating andor minimizing the adverse effects of texturing without significantly lessening its known advantages. A full mechanical property evaluation program will be carried out using the optimal processing schedules to fully characterize the textured alloys. Metallographic techniques will be used throughout to assist in understanding the relation between microstructure texture and mechanical behavior.
- Properties of Metals and Alloys