Ultrasonic measurement of texture coefficient W[sub 400] in aluminum alloys

Man, Chi-Sing; Morris, James G.; Rehbein, David K.; Thompson, R. Bruce; Liu, Yansheng; Fan, Xingyan
May 2000
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p1645
Academic Journal
A recent study on the textures in strip-cast AA3105 aluminum alloy suggests that ultrasonic measurement of the texture coefficient W[sub 400] would provide a promising means for on-line monitoring of textures in this alloy. Ultrasonic measurement of W[sub 400] in aluminum alloys, however, has long been an outstanding research problem in nondestructive evaluation. In this paper we report our preliminary findings on the feasibility of using the velocity ratio k≡V[sub 33] [FRACTION SHAPE="CASE"][NUM]1[/NUM][DEN]2[/DEN][/FRACTION] (V[sub 31]+V[sub 32]) for measurement of W[sub 400] in strip-cast AA3105 alloy; here V[sub 33] denotes the speed of longitudinal wave propagating in the normal direction of a sample sheet; V[sub 31] and V[sub 32] are speeds of through-thickness shear waves with polarization in the rolling and transverse direction, respectively. Samples of a commercial strip-cast. AA3105 hot band were annealed and cold rolled under various conditions to simulate a broad range of texture conditions. The velocity ratio k and the texture coefficient W[sub 400] of these samples were measured by ultrasonics and by X-ray diffraction, respectively. Our preliminary results indicate that the data points for the k versus W[sub 400] plot fall along two parallel straight lines. Roughly speaking, the data points pertaining to samples which were sufficiently annealed fall on one line and those corresponding to samples which were sufficiently cold rolled fall on another. Possible implications of this finding on the broader problem of ultrasonic measurement of W[sub 400] in aluminum alloys are discussed. © 2000 American Institute of Physics.


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