A comparison of continuous SPD processes for improving the mechanical properties of aluminum alloy 6111

Abstract

The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Department of Defense, Washington Headquarters Services, Directorate for Information PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) 8. PERFORMING ORGANIZATION REPORT NUMBERMonash University ABSTRACTMicrostructure evolution, mechanical properties, formability, and texture development were determined for AA6111 samples processed by asymmetric rolling (ASR) with different roll friction, velocity, or diameters, conventional rolling (CR), and equal-channel-angular pressing (ECAP). highly elongated or sheared grain structures were developed during ASR/CR and ECAP, respectively. ASR led to improved r-values and formability compared to CR primarily as a result of the development of moderate shear-texture components analogous to those developed during ECAP of billet material. ASR based on different roll diameters gave the best combination of strength, ductility, and formability. SUBJECT TERMSsevere plastic deformation, asymmetric rolling, equal channel angular pressing, aluminum alloy 6111 AbstractMicrostructure evolution, mechanical properties, formability, and texture development were determined for AA6111 samples processed by asymmetric rolling (ASR) with different roll friction, velocity, or diameters, conventional rolling (CR), and equal-channel-angular pressing (ECAP). Highly elongated or sheared grain structures were developed during ASR/CR and ECAP, respectively. ASR led to improved r-values and formability compared to CR primarily as a result of the development of moderate shear-texture components analogous to those developed during ECAP of billet material. ASR based on different roll diameters gave the best combination of strength, ductility, and formability.

Annealing behavior of severely deformed IF steel via the differential speed rolling method

“…With increasing number of operations up to 4-pass which was equal to the effective strain of E1.7, the microstructure of the DSR-deformed IF steel was comprised of severely elongated grains and fine grains as displayed in Fig. 2(b), which was consistent with the previous reports [11,12]. In addition, the microstructure of the severely deformed IF steel supported the fact that the DSR strain was penetrated and distributed uniformly throughout microstructure in that most ferrite grains were aligned parallel to the deformation direction.…”

Asymmetric Rolling of Interstitial-Free Steel Using One Idle Roll

“…[7][8][9][10][11][12] ASR is relatively easy to implement and the preceding shortcomings of continuous ECAP processing are not applicable to this technology. The simplest method to introduce asymmetry in the rolling process is to disengage one of the rolls from the motor and to roll the sheet using one driven and one idle roll.…”

ECAP with back pressure for optimum strength and ductility in aluminium alloy 6016. Part 2: Mechanical properties and texture

“…However, the effect of back pressure on texture development has not yet been documented. Texture plays an important role in the formability of aluminium alloys [13][14][15].…”