公开(公告)号：US20220234132A1

公开(公告)日：2022-07-28

申请号：US17585085

申请日：2022-01-26

Applicant: UNIVERSITY OF NORTH TEXAS

Inventor： Dwight A. BURFORD ,  Rajiv MISHRA

IPC: B23K20/12

Abstract: A method of forming an internal channel within a workpiece. In an embodiment, the method includes (a) rotating a tool about a central axis, wherein the tool includes: a shoulder; a pin extending axially from the shoulder; and a flange mounted to the pin that is spaced from the shoulder along the central axis. In addition, the method includes (b) moving the tool across the workpiece in a radial direction with respect to the central axis during (a). Further, the method includes (c) engaging the shoulder of the tool with an outer surface of the workpiece during (a) and (b), (d) submerging the pin and the flange within the workpiece during (a) and (b); and (e) forming the internal channel with the flange during (a) and (b).

公开(公告)号：US20230357899A1

公开(公告)日：2023-11-09

申请号：US18246351

申请日：2021-10-08

Applicant: UNIVERSITY OF NORTH TEXAS

Inventor： Rajiv MISHRA ,  Mageshwari KOMARASAMY ,  Saket THAPLIYAL

IPC: C22C21/00

CPC classification number: C22C21/00

Abstract: Non-equilibrium conditions and distinctive process-dynamics give laser-powder bed fusion (L-PBF) inherent capability to produce unique microstructural-features. However, alloy-design strategies that not only tackle printability-related challenges but also capitalize on such inherent capability, are imperative. Hence, an alloy-design strategy that integrates concepts of grain-refinement and eutectic-solidification is proposed. Consequently, an Al-3Ni-1Ti-0.8Zr (wt. %) alloy has been designed and processed with L-PBF. The alloy exhibits a wide processing-window, indicating excellent printability, and hierarchical features-enabled heterogeneous grain-structured microstructure; a high synergistic as-built strength-ductility is thus obtained. Notably, wide processing-window allows fine-tuning of as-built microstructure, whereas heterogeneous microstructure potentially allows activation of back-stress strengthening and work-hardening.

公开(公告)号：US20210008658A1

公开(公告)日：2021-01-14

申请号：US16926194

申请日：2020-07-10

Applicant: UNIVERSITY OF NORTH TEXAS

Inventor： Michael FRANK ,  Tianhao WANG ,  Rajiv MISHRA

IPC: B23K20/12

Abstract: A friction stir welding tool comprises a cylindrical shank, a shoulder portion disposed at a distal end of the shank, a pin extending from the shoulder, a cutting insert mounted within a concave portion at the distal end of the shank, and a scribe cutter mounted at a distal end of the cutting insert. The cutting insert extends distally through a channel in the pine, and the scribe cutter extends from a distal end surface of the pin in an offset position. The distal end surface of the pin is perpendicular to a longitudinal axis of the shank.