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Title: Characterization and formability of continuous-cast AZ31B magnesium alloy sheets

Abstract

The goal of this work is to understand the inter-relationship between the initial properties of continuous-cast magnesium alloy (AZ31B) sheets and their subsequent formability and post-formed mechanical performance for use in cost-effective, lightweight, automotive body panels. As-received sheets, provided by the Automotive Metals Division (AMD-602) team, were characterized by surface roughness measurements using mechanical profilometry. The arithmetic mean deviation of profile (Ra) and the maximum two-point height of profile (Ry) of the as-received sheets ranged from ~0.2-2 μm and ~2-15 μm, respectively. Several commercial lubricants were evaluated by thermal analysis and the liquid phase of the lubricants was found to evaporate/decompose upon heating leaving behind a solid residue upon heating to temperatures exceeding ~125-150°C. Elevated temperature bending-under-tension (BUT) friction tests were conducted at 350°C and the coefficient-of-friction values ranged from a minimum of ~0.1 (for tungsten disulfide lubricant) to ~0.7 when no lubricant was used. These results, in conjunction with those from the forming trials conducted by the AMD-602 team, will be eventually used to determine the role of sheet-die friction in determining the formability of AZ31B sheets.

Authors:
; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
989050
Report Number(s):
PNNL-SA-68612
VT0505000; TRN: US201019%%255
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Conference
Resource Relation:
Conference: Magnesium Technology 2010, 573-578
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; DISULFIDES; FRICTION; HEATING; LUBRICANTS; MAGNESIUM; MAGNESIUM ALLOYS; PERFORMANCE; RESIDUES; ROUGHNESS; THERMAL ANALYSIS; TUNGSTEN; magnesium; formability; roughness; coefficient of friction

Citation Formats

Rohatgi, Aashish, Herling, Darrell R, and Nyberg, Eric A. Characterization and formability of continuous-cast AZ31B magnesium alloy sheets. United States: N. p., 2009. Web.
Rohatgi, Aashish, Herling, Darrell R, & Nyberg, Eric A. Characterization and formability of continuous-cast AZ31B magnesium alloy sheets. United States.
Rohatgi, Aashish, Herling, Darrell R, and Nyberg, Eric A. Thu . "Characterization and formability of continuous-cast AZ31B magnesium alloy sheets". United States.
@article{osti_989050,
title = {Characterization and formability of continuous-cast AZ31B magnesium alloy sheets},
author = {Rohatgi, Aashish and Herling, Darrell R and Nyberg, Eric A},
abstractNote = {The goal of this work is to understand the inter-relationship between the initial properties of continuous-cast magnesium alloy (AZ31B) sheets and their subsequent formability and post-formed mechanical performance for use in cost-effective, lightweight, automotive body panels. As-received sheets, provided by the Automotive Metals Division (AMD-602) team, were characterized by surface roughness measurements using mechanical profilometry. The arithmetic mean deviation of profile (Ra) and the maximum two-point height of profile (Ry) of the as-received sheets ranged from ~0.2-2 μm and ~2-15 μm, respectively. Several commercial lubricants were evaluated by thermal analysis and the liquid phase of the lubricants was found to evaporate/decompose upon heating leaving behind a solid residue upon heating to temperatures exceeding ~125-150°C. Elevated temperature bending-under-tension (BUT) friction tests were conducted at 350°C and the coefficient-of-friction values ranged from a minimum of ~0.1 (for tungsten disulfide lubricant) to ~0.7 when no lubricant was used. These results, in conjunction with those from the forming trials conducted by the AMD-602 team, will be eventually used to determine the role of sheet-die friction in determining the formability of AZ31B sheets.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2009},
month = {9}
}

Conference:
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