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Title: The Use of Friction Stir Technology to Modify Surfaces of AM60B Magnesium Die Castings

Abstract

These experiments were done to evaluate the feasibility of locally modifying the surface properties of magnesium alloys with friction-stir processing. The magnesium alloy used for the study was high-pressure die-cast AM60B, nominally Mg-6Al-0.13 Mn (wt.%). Friction-stir passes were made with a translation speed of 1.7 mm/s using tool-rotation speeds of 1,250 rpm or 2,500 rpm. Stir passes with good appearance were obtained under both conditions. In some cases up to five passes were overlapped on a single bar to produce stir zones with cross-sectional dimensions of about 1.5 mm x 10 mm. Metallographic examinations indicated that the stir zones were largely comprised of a magnesium solid solution with equiaxed grains on the order of 5-10 {micro}m in size. Hardness mapping showed that the stir zones experienced increases of 16-25% compared to the as-cast metal. Room-temperature testing showed that, compared to the cast metal, the stir zones had flow stresses nearly 20% higher with about twice the tensile elongation.

Authors:
 [1];  [2];  [1];  [3]
  1. ORNL
  2. South Dakota School of Mines and Technology
  3. Ford Motor Company
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1003504
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Metals; Journal Volume: 58; Journal Issue: 5
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CASTINGS; DIMENSIONS; ELONGATION; FRICTION; HARDNESS; MAGNESIUM; MAGNESIUM ALLOYS; PROCESSING; SOLID SOLUTIONS; STRESSES; SURFACE PROPERTIES; TESTING; VELOCITY

Citation Formats

Santella, Michael L, Degen, Cassandra, Frederick, David Alan, and Pan, Dr. Tsung-Yu. The Use of Friction Stir Technology to Modify Surfaces of AM60B Magnesium Die Castings. United States: N. p., 2006. Web. doi:10.1007/s11837-006-0025-9.
Santella, Michael L, Degen, Cassandra, Frederick, David Alan, & Pan, Dr. Tsung-Yu. The Use of Friction Stir Technology to Modify Surfaces of AM60B Magnesium Die Castings. United States. doi:10.1007/s11837-006-0025-9.
Santella, Michael L, Degen, Cassandra, Frederick, David Alan, and Pan, Dr. Tsung-Yu. Sun . "The Use of Friction Stir Technology to Modify Surfaces of AM60B Magnesium Die Castings". United States. doi:10.1007/s11837-006-0025-9.
@article{osti_1003504,
title = {The Use of Friction Stir Technology to Modify Surfaces of AM60B Magnesium Die Castings},
author = {Santella, Michael L and Degen, Cassandra and Frederick, David Alan and Pan, Dr. Tsung-Yu},
abstractNote = {These experiments were done to evaluate the feasibility of locally modifying the surface properties of magnesium alloys with friction-stir processing. The magnesium alloy used for the study was high-pressure die-cast AM60B, nominally Mg-6Al-0.13 Mn (wt.%). Friction-stir passes were made with a translation speed of 1.7 mm/s using tool-rotation speeds of 1,250 rpm or 2,500 rpm. Stir passes with good appearance were obtained under both conditions. In some cases up to five passes were overlapped on a single bar to produce stir zones with cross-sectional dimensions of about 1.5 mm x 10 mm. Metallographic examinations indicated that the stir zones were largely comprised of a magnesium solid solution with equiaxed grains on the order of 5-10 {micro}m in size. Hardness mapping showed that the stir zones experienced increases of 16-25% compared to the as-cast metal. Room-temperature testing showed that, compared to the cast metal, the stir zones had flow stresses nearly 20% higher with about twice the tensile elongation.},
doi = {10.1007/s11837-006-0025-9},
journal = {Journal of Metals},
number = 5,
volume = 58,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}