Impression creep behavior of magnesium alloy ZK60

Huimin Liao; Ming Zeng; Hong Chen

doi:10.3139/120.111119

Article

Impression creep behavior of magnesium alloy ZK60

Huimin Liao , Ming Zeng and Hong Chen

Published/Copyright: December 28, 2017

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From the journal Materials Testing Volume 60 Issue 1

Abstract

Creep behavior of the ZK60 magnesium alloy was investigated using impression creep technique. The tests were carried out under constant punching stress at high temperatures (175, 200 and 225 °C) under low stresses (25, 50, 75 and 100 MPa) and at low temperatures (100, 125 and 150 °C) under high stresses (100, 125, 150 and 175 MPa). The creep mechanism of the extruded ZK60 magnesium alloy is grain boundary sliding by dislocation climbing obtained at low temperature and high pressure. At high temperature and under low pressure, the creep mechanism of the extruded ZK60 magnesium alloy is grain boundary diffusion by grain boundary sliding. The initial microstructure of the extruded ZK60 magnesium alloy was composed of mainly Mg phase and a little MgZn phase. Under the conditions of low temperature and high pressure, MgZn₂ phase precipitated during creep deformation. Under the conditions of high temperature and low pressure, MgZn₂ phase and a small amount of Zr-Zn phase precipitated during creep deformation. The creep resistance of magnesium alloy ZK60 under the conditions of low temperature and high pressure is better than under the conditions of high temperature and low pressure.

Kurzfassung

Das Kriechverhalten der Magnesiumlegierung ZK60 wurde unter Druckbeanspruchung untersucht. Die Versuche wurden unter konstanter Stanzspannung bei hohen Temperaturen (175, 200 und 225 °C) unter niedrigen Spannungen (25, 50, 75 und 100 MPa) sowie bei niedrigen Temperaturen (100, 125 und 150 °C) unter hohen Spannungen (100, 125, 150 und 175 MPa) durchgeführt. Der Kriechmechanismus der stranggepressten Magnesiumlegierung ZK60 besteht im Korngrenzengleiten infolge Versetzungskletterns bei niedriger Temperatur und hohem Druck. Der Kriechmechanismus der stranggepressten Magnesiumlegierung ZK60 besteht in der Korngrenzendiffusion infolge Versetzungsgleitens bei hoher Temperatur und niedrigem Druck. Die ursprüngliche Mikrostruktur der stranggepressten Magnesiumlegierung ZK60 besteht hauptsächlich aus der Mg-Phase und zu einem geringen Anteil aus der MgZn-Phase. Unter den Bedingungen niedriger Temperatur und hohem Druck schied sich MgZn₂ während der Kriechdeformation aus. Dagegen wurde unter den Bedingungen hoher Temperatur und niedrigem Druck MgZn₂ und eine kleine Menge der Phase Zr-Zn während der Kriechdeformation ausgeschieden. Die Kriechfestigkeit der Magnesiumlegierung ZK60 ist bei niedriger Temperatur und hohem Druck besser, als bei hoher Temperatur und niedrigem Druck.

*Correspondence Address, Assoc. Prof. Dr. Huimin Liao, Key Laboratory of Fluid and Power, Machinery of Ministry of Education, School of Materials Science and Engineering, Xihua University, Chengdu, Sichuan Province, 610039, P.R. China, E-mail: liaohuimin0619@163.com

Dr. Huimin Liao is Associate Professor of Materials Science and Engineering at the School of Materials Science and Engineering, Xihua University, Chengdu, China, with expertise in metallic materials. She received her PhD degree from Chongqing University, Chongqing, China, in 2009. She joined Xihua University in 2010.

Dr. Ming Zeng is Professor of Materials Science and Engineering at the School of Materials Science and Engineering, Xihua University, Chengdu, China, with expertise in in wear resistant materials. She received his PhD degree from Sichuan University, Chengdu, China, in 2012. She joined Xihua University in 1991.

Hong Chen studied in the School of Materials Science and Engineering, Xihua University, Chengdu, China, and received her master's degree in Materials Science and Engineering from Xihua University in 2016.

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Published Online: 2017-12-28

Published in Print: 2018-01-04

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https://doi.org/10.3139/120.111119