Synthesis and spark plasma sintering of Al-Mg-Zr alloys
来源期刊：中南大学学报(英文版)2013年第1期
论文作者：N. Saheb A. S. Hakeem A. Khalil N. Al-Aqeeli T. Laoui
文章页码：7 - 14
Key words：aluminum alloys; mechanical alloying; spark plasma sintering; powder metallurgy
Abstract: Although casting is commonly used to process aluminum alloys, powder metallurgy remains a promising technique to develop aluminum based materials for structural and functional applications. the possibility to synthesize Al-Mg-Zr alloys through mechanical alloying and spark plasma sintering techniques was explored. Al-10Mg-5Zr and Al-5Mg-1Zr alloyed powders were synthesized through wet ball milling the appropriate amount of elemental powders. The dried milled powders were spark plasma sintered through passing constant pulsed electric current with fixed pulse duration at a pressure of 35 MPa. The samples were vacuum sintered at 450, 500, 550, 600 and 620 °C for 10, 15 and 20 min. The Al-10Mg-5Zr alloy displays poor densification at lower sintering temperatures of 450, 500, 550 and 600 °C. Its sinterability is improved at a temperature of 620 °C whereas sintering temperatures higher than 620 °C leads to partial melting of the alloy. It is possible to sinter the Al-5Mg-1Zr alloy at 450, 500 and 550 °C. The increase of sintering temperature improves its densification and increases its hardness. The Al-5Mg-1Zr alloy displays better densification and hardness compared to Al-10Mg-5Zr alloys.
N. Saheb, A. S. Hakeem, A. Khalil, N. Al-Aqeeli, T. Laoui
(Department of Mechanical Engineering/Center of Research Excellence in Nanotechnology,
King Fahd University of Petroleum & Minerals (KFUPM), Dhahran 31261, Kingdom of Saudi Arabia)
Abstract:Although casting is commonly used to process aluminum alloys, powder metallurgy remains a promising technique to develop aluminum based materials for structural and functional applications. the possibility to synthesize Al-Mg-Zr alloys through mechanical alloying and spark plasma sintering techniques was explored. Al-10Mg-5Zr and Al-5Mg-1Zr alloyed powders were synthesized through wet ball milling the appropriate amount of elemental powders. The dried milled powders were spark plasma sintered through passing constant pulsed electric current with fixed pulse duration at a pressure of 35 MPa. The samples were vacuum sintered at 450, 500, 550, 600 and 620 °C for 10, 15 and 20 min. The Al-10Mg-5Zr alloy displays poor densification at lower sintering temperatures of 450, 500, 550 and 600 °C. Its sinterability is improved at a temperature of 620 °C whereas sintering temperatures higher than 620 °C leads to partial melting of the alloy. It is possible to sinter the Al-5Mg-1Zr alloy at 450, 500 and 550 °C. The increase of sintering temperature improves its densification and increases its hardness. The Al-5Mg-1Zr alloy displays better densification and hardness compared to Al-10Mg-5Zr alloys.
Key words:aluminum alloys; mechanical alloying; spark plasma sintering; powder metallurgy
