时效时间对变形铝硅合金组织与性能的影响
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摘要
研究不同固溶态Al-12.7Si-0.7Mg变形合金在180℃进行不同时间的人工时效处理,分析了时效时间对合金组织和力学性能的影响.结果表明:不同固溶态合金的时效强化的曲线表现出不同的单、双峰时效强化特征.变形铝硅合金经520℃固溶30 min随后180℃时效强化曲线存在明显的时效强化"双峰",并且第二个时效强化峰高于第一个时效强化峰.时效强化的单、双峰现象与合金的时效析出相的类型、尺寸以及析出序列密切相关.合金亚稳相的转变有明显的时间间隔,使合金时效强化曲线出现了"双峰"现象.
The effects of aging time on microstructure and properties of as-solutioned wrought Al-12.7Si-0.7Mg alloy artificial aged at 180 ℃ for different time were investigated. The results showed that the age hardening curves of different as-solutioned state alloys present single or twin peaks aging strengthening characteristics. Age hardening curve of wrought Al-Si alloy aged at 180 ℃ after solutioning at 520 ℃ for 30 min exhibits obvious age hardening "twin peaks",and the second age hardening peak is higher than the first one. The single and twin peaks age hardening phenomenon of alloy is closely related to the type,size,and the precipitation sequence of precipitates. The obvious interval during meta-stable phase transformation of alloy is the main reason for twin peaks aging hardening.
The effects of aging time on microstructure and properties of as-solutioned wrought Al-12.7Si-0.7Mg alloy artificial aged at 180 ℃ for different time were investigated. The results showed that the age hardening curves of different as-solutioned state alloys present single or twin peaks aging strengthening characteristics. Age hardening curve of wrought Al-Si alloy aged at 180 ℃ after solutioning at 520 ℃ for 30 min exhibits obvious age hardening "twin peaks",and the second age hardening peak is higher than the first one. The single and twin peaks age hardening phenomenon of alloy is closely related to the type,size,and the precipitation sequence of precipitates. The obvious interval during meta-stable phase transformation of alloy is the main reason for twin peaks aging hardening.
引文
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[6]Yu F X,Pei J H,He K Z,et al.Solidification microstructure and temperature field during direct chill casting of Al-16Si alloy[J].Transactions of the Indian Institute of Metals,2009,62(4/5):347-351.
[7]Liu F,Yu F X,Zhao D Z,et al.Microstructure and mechanical properties of an Al-12.7Si-0.7M g alloy processed by extrusion and heat treatment[J].Materials Science&Engineering A,2011,528(10):3786-3790.
[8]Miao W F,Laughlin D E.Precipitation hardening in aluminum alloy 6022[J].Scripta Materialia,1999,40(7):873-878.
[9]李润霞,李荣德,杨秀英,等.高强度铸造Al-Si-Cu-Mg合金时效特性的研究[J].铸造,2003,52(6):390-394.(Li Run-xia,Li Rong-de,Yang Xiu-ying,et al.Age hardening characteristics of high strength cast Al-Si-Cu-M g Alloy[J].Foundry,2003,52(6):390-394.)
[10]Li R X,Li R D,Zhao Y H,et al.Age-hardening behavior of cast Al-Si base alloy[J].Materials Letters,2004,58(15):2096-2101.
[11]Pogatscher S,Antrekowitsch H,Leitner H,et al.Influence of the thermal route on the peak-aged microstructures in an AlM g-Si aluminum alloy[J].Scripta Materialia,2013,68(2):158-161.
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[13]Chen J H,Costan E,van Huis M A,et al.Atomic pillar-based nanoprecipitates strengthen Al M g Si alloys[J].Science,2006,312(5772):416-419.
[14]Marioara C D,Andersen S J,Jansen J,et al.Atomic model for GP-zones in a 6082 Al-M g-Si system[J].Acta Materialia,2001,49(2):321-328.
[15]李润霞,李荣德,何立子,等.可热处理铸造Al-Si系合金时效行为研究[J].稀有金属材料与工程,2004,33(2):171-175.(Li Run-xia,Li Rong-de,He Li-zi,et al.Age-hardening behavior of heat-treatable Al-Si-base cast alloy[J].Rare Metal Materials and Engineering,2004,33(2):171-175.)
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