采用往复挤压(RE)工艺,在350℃挤压比为7.7:1时,对工业纯铝L2进行了1道次和6道次往复挤压.结果发现,往复挤压可以改善材料的微观组织结构,显著细化晶粒,提高了组织的均匀性.然而往复挤压不能显著提高纯铝的硬度和拉伸强度.这是由于往复挤压过程中发生动态回复,极大地降低纯铝的位错密度,使材料软化,抵消了细晶强化作用.同时由于晶粒的细化和位错密度的降低,往复挤压提高了纯铝的延伸率.与室温等径转角挤压(ECAP)相比,350℃RE工艺可以提高工业纯铝L2的延展性,但对纯铝的细化效果不如ECAP.
参考文献
| [1] | Terhune S D;swisher D L;Oh-ishi K et al.An investigation of microstructure and grain-boundary evolution during ECA pressing of pure aluminum[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,2002,33A:2173-2183. |
| [2] | Dong H S;Kim I;Kim J et al.Grain refinement mechanism during equal-channel angular pressing of low-carbon steel[J].Acta Materialia,2001,49:1285-1292. |
| [3] | Chu H.S.;Liu K.S. .Study of 6061 -Al_2O_(3p) Composites Produced by Reciprocating Extrusion[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,2000(10):2587-2596. |
| [4] | Chu H S;Liu K S;Yeh J W .An in situ composite of Al (graphite,Al4 C3) produced by reciprocating extrusion[J].Materials Science and Engineering A,2000,277:25-32. |
| [5] | Lee S W;Wang H Y;Chen Y L et al.An Mg-Al-Zn alloy with very high specific strength and superior high-strain-rate superplasticity processed by reciprocating extrusion[J].Advances in Engineering Materials,2004,6(12):948-952. |
| [6] | Yuan S Y;Peng C H;Yeh J W .Synthesis of fine Pb-50vol.% Sn alloys by a new process of reciprocating extrusion[J].Materials Science and Technology,1999,15:683. |
| [7] | S.-W. Lee;J.-W. Yeh;Y.-S. Liao .Premium 7075 Aluminium Alloys Produced by Reciprocating Extrusion[J].Advanced Engineering Materials,2004(12):936-943. |
| [8] | 田景来 .ECAP纯铝L2的组织与性能研究[D].西安理工大学,2005. |
| [9] | 石德珂.位错与材料强度[M].西安:西安交通大学出版社,1988:145-147. |
| [10] | 李永霞,张永刚,陈昌麒.等截面通道角形挤压对高纯铝微观组织及力学性能的影响[J].航空材料学报,2001(03):33-38. |
| [11] | 孙佩玲 .纯铝等径转角挤压之变形组织[D].台湾国立中山大学材料科学研究所,2002. |
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