Microstructure characteristic and grain refining performance of Al-5Ti-1B master alloy improved by copper mould die casting

被引：2
作者：
Li, T. [1 ,2 ]
Wang, J. H. [1 ,3 ]
Su, X. P. [1 ,3 ]
Peng, H. P. [1 ,3 ]
Tu, H. [1 ,3 ]
Liu, Y. [1 ,3 ]
机构：
[1] Changzhou Univ, Key Lab Adv Metall Mat Changzhou City, Changzhou 213164, Peoples R China
[2] Nanshan Light Alloy Co, Longkou 265700, Peoples R China
[3] Changzhou Univ, Sch Mat Sci & Engn, Changzhou 213164, Peoples R China
来源：
MATERIALS SCIENCE AND TECHNOLOGY | 2013年 / 29卷 / 01期
基金：
中国国家自然科学基金;
关键词：
Microstructure; Grain refinement; Copper mould die casting; Al-Ti-B master alloy; AL-TI-B; ALUMINUM-ALLOYS; REFINEMENT; GROWTH; SIZE; EFFICIENCY; MECHANISM; TITANIUM;
D O I：
10.1179/1743284712Y.0000000119
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The influence of subrapid solidified processing parameters on the microstructure characteristic and grain refining efficiency of Al-5Ti-1B master alloy has been studied. The results show that the mean size of Al3Ti particles in Al-5Ti-1B master alloy decreases significantly after copper mould die casting. The morphology of Al3Ti particles changed from plate-like to blocky and petaloid. Compared with conventional Al-5Ti-1B master alloy, the phase constitution of subrapidly solidified Al-5Ti-1B master alloy does not change, and the improved master alloy shows a better grain refining efficiency. The microhardness of the pure aluminium refined by conventional and improved Al-5Tu-1B obeys the Hall-Petch relation, and the material constant k(H) is in the range of 84.02-91.80 MPa mu m(1/2). The mechanisms of grain refinement of aluminium by inoculation with improved Al-5Ti-1B master alloy are discussed based on the duplex nucleation theory and growth restriction effects in aluminium alloys.
引用
收藏
页码：93 / 99
页数：7
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