Microstructural evolution and mechanical property of Al–Zr and Al–Zr–Y alloys

Microstructural evolution and mechanical property of Al–Zr and Al–Zr–Y alloys
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Al-Zr和Al-Zr-Y合金的显微组织演变及力学性能

DOI:
10.1016/j.msea.2014.08.017
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发表时间:
2014-10
影响因子:
6.4
通讯作者:
王俊
王俊
中科院分区:
材料科学1区
文献类型:
--
作者:
王俊

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研究了Al-0.30Zr、Al-0.30Zr - 0.08 y和Al-0.30Zr - 0.16 y (wt%)合金的显微组织和力学性能。少量添加Y细化了铸态Al-Zr-Y合金的晶粒尺寸,在晶内和晶界处形成共晶Al3Y相颗粒。随着Y添加量的增加,Al-Zr-Y中Al3Y的含量和粒径增大。450℃等温时效过程中,固溶体的分解导致Al-Zr-Y枝晶区中大量密度较大的l12结构Al3(Zr,Y)相析出。Al-Zr - y合金晶粒内和晶界附近的无析出区比Al-Zr合金窄。随着y含量的增加,Al-Zr合金的力学性能得到改善。与Al-0.30Zr相比,Al-0.30Zr - 0.08 y合金的抗再结晶性能有所提高。然而,过量的y含量(0.16%)不利于Al-Zr合金的再结晶性能,因为微米尺寸的Al3Y相会诱发粒子模拟形核(PSN)。
Microstructure and mechanical property of Al–0.30Zr, Al–0.30Zr–0.08Y and Al–0.30Zr–0.16Y (wt%) alloys were investigated. Minor addition of Y refines the grain size and forms the eutectic Al3Y phase particles within grains and at grain boundaries in as-cast Al–Zr–Y alloys. The increase of Y additions results in larger amount and particle size of Al3Y in Al–Zr–Y. The decomposition of solid solution leads to a high number density of secondary L12-structured Al3(Zr,Y) precipitates within dendritic regions in Al–Zr–Y during isothermal aging at 450 °C. The precipitate-free regions in grains and adjacent to grain boundaries in Al–Zr–Y alloys are narrower than that in Al–Zr. The mechanical property of Al–Zr alloys gets improved with increasing Y-content. The Al–0.30Zr–0.08Y alloys show improved recrystallization resistance compared with Al–0.30Zr. However, excess Y-addition,e.g.0.16%, is detrimental to the recrystallization resistance of Al–Zr alloys due to the particle simulate nucleation (PSN) induced by micron-sized Al3Y phase.
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