研究生产高强度硼铝板的可能性,而不需要均质和淬火操作

K. Y. Chervyakova, N. Belov, M. Samoshina, A. Yakovlev
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摘要

Al-Cu-Mn (Zr)合金具有高强度和加工性,无需任何热处理操作。制备了al - 2% cu - 1,5% mn - 2% b和al - 2% cu - 1,5% mn - 0,4% zr - 2% b两种合金,探讨了不经热处理以高强度板料形式生产含铝硼合金的可能性。在RELTEK感应炉中进行熔炼,并进行强烈的熔体搅拌,以消除硼化物耐火颗粒的沉积。熔化温度为950 - 1000°С。熔体倒入40×120×200毫米石墨铸造模具中。用计算方法(热钙法)证明了锰在熔融温度下与铝和锆形成复合硼化物,而液体中有足够的锰,几乎没有锆留下。实验方法(电子扫描显微镜和电子探针分析)证明了复合al2mn2硼化物的形成,然而,锰在固溶体中保留足以形成Al20Cu2Mn3相颗粒,其量高达7wt .%。在含锆合金中,硼刺激初生Al3Zr晶体分离,因此,铝固溶体中留下的锆含量不足以进行硬化。结果表明,可以制备出厚度小于0.3 mm且晶粒尺寸小于10 μm的硼化物相团簇均匀分布的薄轧钢。由于在热变形(t =450°C)过程中析出Al20Cu2Mn3相分散体,在不使用硬化和时效的情况下,达到了高达543 MPa的高强度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
INVESTIGATION OF POSSIBILITY TO PRODUCE HIGH-STRENGTH BORON ALUMINUM SHEETS WITHOUT HOMOGENIZATION AND QUENCHING OPERATIONS
Al–Cu–Mn (Zr) alloys feature high strength and processability without any thermal treatment operations. Al–2%Cu–1,5%Mn–2%B and Al–2%Cu–1,5%Mn–0,4%Zr–2%B alloys were obtained in order to investigate the possibility of producing a aluminum boroncontaining alloy in the form of high-strength sheet rolled stock without thermal treatment. Melting was performed in the RELTEK induction furnace with intense melt stirring to eliminate sedimentation of boride refractory particles. Melting temperature was 950– 1000 °С. Melt was poured into 40×120×200 mm graphite casting molds. Calculation methods (Thermo-Calc) were used to demonstrate that manganese forms complex borides with aluminum and zirconium at a melting temperature while there is enough manganese in liquid and there is practically no zirconium left. Experimental methods (electronic scanning microscopy and electron microprobe analysis) proved the formation of the complex AlB2Mn2 boride, however, manganese remained in a solid solution is enough to form the Al20Cu2Mn3 phase particles in the amount up to 7 wt.%. In the alloy with zirconium, boron stimulates primary Al3Zr crystal separation and, therefore, zirconium content left in the aluminum solid solution is not sufficient for hardening. It is shown that it is possible to produce thin-rolled steel with a thickness of less than 0,3 mm with uniformly distributed clusters of the boride phase with a particle size of less than 10 μm. A high level of strength up to 543 MPa is reached without the use of hardening and aging due to the precipitation of Al20Cu2Mn3 phase dispersions during hot deformation (t =450 °C).
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