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采用熔铸原位合成法制备Al-Ni/7050复合材料,结果显示,原位生成的Al-Ni相尺寸不一,以长径50μm以上为主,拉伸试验发现,Al-Ni硬脆相粗大是引起脆性断裂的主要原因。对7050-10Ni复合材料进行多道次热/冷轧制显示,Al-Ni相尺度与形态递进变化,采用矩形近似测量法测量和表征材料中大块板条第二相尺寸的变化规律,结果表明:轧制后,Al-Ni增强相破碎,由初始树枝状板条破碎为近等轴颗粒,其中冷轧后颗粒棱角破碎迹象明显,热轧后颗粒倾向于保持原有棱角,仅缩小颗粒尺寸,硬度测试表示,Al-Ni相尺寸与硬度有峰值对应关系,其中冷轧加工硬化趋势较明显。
Al-Ni / 7050 composites were prepared by in-situ melting synthesis. The results showed that the Al-Ni phases formed in situ were different in size and mainly had a major axis of 50μm. The tensile tests showed that Al-Ni hard and brittle phases were coarse Is the main reason causing brittle fracture. The multi-pass hot / cold rolling of 7050-10Ni composite shows that the Al-Ni phase scale and morphology change progressively. The rectangular approximation method is used to measure and characterize the variation of the second phase size of the large slab in the material. The results show that the Al-Ni reinforcing phase is crushed after rolling and is broken into nearly equiaxed particles by the initial dendritic slab. The cold-rolled particles show obvious angular crushing. The hot-rolled particles tend to keep the original edges and only reduce Particle size and hardness tests show that the Al-Ni phase has a peak-to-peak correlation with the hardness, of which cold-working hardening tendency is obvious.