Abstract Metal-matrix composites (MMC) of a 2000-series aluminum alloy coupled with AlN were fabricated through a commercially-relevant aluminum powder metallurgy (APM) approach. Cylindrical preforms containing 0–5 vol% AlN were produced to investigate the mechanical properties and microstructure evolution through hot upset forging. Specimen were deformed to a maximum strain of 0.15–1.55 mm/mm at rates of 0.1–1.0 s−1. TEM observations of forged products indicated the Al–AlN interfaces were free of defects and of high quality. Near-full (>99.5% theoretical) densities were observed at 1.40 mm/mm. At this strain, a substantial increase in all tensile properties was observed. An elastic modulus of 77 GPa was realized in a forged product with 5% AlN, accompanied by a 0.2% offset yield strength of 325 MPa and a UTS of at least 400 MPa. Versus an undeformed sample, forged MMC’s exhibited up to a five-fold increase in tensile ductility. Likewise, improvements of up to 98 MPa (57%) in fatigue strength were recorded. Mechanical gains were a result of densification and residual oxide disruption, as well as the enhanced dispersion of the AlN phase.

中文翻译：

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一种AlN增强的热镦锻2XXX系列铝粉冶金合金的显微组织和力学性能研究

摘要 通过商业相关的铝粉冶金 (APM) 方法制造了 2000 系列铝合金与 AlN 的金属基复合材料 (MMC)。生产含有 0-5 vol% AlN 的圆柱形预制件，以研究通过热镦锻的机械性能和微观结构演变。试样以 0.1-1.0 s-1 的速率变形至 0.15-1.55 mm/mm 的最大应变。锻造产品的 TEM 观察表明 Al-AlN 界面没有缺陷且质量高。在 1.40 mm/mm 处观察到接近全（> 99.5% 理论）密度。在该应变下，观察到所有拉伸性能均显着增加。在具有 5% AlN 的锻造产品中实现了 77 GPa 的弹性模量，同时具有 0.2% 的偏移屈服强度 325 MPa 和至少 400 MPa 的 UTS。与未变形的样品相比，锻造 MMC 的拉伸延展性增加了五倍。同样，记录到疲劳强度提高了 98 MPa (57%)。机械增益是致密化和残留氧化物破坏以及 AlN 相分散增强的结果。