AI matrix composite containing high volume fraction silicon has been promising candidate for lightweight and low-thermal-expansion components. Whereas, optimization of its mechanical properties still is an open challe...AI matrix composite containing high volume fraction silicon has been promising candidate for lightweight and low-thermal-expansion components. Whereas, optimization of its mechanical properties still is an open challenge. In this article, a flexile powder metallurgy processing was used to produce a fully dense AI-4.0Cu （wt%） alloy composite reinforced with 65 vol.% Si particles. In this composite, Si particles were homogenously distributed, and the particle size was refined to the range of 3-15 μm. Tensile and flexural strength of the composite were 282 and 455 MPa, respectively, about 100% and 50% higher than the best properties reported in literature. The measured fracture toughness of the composite was 4.90 MPa m1/2. The improved strength of 65%Si/AI was attributed to the optimized particle characteristics and matrix properties. This investigation is expected to provide a primary understanding of the mechanical behaviors of Si/AI composites, and also promote the structural applications of this low-thermal-expansion material.展开更多
Purpose:To evaluate outcome and toxicity after carbon ion radiotherapy(RT)in skin carcinomas.Patients and Methods:Between November 2006 to September 2008,thirty-three patients with squamous cell carcinoma of the skin(...Purpose:To evaluate outcome and toxicity after carbon ion radiotherapy(RT)in skin carcinomas.Patients and Methods:Between November 2006 to September 2008,thirty-three patients with squamous cell carcinoma of the skin(n=12),basal cell carcinoma of the skin(n=7),malignant skin melanoma(n=6),Bowen’s disease(n=6)and Paget’s disease(n=2)were treated with carbon ion RT at Heavy Ion Research Facility in Lanzhou(HIRFL)within a Phase I trial.Two and three-dimensional conformal irradiation methods realized by the passive beam delivery system and the average RBE of 2.5-3 within the target volume were used in the trial.In 33 patients,there were 9 with failures or recurrences of conventional RT and 14 with recurrences of surgeries.展开更多
基金supported by the National Basic Research Program of China(973 Program)(No.2012CB619606)
文摘AI matrix composite containing high volume fraction silicon has been promising candidate for lightweight and low-thermal-expansion components. Whereas, optimization of its mechanical properties still is an open challenge. In this article, a flexile powder metallurgy processing was used to produce a fully dense AI-4.0Cu （wt%） alloy composite reinforced with 65 vol.% Si particles. In this composite, Si particles were homogenously distributed, and the particle size was refined to the range of 3-15 μm. Tensile and flexural strength of the composite were 282 and 455 MPa, respectively, about 100% and 50% higher than the best properties reported in literature. The measured fracture toughness of the composite was 4.90 MPa m1/2. The improved strength of 65%Si/AI was attributed to the optimized particle characteristics and matrix properties. This investigation is expected to provide a primary understanding of the mechanical behaviors of Si/AI composites, and also promote the structural applications of this low-thermal-expansion material.
文摘Purpose:To evaluate outcome and toxicity after carbon ion radiotherapy(RT)in skin carcinomas.Patients and Methods:Between November 2006 to September 2008,thirty-three patients with squamous cell carcinoma of the skin(n=12),basal cell carcinoma of the skin(n=7),malignant skin melanoma(n=6),Bowen’s disease(n=6)and Paget’s disease(n=2)were treated with carbon ion RT at Heavy Ion Research Facility in Lanzhou(HIRFL)within a Phase I trial.Two and three-dimensional conformal irradiation methods realized by the passive beam delivery system and the average RBE of 2.5-3 within the target volume were used in the trial.In 33 patients,there were 9 with failures or recurrences of conventional RT and 14 with recurrences of surgeries.
