采用 XD法与搅拌铸造法相结合的工艺制备了 Ti C/ZA43复合材料 (0 <Vf<5.5% )。研究了 Ti C颗粒增强相对铸造 Ti C/ZA43复合材料组织及力学性能的影响 ,并对这些现象进行了理论分析。结果表明 ,Ti C颗粒使 Ti C/ZA43复合材料的微...采用 XD法与搅拌铸造法相结合的工艺制备了 Ti C/ZA43复合材料 (0 <Vf<5.5% )。研究了 Ti C颗粒增强相对铸造 Ti C/ZA43复合材料组织及力学性能的影响 ,并对这些现象进行了理论分析。结果表明 ,Ti C颗粒使 Ti C/ZA43复合材料的微观组织显著改善 ,Ti C在凝固过程中起到异质形核中心的作用。随着 Ti C颗粒的增加 ,Ti C/ZA43复合材料的室温抗拉强度、屈服强度、硬度均有显著提高 ,塑性有一些降低。Ti C/ZA43复合材料的高温力学性能明显优于基体合金。这主要是由于 Ti C颗粒的加入改变了 Ti C颗粒和 ZA43合金基体的载荷分配以及 Ti C颗粒加入引起的位错强化与细晶强化作用。展开更多
The effects of Y addition on microstructures and properties of as-cast and solid solutioning and aging treated Mg-0.8Zr-0.35Zn alloys at elevated temperature (250 ℃) were investigated by the use of XJG-04 optical mic...The effects of Y addition on microstructures and properties of as-cast and solid solutioning and aging treated Mg-0.8Zr-0.35Zn alloys at elevated temperature (250 ℃) were investigated by the use of XJG-04 optical microscopy, JCXA-733 electron probe, D/max-rB X-ray diffractometer (XRD) and WDW-200 electronic universal material testing machine. The results show that the microstructures of as-cast and heat treated Mg-0.8Zr-0.35Zn alloys with Y addition are refined and a new phase, Mg_(24)Y_5, is formed. At 250 ℃, the strength at elevated temperature of the alloys increases with increasing amount of Y addition, but relative elongation and area reduction decreases. The tendency of brittle fracture of fractured surface at elevated temperature is enlarged and fracture is changed from ductile into cleavage.展开更多
文摘采用 XD法与搅拌铸造法相结合的工艺制备了 Ti C/ZA43复合材料 (0 <Vf<5.5% )。研究了 Ti C颗粒增强相对铸造 Ti C/ZA43复合材料组织及力学性能的影响 ,并对这些现象进行了理论分析。结果表明 ,Ti C颗粒使 Ti C/ZA43复合材料的微观组织显著改善 ,Ti C在凝固过程中起到异质形核中心的作用。随着 Ti C颗粒的增加 ,Ti C/ZA43复合材料的室温抗拉强度、屈服强度、硬度均有显著提高 ,塑性有一些降低。Ti C/ZA43复合材料的高温力学性能明显优于基体合金。这主要是由于 Ti C颗粒的加入改变了 Ti C颗粒和 ZA43合金基体的载荷分配以及 Ti C颗粒加入引起的位错强化与细晶强化作用。
文摘The effects of Y addition on microstructures and properties of as-cast and solid solutioning and aging treated Mg-0.8Zr-0.35Zn alloys at elevated temperature (250 ℃) were investigated by the use of XJG-04 optical microscopy, JCXA-733 electron probe, D/max-rB X-ray diffractometer (XRD) and WDW-200 electronic universal material testing machine. The results show that the microstructures of as-cast and heat treated Mg-0.8Zr-0.35Zn alloys with Y addition are refined and a new phase, Mg_(24)Y_5, is formed. At 250 ℃, the strength at elevated temperature of the alloys increases with increasing amount of Y addition, but relative elongation and area reduction decreases. The tendency of brittle fracture of fractured surface at elevated temperature is enlarged and fracture is changed from ductile into cleavage.
