| 稀土Yb对AZ91镁合金铸态及时效态组织和性能的影响 |
| |
| 引用本文： | 秦兵,于文斌,何洪,李春梅,赵男男.稀土Yb对AZ91镁合金铸态及时效态组织和性能的影响[J].特种铸造及有色合金,2009,29(12). |
| |
| 作者姓名： | 秦兵 于文斌 何洪 李春梅 赵男男 |
| |
| 作者单位： | 西南大学材料科学与工程学院 |
| |
| 基金项目： | 重庆市重点科技攻关项目，西南大学研究生重点课程建设基金项目 |
| |
| 摘 要： | 采用金相观察、X射线衍射和硬度测试等方法,研究了稀土Yb对AZ91镁合金铸态及热处理态组织和性能的影响.结果表明,添加1%的Yb可细化AZ91合金铸态组织,有效抑制β-Mg_(17)Al_(12)相的生长,并使β相由网状变为断续分布.XRD分析表明,合金中出现新相Al_(11)Yb_3,使合金硬度增加.添加Yb使AZ91合金固溶处理后的残余化合物增加,尽管对时效峰值影响不大,但可推迟180 ℃时效峰值和延缓过时效的出现.
|
| 关 键 词： | 镁合金 镱 热处理 金相组织 维氏硬度 |
Effects of Rare Earth Yb on Microstructure and Properties of As-cast and Aged AZ91 Alloys |
| |
| Qin Bing,Yu Wenbin,He Hong,Li Chunmei,Zhao Nannan.Effects of Rare Earth Yb on Microstructure and Properties of As-cast and Aged AZ91 Alloys[J].Special Casting & Nonferrous Alloys,2009,29(12). |
| |
| Authors: | Qin Bing Yu Wenbin He Hong Li Chunmei Zhao Nannan |
| |
| Abstract: | Effects of rare earth ytterbium (Yb) on microstructure and properties of as-cast and aged AZ91 magnesium alloy were investigated by OM (optical microscope), XRD (X-ray diffraction) and hardness testing. It is found that 1% Yb addition can refine as-cast structure of AZ91 alloy and effectively restrain the growth of β-Mg_(17)Al_(12) phase with the transformation from net-work structure into discontinuous ones. The hardness of the alloy is increased as a result of creation of Al_(11)Yb_3 phase by XRD analysis. Residual second phase is increased with Yb addition after solution treatment, which can postpone the appearance of peak hardness in the aging curves at 180℃ and delay the occurrence of over-aging process in spite of the value of peak hardness is only slightly changed. |
| |
| Keywords: | Magnesium Alloy Yb Heat Treatment Microstructure Vickers Hardness |
| 本文献已被 万方数据 等数据库收录！ |
|
