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排序方式: 共有21条查询结果,搜索用时 15 毫秒
1.
本文以固态Cu-9wt%P合金为研究对象,研究了973 K时固态Cu-9wt%P在铝液内的溶解过程。通过静态溶解和水淬实验得到了保留溶解过程信息的凝固组织。采用ZEISS Axio Vert.A1光学金相显微镜、扫描电子显微镜(Scaning electron microscope, SEM)对凝固组织进行了分析。研究发现固态Cu-9wt%P合金在铝液内溶解时,随着溶解时间的延长,固液界面上Cu-9wt%P合金一侧易形成单相Cu3P,固液界面前沿富集有颗粒和层状的AlP。总结了固态Cu-9wt%P合金在铝熔体的溶解过程,揭示了溶解速度慢的根本原因。。  相似文献   
2.
P modification has been widely used in Al-Si piston industry, but trace of Ca element has great influence on the P modification efficiency. In this work, it is found that primary Si can be heterogeneously nucleated by AlP in near eutectic Al-12.6Si alloy, but Ca element may destroy the P modification efficiency, whereas the addition of B can recover the P modification efficiency in near eutectic Al-12.6Si alloy with high Ca containing. The microstructure transformation was related to the reaction of Ca, B, and AlP. According to the thermodynamic calculation, Ca may react with AlP and form Ca3P2 compound in Al-Si alloy, whereas, when B was added into the melt, AlP could be reformed. The reaction of Ca, B, and AlP can be shown as follows: 2AlP +3Ca→Ca3P2+2Al; Ca3P2+18B+2Al→3CaB6+2AlP. In addition, with B added into the Al-12.6Si alloy with Ca and P addition, the mechanical properties were improved compared with single Ca and/or P addition.  相似文献   
3.
Three morphologies of AlP, i.e. block, flake and dendrite, have been found in Al–Cu–P master alloys fabricated under different conditions. When Al–Cu–P master alloy with flaky AlP is used to refine hypereutectic Al–Si alloy, the morphology of AlP particles located in the center of the primary silicon is significantly different from the flaky ones added through the master alloy; adding blocky AlP into the melt, differences also exist in the morphology of AlP with different fabrication parameters. It is manifested that the AlP substrates re-form from the melt after partial disassociation and dissolution of the previously added AlP particles, which is a necessary part of the refinement process of hypereutectic Al–Si alloys.  相似文献   
4.
长期使用AIP熏蒸,加之其它因素使得储粮害虫对PH,产生较强抗药性,为此,使用溴甲烷进行熏蒸,杀虫效果明显,为粮食保防积累了一定经验。  相似文献   
5.
Mg-8Zn-4Al-1Si-0.3Mn-xAlP合金的显微组织及性能   总被引:8,自引:0,他引:8  
研究了AlP对Mg2Si相及其基体组织的细化效果和机理.结果表明:AlP能够作为Mg2Si初生相的异质核心,促使其由汉字形变为颗粒状,并且促进τ(Mg32(Al,Zn)49)相的析出,而抑制ψ(Al2Mg5Zn2)相的析出,同时基体组织也得到显著细化,不仅改善了合金的室温性能,而且也改善了高温(150℃)性能.  相似文献   
6.
张福甲  刘凤敏 《半导体光电》1997,18(6):375-379,425
介绍了间接跃迁的半导体AlP与GaP形成的超晶格,由于零折叠效应,实现了能带由间接带隙向直接带隙的转变,从而增加了带间的光跃迁几率,并推导了该几率的表达式。  相似文献   
7.
To obtain the finer primary silicon crystals, the proprietary Al-P master alloy was adopted to modify the eutectic Al-Si alloys and the most suitable modification process was made in the experiments. The SEM (Scanning Electron Microscope) and DSC (Differential Scanning Calorimeter) analysis indicate that the Al-P modifier has more advantages over Cu-P and Fe-P modifier in easily addition, no elemental alteration and less undercooling of primary silicon′s solidification, which suggests the Al-P master alloy is an effective modifier of eutectic Al-Si alloys.  相似文献   
8.
To obtain the finer primary silicon crystals, the proprietary Al-P master alloy was adopted to modify the eutectic Al-Si alloys and the most suitable modification process was made in the experiments. The SEM (Scanning Electron Microscope) and DSC (Differential Scanning Calorimeter) analysis indicate that the Al-P modifier has more advantages over Cu-P and Fe-P modifier in easily addition, no elemental alteration and less undercooling of primary silicon's solidification, which suggests the Al-P master alloy is an effective modifier of eutectic Al-Si alloys.  相似文献   
9.
10.
铝硅合金晶粒细化剂Al-Ti-C-P的研制   总被引:1,自引:0,他引:1  
采用自蔓延+熔铸法制备了Al-Ti—C-P晶粒细化剂,探讨了其对共晶铝硅合金的变质效果。通过扫描电镜(SEM)、光学显微镜(OM)、能谱分析(EDS)和X射线衍射仪(XRD)等手段,研究了Al—Ti—C—P晶粒细化刺的显微组织。结果表明:Al—Ti—C—P晶粒细化剂的主要相组成为TiAl3、TiC、AlP,对共晶铝硅合金具有优良的变质效果。晶粒细化剂中的TiAl2和TiC颗粒促进了AlP时共晶铝硅合金的变质效果。  相似文献   
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