研究和评论:材料科学杂雷竞技苹果下载志》上
菜单ISSN: 2321 - 6212
ISSN: 2321 - 6212
征服者伊克巴尔
巴基斯坦工程和应用科学学院,巴基斯坦
海报和接受抽象:启J垫。Sci >
DOI:10.4172 / 2321 - 6212 c8 - 036
发展纳米晶体- 25%钨铼合金强化与碳化铪是一项具有挑战性的任务,因为这些合金很难通过常规方法合成。的问题可以解决这些困难的合金元素通过使用一个独特的结合了机械合金化和火花等离子烧结(SPS)技术通过粉末冶金的路线。铼添加ductile-to-brittle转变温度较低,增加钨的再结晶温度。SPS快速整合技术,防止晶粒生长。这些工具材料可以承受高温和恶劣的条件中加入应用程序如搅拌摩擦焊(FSW)钢和钛合金。焊是一个绿色的过程不排放烟和有毒气体的过程。烧结是在1500 - 1800摄氏度之间。机械合金和火花等离子烧结合金和复合光学显微镜、场发射扫描电镜(FESEM)和x射线衍射。巩固标本显微组织调查的最初是由传统的腐蚀和金相学技术。光学显微图显示没有明显的晶界腐蚀的迹象。 Spark plasma sintered samples were further electrochemically etched in one molar concentrated solution of NaOH. The positive terminal of the low voltage direct current power supply was connected to the sample. The negative terminal was connected to a steel plate acting as a cathode. Both electrodes were placed in the tank face to face with a gap of 6 to 10 centimeters between them. The voltage was kept constant at 5 volts during the etching process. The sample was etched for a short time interval from 1 to 5 seconds and microstructural analysis was conducted after each etching step. The results of the FESEM images confirm microstructural revelation of these difficult to etch alloy and composites.
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