本文主要研究内容
作者杨啸雨（2019）在《氢化钛制备Al-Ti-C-Ce及其细化行为研究》一文中研究指出：铝合金作为当今社会中常见的金属材料之一,被广泛的应用在交通、建筑、航空航天、航海、电力、医疗、装饰等各个领域。随着各行业的稳步发展,对铝合金导电、导热、耐腐蚀、比强度、韧性等性能有着更高更严格的要求。提高铝合金功用的办法有很多,细化铝合金晶粒可以提升铝合金强度和塑性,从而改善铝材性能。将晶粒细化剂掺入铝合金熔炼,使得铝熔体在凝固过程中获得足够的异质晶核,从而细化金属晶粒的尺寸来提升铝材性能已经成为如今工业生产中最为普遍且经济实用的方法。目前在工业铝合金熔炼中使用率最高的晶粒细化剂是Al-Ti-B、Al-Ti-C,然而将Al-Ti-B添加到铝液之后TiB2粒子容易被团聚,易被Cr、Zr、Mn等元素毒化从而使得细化剂失去作用。自从Al-Ti-C细化剂被成功制备出之后,弥补了Al-Ti-B细化剂在工业生产中的缺陷,使得细化剂的应用范围得到提升。然而Al-Ti-C细化剂在制备过程中存在碳源与铝液润湿性极差,进入铝液的碳源很难与铝液中的Ti原子结合产生足够的TiC粒子。因此Al-Ti-C细化剂在工业生产中也遭到极大的限制。本文通过在Al-Ti-C制备过程中引入稀土元素铈来改善碳源与铝液的润湿性,从而提高TiC粒子的形成率。在Al-Ti-C细化剂在工业制备过程中通常是利用钛氟酸钾来引入Ti源,熔炼温度一般在1200℃1300℃,高温不仅会造成氟尘污染,而且会使合金氧化,烧损严重。本文在制备Al-Ti-C细化剂中利用氢化钛代替钛氟酸钾,制备过程中最高温度不超过950℃,避免了高温造成的合金烧损,更杜绝了氟尘造成的环境污染。本文制备了Al-3Ti-0.2C-3Ce与Al-3Ti-0.2C-6Ce两种配比的Al-Ti-C-Ce晶粒细化剂,与Al-3Ti-0.2C细化剂的第二相形貌、相成分以及相分布情况进行对比分析,从而探讨在制备Al-Ti-C-Ce过程中Ce元素的加入量对细化剂内部第二相的形成的影响和Ce元素在细化剂中的运动情况。实验制备的Al-3Ti-0.2C中间合金由Al、TiAl3、TiC这三种相构成。Al-3Ti-0.2C中间合金内部有大量的针状、细条状与块状的第二相,主要分布在晶界与晶内上。并有少量的团絮状第二相分散在基体中。从线扫描结果可知沿晶界和晶体中晶界未发现Ti和C有异常浓度和偏析,相反它们在整个晶体边界和晶体中均匀分布。Al-3Ti-0.2C中间合金制备过程中TiH2和石墨作为Ti源和C源。TiH2在铝液中受热分解放出Ti原子,Ti原子与熔体中的石墨结合成TiC粒子,与Al原子结合生成TiAl3。纯铝的晶粒尺寸随细化剂添加量增加而不断降低,当细化剂添加量在0.01%0.05%时,样品晶粒尺寸随细化剂添加量增多,细化效果最为明显,当细化剂添加量达到0.05%时细化剂细化效果达到饱和,之后曲线变平滑,晶粒尺寸与细化剂添加量增加变化并不明显。Al-3Ti-0.2C中间合金细化剂最佳细化添加量为0.05%。所制备的Al-3Ti-0.2C-6Ce母合金由α（Al）、（TiC）、（TiAl3）、(Ti2Al20Ce)相组成。Al-3Ti-0.2C-6Ce铸样晶界为连续的共晶组织,晶内分布大量粗大第二相组织,晶界共晶和晶内第二相中均含有Ti2Al20Ce相。部分大颗粒第二相组织为复合结构晶粒,第二相颗粒内部存在颜色较深的TiC、Ti2Al20Ce的包晶组织。TiC粒子主要分布在晶内,少量分布在境界处,以团簇的形式存在。Ce元素的加入提高了石墨与铝液的润湿性,促进TiC粒子的形成。Al-3Ti-0.2C-6Ce中间合金第二相粒子中,元素C的分布相对均匀,粒子内部的C、Al分布相对较低,Ti、Ce含量分布相对较高,特别是Ce的分布显著高于粒子外部区域;在第二相内部黑色区域,C含量极高,而Ti、Ce含量较低。在细化实验中,纯铝的晶粒尺寸随细化剂添加而不断降低,当细化剂添加量在0.01%0.03%时,样品晶粒尺寸随细化剂添加量增多,细化效果最为明显,当细化剂添加量达到0.03%时细化剂细化内部有效形核核心已经达到饱和,之后曲线变平滑,晶粒尺寸与细化剂添加量增加变化并不明显。Ce原子可以降低Ti3Al相表面表面自由能,极大延长细化反应时间。Al-3Ti-0.2C-6Ce中间合金凝固过程中在晶内第二相是由Ti、Ce、Al在TiC粒子团表面发生包晶反应形成的,晶界第二相是Ti、Ce、TiC被当做杂质原子排挤到晶界处发生包晶反应形成的。Ce元素加入可以解决石墨与铝熔体的润湿的问题,提升了TiC粒子的含量,而TiC粒子作为铝熔体中的形核核心,增加了形核数量,Ce元素不仅可以促进TiC粒子的生成,也可以提升细化剂的抗衰性Al-Ti-C-Ce中间合金之所以细化能力高于Al-Ti-C中间合金,不单单因为Ce原子的加入提升了TiC粒子的含量,而且在细化过程中,Ce原子会富集在铝合金晶界处抑制铝合金晶粒继续长大。
Abstract
lv ge jin zuo wei dang jin she hui zhong chang jian de jin shu cai liao zhi yi ,bei an fan de ying yong zai jiao tong 、jian zhu 、hang kong hang tian 、hang hai 、dian li 、yi liao 、zhuang shi deng ge ge ling yu 。sui zhao ge hang ye de wen bu fa zhan ,dui lv ge jin dao dian 、dao re 、nai fu shi 、bi jiang du 、ren xing deng xing neng you zhao geng gao geng yan ge de yao qiu 。di gao lv ge jin gong yong de ban fa you hen duo ,xi hua lv ge jin jing li ke yi di sheng lv ge jin jiang du he su xing ,cong er gai shan lv cai xing neng 。jiang jing li xi hua ji can ru lv ge jin rong lian ,shi de lv rong ti zai ning gu guo cheng zhong huo de zu gou de yi zhi jing he ,cong er xi hua jin shu jing li de che cun lai di sheng lv cai xing neng yi jing cheng wei ru jin gong ye sheng chan zhong zui wei pu bian ju jing ji shi yong de fang fa 。mu qian zai gong ye lv ge jin rong lian zhong shi yong lv zui gao de jing li xi hua ji shi Al-Ti-B、Al-Ti-C,ran er jiang Al-Ti-Btian jia dao lv ye zhi hou TiB2li zi rong yi bei tuan ju ,yi bei Cr、Zr、Mndeng yuan su du hua cong er shi de xi hua ji shi qu zuo yong 。zi cong Al-Ti-Cxi hua ji bei cheng gong zhi bei chu zhi hou ,mi bu le Al-Ti-Bxi hua ji zai gong ye sheng chan zhong de que xian ,shi de xi hua ji de ying yong fan wei de dao di sheng 。ran er Al-Ti-Cxi hua ji zai zhi bei guo cheng zhong cun zai tan yuan yu lv ye run shi xing ji cha ,jin ru lv ye de tan yuan hen nan yu lv ye zhong de Tiyuan zi jie ge chan sheng zu gou de TiCli zi 。yin ci Al-Ti-Cxi hua ji zai gong ye sheng chan zhong ye zao dao ji da de xian zhi 。ben wen tong guo zai Al-Ti-Czhi bei guo cheng zhong yin ru xi tu yuan su shi lai gai shan tan yuan yu lv ye de run shi xing ,cong er di gao TiCli zi de xing cheng lv 。zai Al-Ti-Cxi hua ji zai gong ye zhi bei guo cheng zhong tong chang shi li yong tai fu suan jia lai yin ru Tiyuan ,rong lian wen du yi ban zai 1200℃1300℃,gao wen bu jin hui zao cheng fu chen wu ran ,er ju hui shi ge jin yang hua ,shao sun yan chong 。ben wen zai zhi bei Al-Ti-Cxi hua ji zhong li yong qing hua tai dai ti tai fu suan jia ,zhi bei guo cheng zhong zui gao wen du bu chao guo 950℃,bi mian le gao wen zao cheng de ge jin shao sun ,geng du jue le fu chen zao cheng de huan jing wu ran 。ben wen zhi bei le Al-3Ti-0.2C-3Ceyu Al-3Ti-0.2C-6Celiang chong pei bi de Al-Ti-C-Cejing li xi hua ji ,yu Al-3Ti-0.2Cxi hua ji de di er xiang xing mao 、xiang cheng fen yi ji xiang fen bu qing kuang jin hang dui bi fen xi ,cong er tan tao zai zhi bei Al-Ti-C-Ceguo cheng zhong Ceyuan su de jia ru liang dui xi hua ji nei bu di er xiang de xing cheng de ying xiang he Ceyuan su zai xi hua ji zhong de yun dong qing kuang 。shi yan zhi bei de Al-3Ti-0.2Czhong jian ge jin you Al、TiAl3、TiCzhe san chong xiang gou cheng 。Al-3Ti-0.2Czhong jian ge jin nei bu you da liang de zhen zhuang 、xi tiao zhuang yu kuai zhuang de di er xiang ,zhu yao fen bu zai jing jie yu jing nei shang 。bing you shao liang de tuan xu zhuang di er xiang fen san zai ji ti zhong 。cong xian sao miao jie guo ke zhi yan jing jie he jing ti zhong jing jie wei fa xian Tihe Cyou yi chang nong du he pian xi ,xiang fan ta men zai zheng ge jing ti bian jie he jing ti zhong jun yun fen bu 。Al-3Ti-0.2Czhong jian ge jin zhi bei guo cheng zhong TiH2he dan mo zuo wei Tiyuan he Cyuan 。TiH2zai lv ye zhong shou re fen jie fang chu Tiyuan zi ,Tiyuan zi yu rong ti zhong de dan mo jie ge cheng TiCli zi ,yu Alyuan zi jie ge sheng cheng TiAl3。chun lv de jing li che cun sui xi hua ji tian jia liang zeng jia er bu duan jiang di ,dang xi hua ji tian jia liang zai 0.01%0.05%shi ,yang pin jing li che cun sui xi hua ji tian jia liang zeng duo ,xi hua xiao guo zui wei ming xian ,dang xi hua ji tian jia liang da dao 0.05%shi xi hua ji xi hua xiao guo da dao bao he ,zhi hou qu xian bian ping hua ,jing li che cun yu xi hua ji tian jia liang zeng jia bian hua bing bu ming xian 。Al-3Ti-0.2Czhong jian ge jin xi hua ji zui jia xi hua tian jia liang wei 0.05%。suo zhi bei de Al-3Ti-0.2C-6Cemu ge jin you α（Al）、（TiC）、（TiAl3）、(Ti2Al20Ce)xiang zu cheng 。Al-3Ti-0.2C-6Cezhu yang jing jie wei lian xu de gong jing zu zhi ,jing nei fen bu da liang cu da di er xiang zu zhi ,jing jie gong jing he jing nei di er xiang zhong jun han you Ti2Al20Cexiang 。bu fen da ke li di er xiang zu zhi wei fu ge jie gou jing li ,di er xiang ke li nei bu cun zai yan se jiao shen de TiC、Ti2Al20Cede bao jing zu zhi 。TiCli zi zhu yao fen bu zai jing nei ,shao liang fen bu zai jing jie chu ,yi tuan cu de xing shi cun zai 。Ceyuan su de jia ru di gao le dan mo yu lv ye de run shi xing ,cu jin TiCli zi de xing cheng 。Al-3Ti-0.2C-6Cezhong jian ge jin di er xiang li zi zhong ,yuan su Cde fen bu xiang dui jun yun ,li zi nei bu de C、Alfen bu xiang dui jiao di ,Ti、Cehan liang fen bu xiang dui jiao gao ,te bie shi Cede fen bu xian zhe gao yu li zi wai bu ou yu ;zai di er xiang nei bu hei se ou yu ,Chan liang ji gao ,er Ti、Cehan liang jiao di 。zai xi hua shi yan zhong ,chun lv de jing li che cun sui xi hua ji tian jia er bu duan jiang di ,dang xi hua ji tian jia liang zai 0.01%0.03%shi ,yang pin jing li che cun sui xi hua ji tian jia liang zeng duo ,xi hua xiao guo zui wei ming xian ,dang xi hua ji tian jia liang da dao 0.03%shi xi hua ji xi hua nei bu you xiao xing he he xin yi jing da dao bao he ,zhi hou qu xian bian ping hua ,jing li che cun yu xi hua ji tian jia liang zeng jia bian hua bing bu ming xian 。Ceyuan zi ke yi jiang di Ti3Alxiang biao mian biao mian zi you neng ,ji da yan chang xi hua fan ying shi jian 。Al-3Ti-0.2C-6Cezhong jian ge jin ning gu guo cheng zhong zai jing nei di er xiang shi you Ti、Ce、Alzai TiCli zi tuan biao mian fa sheng bao jing fan ying xing cheng de ,jing jie di er xiang shi Ti、Ce、TiCbei dang zuo za zhi yuan zi pai ji dao jing jie chu fa sheng bao jing fan ying xing cheng de 。Ceyuan su jia ru ke yi jie jue dan mo yu lv rong ti de run shi de wen ti ,di sheng le TiCli zi de han liang ,er TiCli zi zuo wei lv rong ti zhong de xing he he xin ,zeng jia le xing he shu liang ,Ceyuan su bu jin ke yi cu jin TiCli zi de sheng cheng ,ye ke yi di sheng xi hua ji de kang cui xing Al-Ti-C-Cezhong jian ge jin zhi suo yi xi hua neng li gao yu Al-Ti-Czhong jian ge jin ,bu chan chan yin wei Ceyuan zi de jia ru di sheng le TiCli zi de han liang ,er ju zai xi hua guo cheng zhong ,Ceyuan zi hui fu ji zai lv ge jin jing jie chu yi zhi lv ge jin jing li ji xu chang da 。
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论文作者分别是来自新疆大学的杨啸雨，发表于刊物新疆大学2019-07-23论文，是一篇关于晶粒细化剂论文,晶粒细化论文,铝熔体论文,第二相论文,包晶反应论文,新疆大学2019-07-23论文的文章。本文可供学术参考使用，各位学者可以免费参考阅读下载，文章观点不代表本站观点，资料来自新疆大学2019-07-23论文网站，若本站收录的文献无意侵犯了您的著作版权，请联系我们删除。