布里奇曼定向凝固Ni-12%Si过共晶的弹性模量与断裂韧性  

Elastic Modulus and Fracture Toughness of Bridgman Directionally Solidified Ni-12%Si Hypereutectic

作　　者：卢百平 崔春娟[2,3] 田露露 问亚岗[2] 王佩 LU Baiping;CUI Chunjuan;TIAN Lulu;WEN Yagang;WANG Pei(National Defense Key Discipline Laboratory of Light Alloy Processing Science and Technology,Nanchang Hangkong University,Nanchang 330063;School of Metallurgical Engineering,Xi'an University of Architecture and Technology,Xi'an 710055;Shaanxi Engineering Technology Research Center for Wear-resisting Materials,Xi'an 710055)

机构地区：[1]南昌航空大学轻合金加工科学与技术国防重点学科实验室,南昌330063 [2]西安建筑科技大学冶金工程学院,西安710055 [3]陕西省耐磨材料工程技术研究中心,西安710055

出　　处：《材料导报》2019年第8期1383-1388,共6页Materials Reports

基　　金：国家自然科学基金(51201121);南昌航空大学轻合金加工科学与技术国防重点学科实验室开放课题(gf201601001);2015陕西省留学人员科技活动择优资助项目;陕西省耐磨材料工程技术研究中心专项资金项目(2016NMZX03)~~

摘　　要：本研究采用第一性原理计算了Ni_3Si金属间化合物的弹性模量,并用Ipp6.0图像分析软件对不同凝固速率的Ni-12%Si(质量分数)过共晶定向凝固组织中α-Ni相的体积分数进行了定量分析。根据复合材料的混合法则预测了不同凝固速率的Ni-12%Si过共晶的塑性。此外,采用三点弯曲法研究了不同凝固速率的Ni-12%Si过共晶的断裂韧性,并分析了断口形貌以及断裂机理。In this study,the elastic modulus of the Ni 3Si intermetallic compound was calculated by the first principles,and the volume fractions ofα-Ni phase in the Bridgman directionally solidified Ni-12%Si(mass fraction)hypereutectic at different solidification rates were analyzed by the Ipp 6.0 image analysis software.The plasticities of the Ni-12%Si hypereutectic at different solidification rates were predicted according to the mixing rule of composite materials.Moreover,the fracture toughnesses of the Ni-12%Si hypereutectic at different solidification rates were studied by three-point bending method,and the fracture morphology and the fracture mechanism were studied as well.

关 键 词：定向凝固 第一性原理 过共晶 断裂韧性 三点弯曲 

分 类 号：TG244.3[金属学及工艺—铸造]