Ti和Al的交互作用对Nb-Ti-Si-Al合金微观组织和力学性能的影响（英文）  

Effect of Ti and Al Interaction on Microstructures and Mechanical Properties of the Nb-Ti-Si-Al Alloys

作　　者：孙志平[1] 郭金明[2] 张晨[3] 郭喜平[4] 田晓东[1] 

机构地区：[1]长安大学,陕西西安710064 [2]西北有色金属研究院,陕西西安710016 [3]北京百慕航材高科技股份有限公司,北京100095 [4]西北工业大学凝固技术国家重点实验室,陕西西安710072

出　　处：《稀有金属材料与工程》2016年第7期1678-1682,共5页Rare Metal Materials and Engineering

基　　金：National Nature Science Foundation of China(51401032);the Fundamental Research Funds for Central Universities from Chang’an University(0009-2014G1311089)

摘　　要：研究高Al含量对合金中Nb-Al金属间化合物形成的影响及2个高Al含量的Nb-Ti-Si-Al合金(A2:Nb-18Ti-14Si-9Al、A4:Nb-21Ti-14Si-9Al)的微观组织和力学性能,其中设计A4合金是为了分析Ti含量变化的影响。结果表明:A2合金由(Nb)、Nb_5Si_3和Nb_3Al_3相组成,而A4合金由(Nb)和Nb_5Si_32相组成。A2和A4合金的室温断裂韧性分别为11.1和10.9 MPa·m^(1/2)。同时对2个合金进行微压痕测试,以表征合金在微观尺度的力学性能。Nb-Si based alloys show great promise to surpass currently advanced Ni-base superalloys due to their low densities and high melting points.Both Ti and Al are beneficial alloying elements for Nb-Si based alloys.In literatures,a small amount（≤ 3 at%） of Al can be frequently examined,while Nb aluminides are usually not formed in this case.Since Nb_3 Al and Nb_2 Al have good strength and creep properties,Nb Al_3 is also a candidate hot-section material;however the study of Nb-Si alloys with these possible Nb aluminides is lacking,so we focus our efforts on whether Nb aluminide is formed or not by adding more Al in the as-cast Nb-Ti-Si alloys.The microstructures and the mechanical properties of two Nb-Ti-Si-Al alloys（A2：Nb-18Ti-14Si-9Al,A4：Nb-21Ti-14Si-9Al） with higher Al content were studied in the present work.A4 alloy was designed to examine the alloying effect of more Ti.Results show that A2 alloy consists of（Nb）,Nb_5Si_3 and Nb_3 Al,while the A4 alloy is composed of（Nb） and Nb_5Si_3.The room temperature fracture toughnesses of A2 alloy and A4 alloy are 11.1 and 10.9 MPa·m^1/2,respectively.Moreover,the microindention tests were conducted to characterize the micro scale mechanical properties of these Nb-Ti-Si-Al alloys.

关 键 词：Nb-Si基合金 Al合金化 微观组织 断裂韧性 微压痕测试 

分 类 号：TG146.416[一般工业技术—材料科学与工程]