采用粉末冶金法制备出Ti-35%Nb泡沫合金,并对该泡沫合金的显微组织,静载力学行为和疲劳特性进行了研究.所制备的泡沫合金组织主要由β-Ti组成,孔洞分布均匀,开孔率高,其压缩曲线表现出典型的开孔泡沫材料的变形特征,孔隙率为66%的TiNb泡沫合金的平台应力约为56 MPa,其疲劳强度是15.1 MPa(疲劳寿命N=1×107).疲劳断口分析结果表明微孔和宏孔连接处是容易产生裂纹的地方,裂纹是以塑件疲劳裂纹扩展方式扩展,最终引起了单个孔壁的断裂,从而载荷传递给相邻的孔壁,加速了整个泡沫材料的整体断裂.
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