基于动态材料模型(DMM),建立了Ti2AlNb基合金(Ti-22A1-25Nb)在温度940℃~1060℃,应变速率0.001 s-1~10s-1范围内的加工图,并利用该图分析了合金的高温变形特性.结果发现:在温度940℃~970℃,应变速率0.4 s-1~10 s-1和温度970℃~1060℃,应变速率1 s-1~10 s-1范围为流动失稳区,前者范围内主要发生绝热剪切变形和45°角剪切开裂,功率耗散率达到最小值;后者区域内以局部塑性流动和纵向开裂为主,功率耗散率小于33%.热加工图的其余部分为塑性加工的"安全区",主要发生再结晶.在温度940℃~970℃,应变速率0.001 s-1~0.4 s-1范围,以a2/O相板条球化为主;在温度970℃~1030℃,应变速率0.001 s-1~1 s-1范围,功率耗散率为35%~45%,呈现连续再结晶特征.在温度1030℃~1060℃,应变速率0.001 s-1~0.1 s-1范围,功率耗散率为45%~66%,达最大值,发生连续再结晶晶粒长大.
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